-
Notifications
You must be signed in to change notification settings - Fork 3
Expand file tree
/
Copy pathmarkdown-to-html.html
More file actions
1471 lines (1379 loc) · 85.5 KB
/
markdown-to-html.html
File metadata and controls
1471 lines (1379 loc) · 85.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Markdown to HTML: Self-Contained HTML and PDF Export | Secutils.dev</title>
<meta name="description" content="Free Markdown-to-HTML converter with live preview and syntax highlighting. Export self-contained HTML or print-ready PDFs with TOC, dark mode, embedded source. Browser-only, no signup.">
<meta name="robots" content="index, follow, max-image-preview:large">
<link rel="canonical" href="https://{{TOOLS_HOST}}/md-to-html">
<meta name="su-tool-path" content="/md-to-html">
<meta name="su-tool-name" content="Markdown to HTML">
<meta name="su-tool-description" content="Convert Markdown to self-contained HTML or print-ready PDFs with live preview and syntax highlighting. Shareable URL state, no signup.">
<meta name="su-tool-promote" content="true">
<meta property="og:type" content="website">
<meta property="og:site_name" content="Secutils.dev">
<meta property="og:title" content="Markdown to HTML: Self-Contained HTML & PDF Export">
<meta property="og:description" content="Free Markdown-to-HTML converter. Live preview with syntax highlighting, self-contained HTML or print-ready PDFs, TOC, dark mode. Browser-only.">
<meta property="og:url" content="https://{{TOOLS_HOST}}/md-to-html">
<meta property="og:image" content="https://secutils.dev/docs/img/og/og-md-to-html.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Markdown to HTML on Secutils.dev: live preview, self-contained HTML, and PDF export.">
<meta property="og:locale" content="en_US">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Markdown to HTML: Self-Contained HTML & PDF Export">
<meta name="twitter:description" content="Free Markdown-to-HTML converter. Live preview, self-contained HTML or print-ready PDFs with TOC and dark mode. No signup.">
<meta name="twitter:image" content="https://secutils.dev/docs/img/og/og-md-to-html.png">
<script type="application/ld+json">{"@context":"https://schema.org","@type":"WebApplication","name":"Markdown to HTML","url":"https://{{TOOLS_HOST}}/md-to-html","applicationCategory":"DeveloperApplication","operatingSystem":"Any","browserRequirements":"Requires JavaScript","isAccessibleForFree":true,"offers":{"@type":"Offer","price":"0","priceCurrency":"USD"},"publisher":{"@type":"Organization","name":"Secutils.dev","url":"https://secutils.dev"},"sameAs":"https://github.com/secutils-dev/secutils/blob/main/dev/tools/markdown-to-html.html","description":"Free Markdown-to-HTML converter with live preview and syntax highlighting. Export self-contained HTML or print-ready PDFs with table of contents, dark mode, and embedded source. Browser-only, no signup."}</script>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@300..700&family=Roboto+Mono:wght@400..700&display=swap" rel="stylesheet">
<!-- Privacy-friendly analytics by Plausible -->
<script defer src="https://tools.secutils.dev/js/script.js"></script>
<script>
window.plausible = window.plausible || function () { (plausible.q = plausible.q || []).push(arguments) };
plausible.init = plausible.init || function (i) { plausible.o = i || {} };
plausible.init();
</script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css">
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root, [data-theme="dark"] {
--bg: #141519; --surface: #1d1e24; --surface-hover: #2c2d33;
--border: #343741; --text: #dfe5ef; --text-muted: #98a2b3;
--primary: #fed047; --primary-hover: #fdc615;
--primary-text: #642340;
--primary-glow: rgba(254,208,71,0.10);
--accent: #642340;
--badge-bg: #2B394F; --badge-text: #98A8C3;
--radius: 12px;
--font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
--mono: 'Roboto Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
--code-bg: #16171c;
--bq-bg: #1c1d22; --bq-border: #fed047; --bq-text: #c9b870;
}
[data-theme="light"] {
--bg: #f5f7fa; --surface: #ffffff; --surface-hover: #f1f3f5;
--border: #d3dae6; --text: #343741; --text-muted: #69707d;
--primary: #fed047; --primary-hover: #fdc615;
--primary-text: #642340;
--primary-glow: rgba(254,208,71,0.15);
--accent: #642340;
--badge-bg: #E3E8F2; --badge-text: #505F79;
--code-bg: #f6f8fa;
--bq-bg: #fef9e7; --bq-border: #642340; --bq-text: #4a3a2a;
}
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; transition: background .25s, color .25s; }
header { display: flex; align-items: center; justify-content: space-between; padding: 0 16px; height: 48px; background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; transition: background .25s, border-color .25s; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-svg { flex-shrink: 0; }
.logo-svg .logo-text-fill { fill: var(--text); }
.logo-badge { display: inline-flex; align-items: center; padding: 4px 16px; border-radius: 4px; border: none; background: var(--badge-bg); color: var(--badge-text); font-size: 12px; font-weight: 450; line-height: 16px; white-space: nowrap; }
.header-right { display: flex; gap: 8px; align-items: center; }
/* `height` pins the outer size so `.btn-primary`'s `font-weight: 600` doesn't
render 1-2 px taller than the regular variant via expanded bold strut
metrics. See dev/tools/AGENTS.md -> "Buttons". */
.btn { padding: 7px 14px; height: 29px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font: 13px/1 var(--font); cursor: pointer; transition: all .15s; display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.btn:hover:not(:disabled) { background: var(--surface-hover); border-color: var(--text-muted); }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn-primary { background: var(--primary); border-color: var(--primary-text); color: var(--primary-text); font-weight: 500; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-sm { padding: 5px 10px; height: 24px; font-size: 12px; }
.theme-toggle { width: 36px; height: 36px; padding: 0; display: flex; align-items: center; justify-content: center; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all .2s; }
.theme-toggle:hover { background: var(--surface-hover); color: var(--text); }
.theme-toggle svg { width: 16px; height: 16px; fill: currentColor; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
.skill-link { height: 36px; display: inline-flex; align-items: center; gap: 6px; padding: 0 12px; border: 1px solid var(--border); border-radius: 18px; background: var(--surface); color: var(--text-muted); font: 12px var(--font, system-ui), sans-serif; text-decoration: none; transition: all .15s; cursor: pointer; }
.skill-link:hover { color: var(--text); border-color: var(--text-muted); background: var(--surface-hover); }
.skill-link svg { width: 14px; height: 14px; fill: none; stroke: currentColor; }
.su-more-tools { margin: 8px 0 0; padding: 12px 18px; text-align: center; border: 1px solid rgba(254, 208, 71, 0.35); border-radius: 12px; background: rgba(254, 208, 71, 0.06); font: 13px/1.55 var(--font); color: var(--text); transition: border-color .25s, background-color .25s, color .25s; }
.su-more-tools p { margin: 0; }
.su-more-tools a { color: var(--primary); font-weight: 700; text-decoration: none; white-space: nowrap; }
.su-more-tools a:hover { color: var(--primary-hover); text-decoration: underline; }
@media (max-width: 600px) { .su-more-tools { padding: 12px 14px; } .su-more-tools a { white-space: normal; } }
.su-noscript { max-width: 720px; margin: 24px auto; padding: 16px; border: 1px solid var(--border); border-radius: 8px; font: 14px/1.5 var(--font, system-ui), sans-serif; background: var(--surface); color: var(--text); }
/* Two-pane layout */
main { flex: 1; padding: 24px 16px; display: flex; flex-direction: column; overflow: hidden; }
.grid { display: grid; grid-template-columns: 1fr 12px 1fr; gap: 0; flex: 1; min-height: 0; }
.panel { display: flex; flex-direction: column; min-height: 0; }
.panel-bar { display: flex; align-items: center; justify-content: space-between; padding: 0 0 8px; gap: 8px; height: 38px; box-sizing: content-box; flex-shrink: 0; }
.panel-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.panel-label { font-size: 13px; font-weight: 600; color: var(--text); }
.link-btn { border: none; background: none; font: 12px var(--font); color: var(--text-muted); cursor: pointer; padding: 2px 4px; transition: color .15s; }
.link-btn:hover { color: var(--text); }
.stats-text { font: 11px var(--mono); color: var(--text-muted); white-space: nowrap; }
.splitter { cursor: col-resize; background: transparent; position: relative; z-index: 1; }
.splitter::after { content: ''; position: absolute; top: 0; bottom: 0; left: 50%; width: 1px; background: var(--border); transition: width .15s, background .15s; transform: translateX(-50%); }
.splitter:hover::after, .splitter.active::after { width: 3px; background: var(--primary); border-radius: 2px; }
/* Editor pane (CodeMirror mounts inside #editorMount) */
#editorMount { flex: 1; min-height: 300px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); transition: border-color .15s, background .25s; }
#editorMount.dragover { border-color: var(--primary); background: var(--primary-glow); }
.cm-editor { height: 100%; font: 13px/1.6 var(--mono); }
.cm-editor.cm-focused { outline: none; }
.cm-scroller { font-family: var(--mono); }
.cm-content { padding: 8px 0; }
.cm-line { padding: 0 12px; }
.cm-gutters { background: var(--surface); border-right: 1px solid var(--border); color: var(--text-muted); }
.cm-activeLineGutter, .cm-activeLine { background: var(--surface-hover) !important; }
.cm-cursor { border-left-color: var(--primary) !important; }
.cm-selectionBackground, .cm-content ::selection { background: rgba(254, 208, 71, 0.18) !important; }
[data-theme="dark"] .cm-editor { color: var(--text); }
[data-theme="light"] .cm-editor { color: var(--text); }
/* Markdown syntax token coloring (CodeMirror's @lezer/markdown class names) */
.tok-heading, .ͼ1 .tok-heading { color: #d2a8ff; font-weight: 600; }
[data-theme="light"] .tok-heading { color: #6f42c1; }
.tok-link { color: var(--primary); }
.tok-emphasis { font-style: italic; }
.tok-strong { font-weight: 700; color: var(--text); }
.tok-monospace { color: #ffa657; }
[data-theme="light"] .tok-monospace { color: #953800; }
.tok-list { color: var(--text-muted); }
.tok-quote { color: #c9b870; font-style: italic; }
[data-theme="light"] .tok-quote { color: #735c0f; }
/* Editor fallback (plain textarea when CodeMirror CDN fails) */
.editor-fallback { width: 100%; height: 100%; padding: 14px; font: 13px/1.6 var(--mono); background: var(--surface); color: var(--text); border: none; outline: none; resize: none; }
/* View tabs (Preview / HTML) */
.view-tabs { display: inline-flex; gap: 2px; padding: 2px; background: var(--surface); border: 1px solid var(--border); border-radius: 6px; }
.view-tab { padding: 3px 10px; border: none; background: transparent; color: var(--text-muted); font: 12px/1 var(--font); font-weight: 500; cursor: pointer; border-radius: 4px; transition: all .15s; }
.view-tab:hover { color: var(--text); }
.view-tab.active { background: var(--surface-hover); color: var(--text); font-weight: 600; }
/* Icon-only utility button (e.g. fullscreen toggle) */
.icon-btn { padding: 4px; border: none; background: none; color: var(--text-muted); cursor: pointer; border-radius: 4px; transition: all .15s; display: inline-flex; align-items: center; justify-content: center; }
.icon-btn:hover { color: var(--text); background: var(--surface-hover); }
.icon-btn svg { width: 16px; height: 16px; }
/* Fullscreen the right (preview) pane */
#previewPane:fullscreen { background: var(--bg); padding: 16px; display: flex; flex-direction: column; overflow: hidden; }
#previewPane:fullscreen .output-panel { flex: 1; min-height: 0; }
/* Preview pane */
.output-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); display: flex; flex-direction: column; overflow: hidden; flex: 1; min-height: 300px; transition: background .25s, border-color .25s; }
.output-scroll { flex: 1; overflow-y: auto; padding: 28px 32px; }
.html-preview-frame { flex: 1; width: 100%; border: none; background: var(--surface); display: block; min-height: 0; }
.html-preview-frame[hidden] { display: none; }
.preview-article { width: 100%; max-width: 760px; margin: 0 auto; line-height: 1.7; font-size: 15px; color: var(--text); }
.preview-article h1, .preview-article h2, .preview-article h3, .preview-article h4, .preview-article h5, .preview-article h6 { color: var(--text); line-height: 1.3; margin-top: 1.4em; margin-bottom: .5em; }
.preview-article h1:first-child, .preview-article h2:first-child, .preview-article h3:first-child { margin-top: 0; }
.preview-article h1 { font-size: 1.8em; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.preview-article h2 { font-size: 1.4em; border-bottom: 1px solid var(--border); padding-bottom: .25em; }
.preview-article h3 { font-size: 1.2em; }
.preview-article h4 { font-size: 1.05em; }
.preview-article p { margin: 0 0 14px; }
.preview-article a { color: var(--primary); text-decoration: none; }
.preview-article a:hover { text-decoration: underline; }
.preview-article img { max-width: 100%; border-radius: 8px; margin: 4px 0; }
.preview-article blockquote { border-left: 4px solid var(--bq-border); margin: 0 0 14px; padding: 8px 16px; background: var(--bq-bg); border-radius: 0 8px 8px 0; color: var(--bq-text); }
.preview-article blockquote p:last-child { margin-bottom: 0; }
.preview-article pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow-x: auto; margin: 0 0 14px; font-size: 13px; line-height: 1.5; position: relative; }
.preview-article pre[data-lang] { padding-top: 36px; }
.preview-article pre[data-lang]::before { content: attr(data-lang); position: absolute; top: 0; left: 0; right: 0; padding: 6px 12px; font: 600 10px/1 var(--font); color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; border-bottom: 1px solid var(--border); background: var(--surface-hover); border-radius: 8px 8px 0 0; }
.preview-article code { font-family: var(--mono); }
.preview-article :not(pre) > code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: .88em; border: 1px solid var(--border); }
.preview-article table { width: 100%; border-collapse: collapse; margin: 0 0 14px; font-size: 14px; }
.preview-article th, .preview-article td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
.preview-article th { background: var(--surface-hover); font-weight: 600; color: var(--text); }
.preview-article tr:nth-child(even) { background: var(--surface-hover); }
.preview-article ul, .preview-article ol { margin: 0 0 14px; padding-left: 26px; }
.preview-article li { margin: 3px 0; }
.preview-article li > ul, .preview-article li > ol { margin-bottom: 0; }
.preview-article hr { border: none; height: 2px; background: var(--border); margin: 24px 0; }
.preview-article li input[type="checkbox"] { margin-right: 6px; }
/* Empty state inside preview */
.empty-state { height: 100%; min-height: 240px; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); opacity: 0.65; padding: 40px; text-align: center; }
.empty-state-icon { width: 56px; height: 56px; margin-bottom: 16px; border-radius: 14px; background: var(--surface-hover); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; color: var(--text-muted); }
.empty-state-icon svg { width: 28px; height: 28px; stroke: currentColor; fill: none; }
.empty-state-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.empty-state-sub { font-size: 12px; }
/* Export dropdown */
.export-anchor { position: relative; display: inline-flex; }
.export-anchor .chevron { margin-left: 2px; transition: transform .15s; }
.export-anchor[data-open="true"] .chevron { transform: rotate(180deg); }
.export-menu { position: absolute; top: calc(100% + 6px); right: 0; min-width: 110px; padding: 6px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.35); z-index: 60; display: flex; flex-direction: column; gap: 2px; }
.export-menu[hidden] { display: none; }
.export-item { padding: 7px 14px; border: none; background: transparent; color: var(--text); font: 13px var(--font); font-weight: 500; cursor: pointer; border-radius: 6px; text-align: left; transition: background .15s; }
.export-item:hover, .export-item:focus-visible { background: var(--surface-hover); outline: none; }
/* Options popover */
.options-anchor { position: relative; display: inline-flex; }
.options-popover { position: absolute; top: calc(100% + 8px); right: 0; min-width: 260px; padding: 14px 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,0.35); z-index: 60; }
.options-popover h4 { font-size: 11px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 10px; }
.options-popover label { display: flex; align-items: flex-start; gap: 10px; padding: 6px 0; cursor: pointer; font-size: 13px; color: var(--text); line-height: 1.4; }
.options-popover input[type="checkbox"] { accent-color: var(--primary); cursor: pointer; margin-top: 2px; flex-shrink: 0; }
.options-popover .opt-desc { display: block; font-size: 11px; color: var(--text-muted); margin-top: 2px; }
/* Toast */
.toast { position: fixed; bottom: 20px; right: 20px; background: var(--surface); color: var(--text); padding: 10px 18px; border-radius: 8px; border: 1px solid var(--border); font-size: 13px; z-index: 200; box-shadow: 0 4px 12px rgba(0,0,0,0.3); display: flex; align-items: center; gap: 8px; animation: toastIn .2s ease; }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes su-spin-edit { to { transform: rotate(360deg); } }
#fileInput { display: none; }
.su-footer { text-align: center; padding: 16px; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.8rem; transition: border-color .25s, color .25s; }
.su-footer p { margin: 0; }
.su-footer-fineprint { margin-top: 6px !important; font-size: 0.7rem; opacity: 0.75; }
.su-footer-link { background: none; border: none; padding: 0; color: inherit; font: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: 2px; }
.su-footer-link:hover { color: var(--text); }
.su-dialog { max-width: 520px; width: calc(100% - 32px); max-height: calc(100% - 32px); inset: 0; margin: auto; padding: 0; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--text); box-shadow: 0 20px 60px rgba(0,0,0,0.4); }
.su-dialog::backdrop { background: rgba(0,0,0,0.45); backdrop-filter: blur(2px); }
.su-dialog-header { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.su-dialog-header h2 { font-size: 1rem; font-weight: 600; }
.su-dialog-close { width: 28px; height: 28px; padding: 0; display: flex; align-items: center; justify-content: center; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all .15s; }
.su-dialog-close:hover { background: var(--surface-hover); color: var(--text); }
.su-dialog-body { padding: 16px 18px; font-size: 0.875rem; line-height: 1.55; color: var(--text); }
.su-dialog-body p { margin-bottom: 12px; }
.su-dialog-body p:last-child { margin-bottom: 0; }
.su-dialog-body code { font-family: var(--mono); background: var(--surface-hover); padding: 1px 5px; border-radius: 4px; font-size: 0.85em; }
.su-dialog-body a { color: var(--primary); text-decoration: none; }
.su-dialog-body a:hover { text-decoration: underline; }
.su-dialog-fineprint { font-size: 0.8rem; color: var(--text-muted); }
.su-credits-list { margin: 0 0 12px; padding-left: 20px; }
.su-credits-list li { margin-bottom: 6px; }
.su-credits-list li:last-child { margin-bottom: 0; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
/* Hide the doc-stats line once the action row gets tight - it's purely informational. */
@media (max-width: 960px) {
.stats-text { display: none; }
}
/* Below 880px, drop the "Options" word - the gear glyph alone is enough.
Below 768px (single-column grid kicks in), also collapse Copy HTML / Export labels
to icon-only so the entire action row stays on one line on phones. */
@media (max-width: 880px) {
#optionsBtn .opt-label { display: none; }
#optionsBtn { padding: 4px 8px; }
.panel-actions { gap: 6px; }
}
@media (max-width: 768px) {
main { padding: 16px 12px; }
/* Single-column: stack panes vertically with a clear gap so the right pane's
panel-bar (tabs + actions) doesn't sit flush against the editor. */
.grid { grid-template-columns: 1fr; row-gap: 24px; }
.splitter { display: none; }
#editorMount { min-height: 220px; }
.output-panel { min-height: 320px; }
.panel-bar { flex-wrap: wrap; row-gap: 8px; padding-bottom: 10px; height: auto; min-height: 38px; }
.panel-actions { gap: 6px; flex-wrap: wrap; justify-content: flex-end; flex: 1 1 auto; }
.btn-sm { padding: 5px 9px; height: 23px; font-size: 11px; }
.options-popover, .export-menu { right: 0; left: auto; max-width: calc(100vw - 24px); }
.options-popover { min-width: 220px; }
/* Collapse Copy HTML and Export to icon-only on the right pane. Share stays full-width on the left because that pane is less crowded. */
#copyBtn .btn-label, #exportBtn .btn-label { display: none; }
#exportBtn { padding: 4px 9px; }
}
@media (max-width: 640px) {
header { padding: 0 12px; }
.logo-svg { height: 20px; }
.logo-badge { font-size: 11px; padding: 2px 7px; }
.btn { padding: 6px 10px; font-size: 12px; }
.view-tab { padding: 3px 8px; font-size: 11px; }
}
</style>
</head>
<body>
<noscript>
<p class="su-noscript"><strong>Markdown to HTML</strong> — Convert Markdown to self-contained HTML pages or print-ready PDFs with table of contents, syntax highlighting, and dark mode. Requires JavaScript; please enable it. Source on <a href="https://github.com/secutils-dev/secutils/blob/main/dev/tools/markdown-to-html.html">GitHub</a>.</p>
</noscript>
<header>
<a class="logo" href="https://secutils.dev" target="_blank" rel="noopener">
<svg class="logo-svg" height="24" role="img" viewBox="0 0 98 16" xmlns="http://www.w3.org/2000/svg">
<path d="m3 0h10c1.662 0 3 1.338 3 3v10c0 1.662-1.338 3-3 3h-10c-1.662 0-3-1.338-3-3v-10c0-1.662 1.338-3 3-3z" fill="#fed047"/>
<path aria-label="SU" d="m11.285 12q-1.12 0-1.728-0.608-0.608-0.61867-0.608-1.6747v-5.6107h1.152v5.6q0 0.59733 0.29867 0.93867 0.29867 0.34133 0.88534 0.34133 0.58667 0 0.88534-0.34133 0.29867-0.34134 0.29867-0.93867v-5.6h1.152v5.6107q0 1.0667-0.608 1.6747t-1.728 0.608zm-6.368 0q-1.152 0-1.8453-0.608-0.69334-0.608-0.69334-1.664h1.1307q0 0.58667 0.384 0.928 0.384 0.33067 1.024 0.33067 0.62934 0 0.992-0.34133 0.36267-0.34134 0.36267-0.90667 0-0.42667-0.23467-0.74667t-0.672-0.43733l-1.12-0.29867q-0.78934-0.21333-1.248-0.77867-0.448-0.56534-0.448-1.3547 0-0.64 0.27733-1.1093 0.288-0.48 0.81067-0.74667t1.216-0.26667 1.216 0.26667q0.53334 0.26667 0.82134 0.74667 0.29867 0.46933 0.29867 1.0987h-1.1307q0-0.50133-0.34133-0.8-0.33067-0.30933-0.864-0.30933t-0.864 0.30933q-0.32 0.29867-0.32 0.78934 0 0.39467 0.21333 0.66134 0.224 0.26667 0.61867 0.37333l1.152 0.30933q0.81067 0.21333 1.28 0.832t0.46933 1.4613q0 0.69334-0.30933 1.2053-0.30933 0.50133-0.864 0.77867-0.55467 0.27733-1.312 0.27733z" fill="#642340"/>
<path class="logo-text-fill" aria-label="SECUTILS.DEV" d="m93.158 12.117-1.9733-7.7867h1.1733l1.2587 5.184q0.11733 0.46933 0.20267 0.91734 0.08533 0.448 0.128 0.69334 0.04267-0.24533 0.128-0.69334 0.096-0.45867 0.21333-0.928l1.2053-5.1733h1.184l-1.984 7.7867zm-7.8294 0v-7.7867h4.576v1.024h-3.4453v2.2187h3.072v0.992h-3.072v2.528h3.4453v1.024zm-6.5174 0v-7.7867h2.176q0.768 0 1.3333 0.29867 0.56534 0.288 0.87467 0.832 0.32 0.53334 0.32 1.248v3.008q0 0.736-0.32 1.2693-0.30933 0.53334-0.87467 0.832-0.56534 0.29867-1.3333 0.29867zm1.152-1.0347h1.024q0.62934 0 1.0027-0.36267 0.37333-0.36267 0.37333-1.0027v-3.008q0-0.61867-0.37333-0.98134-0.37334-0.37333-1.0027-0.37333h-1.024zm-5.2374 1.1413q-0.416 0-0.68267-0.24533-0.256-0.256-0.256-0.672 0-0.416 0.256-0.672 0.26667-0.26667 0.68267-0.26667 0.416 0 0.672 0.26667 0.26667 0.256 0.26667 0.672 0 0.416-0.26667 0.672-0.256 0.24533-0.672 0.24533zm-6.368 0q-1.152 0-1.8453-0.608-0.69334-0.608-0.69334-1.664h1.1307q0 0.58667 0.384 0.928 0.384 0.33067 1.024 0.33067 0.62934 0 0.992-0.34133 0.36267-0.34134 0.36267-0.90667 0-0.42667-0.23467-0.74667t-0.672-0.43733l-1.12-0.29867q-0.78934-0.21333-1.248-0.77867-0.448-0.56534-0.448-1.3547 0-0.64 0.27733-1.1093 0.288-0.48 0.81067-0.74667 0.52267-0.26667 1.216-0.26667 0.69334 0 1.216 0.26667 0.53334 0.26667 0.82134 0.74667 0.29867 0.46933 0.29867 1.0987h-1.1307q0-0.50134-0.34133-0.8-0.33067-0.30933-0.864-0.30933t-0.864 0.30933q-0.32 0.29867-0.32 0.78934 0 0.39467 0.21333 0.66134 0.224 0.26667 0.61867 0.37333l1.152 0.30933q0.81067 0.21333 1.28 0.832 0.46934 0.61867 0.46934 1.4613 0 0.69334-0.30934 1.2053-0.30933 0.50134-0.864 0.77867-0.55467 0.27733-1.312 0.27733zm-8.288-0.10667v-7.7867h1.152v6.7414h3.4027v1.0453zm-6.6987 0v-1.0453h1.568v-5.696h-1.568v-1.0453h4.32v1.0453h-1.5787v5.696h1.5787v1.0453zm-4.8214 0v-6.7414h-2.08v-1.0453h5.3227v1.0453h-2.0907v6.7414zm-5.824 0.10667q-1.12 0-1.728-0.608-0.608-0.61867-0.608-1.6747v-5.6107h1.152v5.6q0 0.59733 0.29867 0.93867 0.29867 0.34133 0.88534 0.34133 0.58667 0 0.88534-0.34133 0.29867-0.34134 0.29867-0.93867v-5.6h1.152v5.6107q0 1.0667-0.608 1.6747t-1.728 0.608zm-6.3147 0q-1.0987 0-1.7493-0.608-0.64-0.61867-0.64-1.664v-3.456q0-1.056 0.64-1.664 0.65067-0.608 1.7493-0.608 1.088 0 1.728 0.61867 0.65067 0.608 0.65067 1.6533h-1.152q0-0.608-0.33067-0.928-0.32-0.32-0.896-0.32-0.58667 0-0.91734 0.32-0.32 0.32-0.32 0.928v3.456q0 0.608 0.32 0.928 0.33067 0.32 0.91734 0.32 0.576 0 0.896-0.32 0.33067-0.32 0.33067-0.928h1.152q0 1.0453-0.65067 1.664-0.64 0.608-1.728 0.608zm-8.6827-0.10667v-7.7867h4.576v1.024h-3.4453v2.2187h3.072v0.992h-3.072v2.528h3.4453v1.024zm-4.1707 0.10667q-1.152 0-1.8453-0.608-0.69334-0.608-0.69334-1.664h1.1307q0 0.58667 0.384 0.928 0.384 0.33067 1.024 0.33067 0.62934 0 0.992-0.34133 0.36267-0.34134 0.36267-0.90667 0-0.42667-0.23467-0.74667-0.23467-0.32-0.672-0.43733l-1.12-0.29867q-0.78934-0.21333-1.248-0.77867-0.448-0.56534-0.448-1.3547 0-0.64 0.27733-1.1093 0.288-0.48 0.81067-0.74667 0.52267-0.26667 1.216-0.26667 0.69334 0 1.216 0.26667 0.53334 0.26667 0.82134 0.74667 0.29867 0.46933 0.29867 1.0987h-1.1307q0-0.50134-0.34134-0.8-0.33067-0.30933-0.864-0.30933t-0.864 0.30933q-0.32 0.29867-0.32 0.78934 0 0.39467 0.21333 0.66134 0.224 0.26667 0.61867 0.37333l1.152 0.30933q0.81067 0.21333 1.28 0.832 0.46934 0.61867 0.46934 1.4613 0 0.69334-0.30934 1.2053-0.30933 0.50134-0.864 0.77867-0.55467 0.27733-1.312 0.27733z"/>
</svg>
<span class="logo-badge">Markdown → HTML</span>
</a>
<div class="header-right">
<a id="skillLink" class="skill-link" href="#" target="_blank" rel="noopener"
title="View AI agent skill (skill.md, opens in new tab)"
aria-label="View AI agent skill (opens in new tab)">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
<path d="M9.937 15.5A2 2 0 0 0 8.5 14.063l-6.135-1.582a.5.5 0 0 1 0-.962L8.5 9.936A2 2 0 0 0 9.937 8.5l1.582-6.135a.5.5 0 0 1 .963 0L14.063 8.5A2 2 0 0 0 15.5 9.937l6.135 1.582a.5.5 0 0 1 0 .962L15.5 14.063a2 2 0 0 0-1.437 1.437l-1.582 6.135a.5.5 0 0 1-.963 0z"/>
<path d="M20 3v4"/><path d="M22 5h-4"/><path d="M4 17v2"/><path d="M5 18H3"/>
</svg>
<span>Skill</span>
</a>
<button class="theme-toggle" id="themeToggle" aria-label="Toggle theme">
<svg class="icon-sun" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8.5 15h-1v-2h1v2Zm-3.674-3.107-1.414 1.414-.707-.707 1.414-1.415.707.708Zm8.479.707-.707.707-1.414-1.414.707-.708 1.414 1.415Z"/><path fill-rule="evenodd" d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Zm0 1a3 3 0 1 0 0 6 3 3 0 0 0 0-6Z" clip-rule="evenodd"/><path d="M3.005 8.505h-2v-1h2v1Zm12 0h-2v-1h2v1ZM4.82 4.114l-.708.707-1.414-1.414.707-.707L4.82 4.114Zm8.492-.707-1.414 1.414-.708-.707L12.605 2.7l.707.707ZM8.5 3h-1V1h1v2Z"/></svg>
<svg class="icon-moon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M4.05 12.95A6.982 6.982 0 0 1 2 8c0-1.79.684-3.583 2.05-4.95A6.982 6.982 0 0 1 9 1a1 1 0 0 1 .708 1.707 4.982 4.982 0 0 0-1.465 3.536 4.98 4.98 0 0 0 1.465 3.535 4.98 4.98 0 0 0 3.535 1.465 1 1 0 0 1 .707 1.707A6.981 6.981 0 0 1 9 15a6.983 6.983 0 0 1-4.95-2.05Zm.708-.707A5.983 5.983 0 0 0 9 14c1.535 0 3.07-.586 4.242-1.757a5.98 5.98 0 0 1-4.018-1.545L9 10.485a5.982 5.982 0 0 1-1.758-4.242A5.986 5.986 0 0 1 9 2a5.983 5.983 0 0 0-4.243 1.757A5.98 5.98 0 0 0 3 8l.006.288a5.978 5.978 0 0 0 1.75 3.955Z"/></svg>
</button>
</div>
</header>
<main>
<div class="grid">
<div class="panel">
<div class="panel-bar">
<span class="panel-label">Markdown</span>
<div class="panel-actions">
<button class="link-btn" id="exampleBtn">Example</button>
<button class="link-btn" id="uploadBtn">Upload</button>
<button class="link-btn" id="clearBtn">Clear</button>
<button id="shareBtn" class="btn btn-primary btn-sm" disabled title="Copy a shareable link with your Markdown encoded in the URL">Share</button>
</div>
</div>
<div id="editorMount" aria-label="Markdown editor"></div>
</div>
<div class="splitter" id="splitter"></div>
<div id="previewPane" class="panel">
<div class="panel-bar">
<div class="view-tabs" role="tablist" aria-label="Preview view">
<button id="tabMarkdown" class="view-tab active" role="tab" aria-selected="true" aria-controls="previewArticle" title="Quick rendered preview (current page styling)">Markdown</button>
<button id="tabHtml" class="view-tab" role="tab" aria-selected="false" aria-controls="htmlPreview" title="Exact preview of the self-contained HTML download">HTML</button>
</div>
<div class="panel-actions">
<span id="docStats" class="stats-text">empty</span>
<div class="options-anchor">
<button id="optionsBtn" class="btn btn-sm" aria-haspopup="true" aria-expanded="false" title="Export options">⚙<span class="opt-label"> Options</span></button>
<div id="optionsPopover" class="options-popover" hidden role="dialog" aria-label="Export options">
<h4>Export options</h4>
<label>
<input type="checkbox" id="optToc" checked>
<span>Table of contents
<span class="opt-desc">Floating sidebar generated from h2/h3 headings.</span>
</span>
</label>
<label>
<input type="checkbox" id="optPdf" checked>
<span>PDF export button
<span class="opt-desc">Floating button that opens the browser print dialog (Save as PDF).</span>
</span>
</label>
<label>
<input type="checkbox" id="optSource">
<span>Embed Markdown source
<span class="opt-desc">Inert <code><script type="text/markdown"></code> at the end of body, retrievable via <code>document.getElementById('su-md-source').textContent</code>.</span>
</span>
</label>
</div>
</div>
<button id="copyBtn" class="btn btn-sm" disabled title="Copy the self-contained HTML to your clipboard">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="4" y="4" width="9" height="10" rx="1.5"/><path d="M3 11V3.5A1.5 1.5 0 0 1 4.5 2H10"/></svg>
<span class="btn-label">Copy HTML</span>
</button>
<div class="export-anchor">
<button id="exportBtn" class="btn btn-primary btn-sm" disabled aria-haspopup="menu" aria-expanded="false" title="Export the document">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M8 2v9"/><path d="M4.5 7.5 8 11l3.5-3.5"/><path d="M3 13.5h10"/></svg>
<span class="btn-label">Export</span>
<svg class="chevron" viewBox="0 0 12 12" width="10" height="10" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m3 5 3 3 3-3"/></svg>
</button>
<div id="exportMenu" class="export-menu" hidden role="menu" aria-label="Export menu">
<button class="export-item" role="menuitem" id="exportHtmlBtn">HTML</button>
<button class="export-item" role="menuitem" id="exportPdfBtn">PDF</button>
</div>
</div>
<button id="fullscreenBtn" class="icon-btn" title="Toggle fullscreen" aria-label="Toggle fullscreen">
<svg id="fullscreenEnterIcon" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M8 3H5a2 2 0 0 0-2 2v3m18 0V5a2 2 0 0 0-2-2h-3m0 18h3a2 2 0 0 0 2-2v-3M3 16v3a2 2 0 0 0 2 2h3"/></svg>
<svg id="fullscreenExitIcon" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="display:none"><path d="M8 3v3a2 2 0 0 1-2 2H3m18 0h-3a2 2 0 0 1-2-2V3m0 18v-3a2 2 0 0 1 2-2h3M3 16h3a2 2 0 0 1 2 2v3"/></svg>
</button>
</div>
</div>
<div class="output-panel">
<div id="previewScroll" class="output-scroll">
<div id="previewArticle" class="preview-article" role="tabpanel" aria-labelledby="tabMarkdown"></div>
<div id="emptyState" class="empty-state">
<div class="empty-state-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><path d="M14 2v6h6"/><path d="M9 13h6"/><path d="M9 17h6"/></svg>
</div>
<div class="empty-state-title">Waiting for input...</div>
<div class="empty-state-sub">Type, paste, drop a file, or load the example</div>
</div>
</div>
<iframe id="htmlPreview" class="html-preview-frame" title="Rendered HTML preview" role="tabpanel" aria-labelledby="tabHtml" sandbox="allow-scripts" hidden></iframe>
</div>
</div>
</div>
<aside class="su-more-tools" aria-label="More free tools">
<p>Other free, no-signup Secutils.dev tools for JWT, SAML, certificates, HTTP echo, and more - <a href="https://{{TOOLS_HOST}}/">Browse all tools →</a></p>
</aside>
</main>
<footer class="su-footer">
<p>Convert Markdown to self-contained HTML or print-ready PDFs.</p>
<p class="su-footer-fineprint">
<button type="button" class="su-footer-link" id="privacyOpen">Privacy</button>
<span aria-hidden="true"> · </span>
<button type="button" class="su-footer-link" id="creditsOpen">Credits</button>
</p>
</footer>
<dialog id="privacyDialog" class="su-dialog" aria-labelledby="privacyDialogTitle">
<header class="su-dialog-header">
<h2 id="privacyDialogTitle">Privacy</h2>
<button type="button" class="su-dialog-close" id="privacyClose" aria-label="Close">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 3l10 10M13 3L3 13"/></svg>
</button>
</header>
<div class="su-dialog-body">
<p><strong>Your data stays in your browser.</strong> These tools run entirely client-side. Tokens, PEMs, SAML payloads, Markdown source, and mock-response bodies are never sent to the Secutils.dev server. State that needs to survive a reload (or be shared) lives in the URL fragment (<code>#…</code>), which browsers never transmit to the server.</p>
<p><strong>Anonymous usage analytics.</strong> We use <a href="https://plausible.io/" target="_blank" rel="noopener noreferrer">Plausible Analytics</a>, a privacy-first, GDPR-compliant tool, to collect aggregate usage data. No cookies, no personal data, no individual tracking. The data is limited to top pages, referral sources, visit duration, and device-class metadata (device type, OS, country, browser). Full details in the <a href="https://plausible.io/data-policy" target="_blank" rel="noopener noreferrer">Plausible Data Policy</a>.</p>
<p class="su-dialog-fineprint">See the full <a href="https://secutils.dev/privacy" target="_blank" rel="noopener noreferrer">Secutils.dev privacy policy</a> for details on the wider service.</p>
</div>
</dialog>
<dialog id="creditsDialog" class="su-dialog" aria-labelledby="creditsDialogTitle">
<header class="su-dialog-header">
<h2 id="creditsDialogTitle">Credits</h2>
<button type="button" class="su-dialog-close" id="creditsClose" aria-label="Close">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 3l10 10M13 3L3 13"/></svg>
</button>
</header>
<div class="su-dialog-body">
<p>This tool is powered by the following open-source libraries:</p>
<ul class="su-credits-list">
<li><a href="https://github.com/markedjs/marked" target="_blank" rel="noopener noreferrer"><strong>marked</strong></a> - Markdown parser and compiler, used to render the source into HTML.</li>
<li><a href="https://github.com/highlightjs/highlight.js" target="_blank" rel="noopener noreferrer"><strong>highlight.js</strong></a> - syntax highlighter, used to colourise fenced code blocks in the preview and exported HTML.</li>
<li><a href="https://github.com/codemirror/dev" target="_blank" rel="noopener noreferrer"><strong>CodeMirror</strong></a> - extensible code editor, powers the Markdown source pane with syntax highlighting and line numbers.</li>
<li><a href="https://github.com/pagedjs/pagedjs" target="_blank" rel="noopener noreferrer"><strong>Paged.js</strong></a> - CSS Paged Media polyfill, used to paginate the rendered HTML into a vector PDF on Export.</li>
</ul>
<p class="su-dialog-fineprint">All trademarks are property of their respective owners.</p>
</div>
</dialog>
<input type="file" id="fileInput" accept=".md,.markdown,.txt,.mdx">
<div id="toast" class="toast" style="display:none">
<span id="toastMsg"></span>
</div>
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
<!-- CodeMirror 6 ESM loader. Falls back to a plain textarea if any import fails. -->
<script type="module">
const mount = document.getElementById('editorMount');
try {
const [cm, cmMd, cmState] = await Promise.all([
import('https://esm.sh/codemirror@6.0.1?bundle'),
import('https://esm.sh/@codemirror/lang-markdown@6.3.0?bundle'),
import('https://esm.sh/@codemirror/state@6.4.1?bundle'),
]);
const view = new cm.EditorView({
state: cmState.EditorState.create({
doc: window.__suInitialDoc || '',
extensions: [
cm.basicSetup,
cmMd.markdown(),
cm.EditorView.lineWrapping,
cm.EditorView.updateListener.of((u) => {
if (u.docChanged) window.__suOnEditorChange?.(u.state.doc.toString());
}),
],
}),
parent: mount,
});
window.__suEditorAPI = {
kind: 'codemirror',
setText: (t) => view.dispatch({ changes: { from: 0, to: view.state.doc.length, insert: t } }),
getText: () => view.state.doc.toString(),
focus: () => view.focus(),
};
window.__suEditorReady?.();
} catch (err) {
console.warn('CodeMirror failed to load, falling back to <textarea>:', err);
const ta = document.createElement('textarea');
ta.className = 'editor-fallback';
ta.spellcheck = false;
ta.placeholder = 'Type or paste Markdown here...';
ta.value = window.__suInitialDoc || '';
ta.addEventListener('input', () => window.__suOnEditorChange?.(ta.value));
mount.replaceChildren(ta);
window.__suEditorAPI = {
kind: 'textarea',
setText: (t) => { ta.value = t; window.__suOnEditorChange?.(t); },
getText: () => ta.value,
focus: () => ta.focus(),
};
window.__suEditorReady?.();
}
</script>
<script>
const PAGEDJS_URL = 'https://cdn.jsdelivr.net/npm/pagedjs@0.4.3/dist/paged.polyfill.js';
const MD_FILE_EXT = /\.(md|markdown|txt|mdx)$/i;
const FRONTMATTER_RE = /^---\r?\n([\s\S]*?)\r?\n---\r?\n/;
const FRONTMATTER_TITLE_RE = /^title:\s*['"]?(.+?)['"]?\s*$/m;
const $ = (id) => document.getElementById(id);
const els = {
editorMount: $('editorMount'),
previewScroll: $('previewScroll'),
previewArticle: $('previewArticle'),
htmlPreview: $('htmlPreview'),
emptyState: $('emptyState'),
docStats: $('docStats'),
fileInput: $('fileInput'),
themeToggle: $('themeToggle'),
skillLink: $('skillLink'),
exampleBtn: $('exampleBtn'),
uploadBtn: $('uploadBtn'),
clearBtn: $('clearBtn'),
optionsBtn: $('optionsBtn'),
optionsPopover: $('optionsPopover'),
optToc: $('optToc'),
optPdf: $('optPdf'),
optSource: $('optSource'),
shareBtn: $('shareBtn'),
copyBtn: $('copyBtn'),
exportBtn: $('exportBtn'),
exportMenu: $('exportMenu'),
exportHtmlBtn: $('exportHtmlBtn'),
exportPdfBtn: $('exportPdfBtn'),
splitter: $('splitter'),
toast: $('toast'),
toastMsg: $('toastMsg'),
tabMarkdown: $('tabMarkdown'),
tabHtml: $('tabHtml'),
previewPane: $('previewPane'),
fullscreenBtn: $('fullscreenBtn'),
fullscreenEnterIcon: $('fullscreenEnterIcon'),
fullscreenExitIcon: $('fullscreenExitIcon'),
};
let markdown = '';
let filename = 'document';
let renderTimer;
let toastTimer;
let activeTab = 'markdown';
let htmlPreviewDirty = true;
const EXAMPLE_MD = [
'# Welcome to Markdown to HTML',
'',
'A short demo of what the **converter** captures: headings, formatting, code, tables, lists, and links. Edit the left pane and watch the preview update.',
'',
'## Features',
'',
'- Live preview with CodeMirror-powered Markdown highlighting',
'- Self-contained HTML export (single file, no external assets)',
'- Print-ready PDF via the browser print dialog',
'- Optional table of contents and embedded Markdown source',
'- Dark/light theme toggle that persists across loads',
'- Shareable URL state (the entire document fits in the URL fragment)',
'',
'## Code blocks',
'',
'```js',
'function greet(name) {',
' return "Hello, " + name + "!";',
'}',
'console.log(greet("world"));',
'```',
'',
'## Tables',
'',
'| Feature | Status |',
'|------------------------|--------|',
'| GFM (GitHub-flavoured) | yes |',
'| Syntax highlighting | yes |',
'| Math (KaTeX / MathJax) | no |',
'',
'## Quotes',
'',
'> "The best Markdown is the one you can share."',
'',
'## Links',
'',
'See the [project on GitHub](https://github.com/secutils-dev/secutils) for source and discussions.',
'',
].join('\n');
// URL state encoding: see dev/tools/AGENTS.md → "URL state encoding".
const utf8Enc = new TextEncoder();
const utf8Dec = new TextDecoder();
const toBase64Url = (bytes) => {
let s = '';
for (const b of bytes) s += String.fromCharCode(b);
return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
};
const fromBase64Url = (str) => {
const b64 = str.replace(/-/g, '+').replace(/_/g, '/');
const padded = b64 + '==='.slice(0, (4 - b64.length % 4) % 4);
const bin = atob(padded);
const out = new Uint8Array(bin.length);
for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
return out;
};
const encodeState = async (text) => {
const bytes = utf8Enc.encode(text);
const stream = new Blob([bytes]).stream().pipeThrough(new CompressionStream('deflate-raw'));
const deflated = new Uint8Array(await new Response(stream).arrayBuffer());
const out = new Uint8Array(4 + deflated.length);
new DataView(out.buffer).setUint32(0, bytes.length, true);
out.set(deflated, 4);
return toBase64Url(out);
};
const decodeState = async (str) => {
try {
const bytes = fromBase64Url(str);
if (bytes.length < 4) return null;
const stream = new Blob([bytes.subarray(4)]).stream()
.pipeThrough(new DecompressionStream('deflate-raw'));
const inflated = new Uint8Array(await new Response(stream).arrayBuffer());
return utf8Dec.decode(inflated);
} catch { return null; }
};
(() => {
const root = document.documentElement;
const setTheme = (t) => {
root.setAttribute('data-theme', t);
try { localStorage.setItem('su-tool-theme', t); } catch {}
};
els.themeToggle.addEventListener('click', () => {
setTheme(root.getAttribute('data-theme') === 'dark' ? 'light' : 'dark');
htmlPreviewDirty = true;
if (activeTab === 'html' && markdown.trim()) rebuildHtmlPreview();
});
if (els.skillLink) {
const p = location.pathname;
els.skillLink.href = (p === '/' || p === '') ? '/llms.txt' : p.replace(/\/$/, '') + '.md';
}
try {
const saved = localStorage.getItem('su-tool-theme');
if (saved) setTheme(saved);
else if (window.matchMedia('(prefers-color-scheme: light)').matches) setTheme('light');
} catch {}
})();
(() => {
const dlg = document.getElementById('privacyDialog');
document.getElementById('privacyOpen').addEventListener('click', () => dlg.showModal());
document.getElementById('privacyClose').addEventListener('click', () => dlg.close());
})();
(() => {
const dlg = document.getElementById('creditsDialog');
document.getElementById('creditsOpen').addEventListener('click', () => dlg.showModal());
document.getElementById('creditsClose').addEventListener('click', () => dlg.close());
})();
marked.use({ gfm: true, breaks: false });
const escHTML = (s) => s.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
function render(md) {
const el = document.createElement('div');
el.innerHTML = marked.parse(md);
for (const block of el.querySelectorAll('pre code')) {
const langCls = [...block.classList].find((c) => c.startsWith('language-'));
try { hljs.highlightElement(block); } catch {}
if (langCls) block.parentElement.setAttribute('data-lang', langCls.replace('language-', ''));
}
return el.innerHTML;
}
function stripFrontmatter(md) {
const m = md.match(FRONTMATTER_RE);
if (!m) return md;
const t = m[1].match(FRONTMATTER_TITLE_RE);
if (t) filename = t[1];
return md.slice(m[0].length);
}
function extractTitle(html) {
const tm = html.match(/<h1[^>]*>(.*?)<\/h1>/i);
return tm ? tm[1].replace(/<[^>]*>/g, '') : filename;
}
function updatePreview() {
if (!markdown.trim()) {
els.previewArticle.innerHTML = '';
showActiveTabPanel();
els.docStats.textContent = 'empty';
setExportEnabled(false);
htmlPreviewDirty = true;
return;
}
els.previewArticle.innerHTML = render(markdown);
htmlPreviewDirty = true;
showActiveTabPanel();
if (activeTab === 'html') rebuildHtmlPreview();
const wordCount = markdown.trim().split(/\s+/).length;
els.docStats.textContent = `${wordCount} word${wordCount === 1 ? '' : 's'}`;
setExportEnabled(true);
}
function rebuildHtmlPreview() {
if (!markdown.trim()) {
els.htmlPreview.removeAttribute('srcdoc');
htmlPreviewDirty = false;
return;
}
// Inject the parent's current theme so the iframe matches the page (the
// sandboxed iframe can't reach the parent's localStorage; without this it
// would fall back to prefers-color-scheme and may not match the page).
const parentTheme = document.documentElement.getAttribute('data-theme') || 'dark';
const doc = generateOutput(readOptions()).replace(
/data-theme="(?:light|dark)"/,
`data-theme="${parentTheme}"`,
);
els.htmlPreview.srcdoc = doc;
htmlPreviewDirty = false;
}
function showActiveTabPanel() {
const hasContent = markdown.trim() !== '';
const isHtml = activeTab === 'html';
if (!hasContent) {
els.previewScroll.hidden = false;
els.htmlPreview.hidden = true;
els.emptyState.style.display = 'flex';
els.previewArticle.style.display = 'none';
return;
}
els.emptyState.style.display = 'none';
els.previewArticle.style.display = '';
els.previewScroll.hidden = isHtml;
els.htmlPreview.hidden = !isHtml;
}
function setActiveTab(tab) {
activeTab = tab;
const isMarkdown = tab === 'markdown';
els.tabMarkdown.classList.toggle('active', isMarkdown);
els.tabHtml.classList.toggle('active', !isMarkdown);
els.tabMarkdown.setAttribute('aria-selected', isMarkdown ? 'true' : 'false');
els.tabHtml.setAttribute('aria-selected', isMarkdown ? 'false' : 'true');
showActiveTabPanel();
if (!isMarkdown && htmlPreviewDirty && markdown.trim()) rebuildHtmlPreview();
}
function setExportEnabled(on) {
for (const b of [els.shareBtn, els.copyBtn, els.exportBtn]) b.disabled = !on;
if (!on) toggleExportMenu(false);
}
function scheduleRender() {
clearTimeout(renderTimer);
renderTimer = setTimeout(updatePreview, 150);
}
window.__suOnEditorChange = (text) => {
markdown = text;
scheduleRender();
};
window.__suEditorReady = () => {
if (window.__suInitialDoc) {
markdown = window.__suInitialDoc;
updatePreview();
}
};
// Hydrate from URL fragment, if any. Sets __suInitialDoc so the editor mounts with content.
(async () => {
if (location.hash.length > 1) {
const initial = await decodeState(location.hash.slice(1));
if (initial) {
window.__suInitialDoc = stripFrontmatter(initial);
// If the editor module already mounted (race), push the doc into it.
if (window.__suEditorAPI) {
window.__suEditorAPI.setText(window.__suInitialDoc);
}
}
}
})();
// Tab wiring
els.tabMarkdown.addEventListener('click', () => setActiveTab('markdown'));
els.tabHtml.addEventListener('click', () => setActiveTab('html'));
// Rebuild the HTML preview when an export option changes while that tab is active.
for (const opt of [els.optToc, els.optPdf, els.optSource]) {
opt.addEventListener('change', () => {
htmlPreviewDirty = true;
if (activeTab === 'html' && markdown.trim()) rebuildHtmlPreview();
});
}
// Action wiring
els.exampleBtn.addEventListener('click', () => {
window.__suEditorAPI?.setText(EXAMPLE_MD);
window.__suEditorAPI?.focus();
});
els.clearBtn.addEventListener('click', () => {
window.__suEditorAPI?.setText('');
history.replaceState({}, '', location.pathname + location.search);
filename = 'document';
window.__suEditorAPI?.focus();
});
els.uploadBtn.addEventListener('click', () => els.fileInput.click());
els.fileInput.addEventListener('change', (e) => {
const file = e.target.files?.[0];
if (file) handleFile(file);
els.fileInput.value = '';
});
function handleFile(file) {
const reader = new FileReader();
reader.onload = (e) => {
filename = file.name.replace(MD_FILE_EXT, '');
const text = stripFrontmatter(e.target.result);
window.__suEditorAPI?.setText(text);
};
reader.readAsText(file);
}
// Drag-and-drop a file onto the editor
els.editorMount.addEventListener('dragover', (e) => {
if (e.dataTransfer?.types.includes('Files')) {
e.preventDefault();
els.editorMount.classList.add('dragover');
}
});
els.editorMount.addEventListener('dragleave', () => els.editorMount.classList.remove('dragover'));
els.editorMount.addEventListener('drop', (e) => {
e.preventDefault();
els.editorMount.classList.remove('dragover');
const file = e.dataTransfer?.files?.[0];
if (file) handleFile(file);
});
// Options popover
function toggleOptions(force) {
const open = force !== undefined ? force : els.optionsPopover.hasAttribute('hidden');
if (open) {
els.optionsPopover.removeAttribute('hidden');
els.optionsBtn.setAttribute('aria-expanded', 'true');
} else {
els.optionsPopover.setAttribute('hidden', '');
els.optionsBtn.setAttribute('aria-expanded', 'false');
}
}
els.optionsBtn.addEventListener('click', (e) => {
e.stopPropagation();
toggleOptions();
});
document.addEventListener('click', (e) => {
if (els.optionsPopover.hasAttribute('hidden')) return;
if (!els.optionsPopover.contains(e.target) && e.target !== els.optionsBtn) toggleOptions(false);
});
document.addEventListener('keydown', (e) => {
if (e.key === 'Escape' && !els.optionsPopover.hasAttribute('hidden')) toggleOptions(false);
});
function readOptions() {
return { toc: els.optToc.checked, pdf: els.optPdf.checked, source: els.optSource.checked };
}
// Fullscreen toggle for the preview pane
els.fullscreenBtn.addEventListener('click', async () => {
try {
if (!document.fullscreenElement) {
await els.previewPane.requestFullscreen();
} else {
await document.exitFullscreen();
}
} catch (e) {
toast(`Fullscreen failed: ${e?.message ?? e}`);
}
});
document.addEventListener('fullscreenchange', () => {
const entering = !!document.fullscreenElement;
els.fullscreenEnterIcon.style.display = entering ? 'none' : 'block';
els.fullscreenExitIcon.style.display = entering ? 'block' : 'none';
});
// Share
els.shareBtn.addEventListener('click', async () => {
if (!markdown.trim()) return;
try {
const encoded = await encodeState(markdown);
const url = `${location.origin}${location.pathname}#${encoded}`;
history.replaceState({}, '', url);
await navigator.clipboard.writeText(url);
toast('Share link copied');
} catch {
toast('Failed to copy share link');
}
});
// Export dropdown (Download HTML / Download PDF)
function toggleExportMenu(force) {
const open = force !== undefined ? force : els.exportMenu.hasAttribute('hidden');
if (open && !els.exportBtn.disabled) {
els.exportMenu.removeAttribute('hidden');
els.exportBtn.setAttribute('aria-expanded', 'true');
els.exportBtn.parentElement.setAttribute('data-open', 'true');
} else {
els.exportMenu.setAttribute('hidden', '');
els.exportBtn.setAttribute('aria-expanded', 'false');
els.exportBtn.parentElement.removeAttribute('data-open');
}
}
els.exportBtn.addEventListener('click', (e) => {
e.stopPropagation();
toggleExportMenu();
});
document.addEventListener('click', (e) => {
if (els.exportMenu.hasAttribute('hidden')) return;
if (!els.exportMenu.contains(e.target) && e.target !== els.exportBtn && !els.exportBtn.contains(e.target)) toggleExportMenu(false);
});
document.addEventListener('keydown', (e) => {
if (e.key === 'Escape' && !els.exportMenu.hasAttribute('hidden')) toggleExportMenu(false);
});
// Copy / Download / PDF
els.copyBtn.addEventListener('click', async () => {
try {
await navigator.clipboard.writeText(generateOutput(readOptions()));
toast('Copied to clipboard');
} catch { toast('Failed to copy'); }
});
els.exportHtmlBtn.addEventListener('click', () => {
toggleExportMenu(false);
const blob = new Blob([generateOutput(readOptions())], { type: 'text/html;charset=utf-8' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `${filename}.html`;
a.click();
URL.revokeObjectURL(url);
toast(`Downloaded ${filename}.html`);
});
els.exportPdfBtn.addEventListener('click', async () => {
toggleExportMenu(false);
const btn = els.exportBtn;
const orig = btn.innerHTML;
btn.disabled = true;
btn.innerHTML = '<svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2.5" style="animation:su-spin-edit 1s linear infinite"><circle cx="12" cy="12" r="9" opacity=".25"/><path d="M21 12a9 9 0 0 1-9 9" stroke-linecap="round"/></svg><span class="btn-label" style="margin-left:6px">Preparing...</span>';
const content = render(markdown);
const printDoc = generatePrintDoc(content, extractTitle(content));
const iframe = document.createElement('iframe');
iframe.setAttribute('aria-hidden', 'true');
iframe.style.cssText = 'position:fixed;left:-9999px;top:0;width:210mm;height:297mm;border:0;visibility:hidden;';
document.body.appendChild(iframe);
const restore = () => { btn.disabled = false; btn.innerHTML = orig; };
let cleaned = false;
const cleanup = () => { if (cleaned) return; cleaned = true; iframe.remove(); restore(); };
toast('Preparing PDF...');
try {
await new Promise((resolve, reject) => {
iframe.addEventListener('load', resolve, { once: true });
iframe.addEventListener('error', reject, { once: true });
iframe.srcdoc = printDoc;
});
await waitForPagedReady(iframe.contentWindow, 15000);
iframe.contentWindow.addEventListener('afterprint', () => setTimeout(cleanup, 100));
iframe.contentWindow.focus();
iframe.contentWindow.print();
setTimeout(cleanup, 30000);
} catch (err) {
toast(`PDF failed: ${err?.message ?? err}`);
cleanup();
}
});
function waitForPagedReady(win, timeoutMs) {
return new Promise((resolve) => {
const start = Date.now();
const poll = () => {
try { if (win?.__suPdfReady) return resolve(); } catch {}
if (Date.now() - start > timeoutMs) return resolve();
setTimeout(poll, 80);
};
poll();
});