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<!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>PEM Certificate Decoder: Inspect X.509 Chains | Secutils.dev</title>
<meta name="description" content="Free PEM X.509 certificate decoder. Inspect chains, view subject, issuer, SANs, validity, fingerprints. Auto-sorts chain order. Browser-only, no signup.">
<meta name="robots" content="index, follow, max-image-preview:large">
<link rel="canonical" href="https://{{TOOLS_HOST}}/pem">
<meta name="su-tool-path" content="/pem">
<meta name="su-tool-name" content="Certificate Decoder">
<meta name="su-tool-description" content="Decode PEM X.509 certificate chains. Subject, issuer, SANs, validity, fingerprints. Auto-sorts chain order. Shareable URL state.">
<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="PEM Certificate Decoder: Inspect X.509 Chains">
<meta property="og:description" content="Free PEM X.509 certificate decoder. Inspect chains, view subject, issuer, SANs, validity, fingerprints. Browser-only, no signup.">
<meta property="og:url" content="https://{{TOOLS_HOST}}/pem">
<meta property="og:image" content="https://secutils.dev/docs/img/og/og-pem.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="PEM Certificate Decoder on Secutils.dev: inspect X.509 chains.">
<meta property="og:locale" content="en_US">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="PEM Certificate Decoder: Inspect X.509 Chains">
<meta name="twitter:description" content="Free PEM X.509 certificate decoder. Inspect chains, view subject, issuer, SANs, validity, fingerprints. No signup.">
<meta name="twitter:image" content="https://secutils.dev/docs/img/og/og-pem.png">
<script type="application/ld+json">{"@context":"https://schema.org","@type":"WebApplication","name":"PEM Certificate Decoder","url":"https://{{TOOLS_HOST}}/pem","applicationCategory":"SecurityApplication","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/certificate-decoder.html","description":"Free PEM X.509 certificate decoder. Inspect chains, view subject, issuer, SANs, validity, fingerprints. Auto-sorts chain order. Browser-only, shareable URL state, no signup."}</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/forge/1.3.1/forge.min.js"></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>
<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;
--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;
--dn-bg: #16171c;
--valid-bg: rgba(16,185,129,0.12); --valid-text: #6ee7b7; --valid-border: rgba(16,185,129,0.2); --valid-dot: #10b981;
--invalid-bg: rgba(239,68,68,0.12); --invalid-text: #fca5a5; --invalid-border: rgba(239,68,68,0.2); --invalid-dot: #ef4444;
--role-root-bg: rgba(168,85,247,0.1); --role-root-text: #c084fc; --role-root-border: rgba(168,85,247,0.2);
--role-leaf-bg: rgba(96,165,250,0.1); --role-leaf-text: #93c5fd; --role-leaf-border: rgba(96,165,250,0.2);
--error-bg: rgba(239,68,68,0.1); --error-text: #fca5a5; --error-border: rgba(239,68,68,0.2);
}
[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;
--accent: #642340;
--badge-bg: #E3E8F2; --badge-text: #505F79;
--dn-bg: #f0f2f5;
--valid-bg: rgba(16,185,129,0.08); --valid-text: #059669; --valid-border: rgba(16,185,129,0.25); --valid-dot: #10b981;
--invalid-bg: rgba(239,68,68,0.08); --invalid-text: #dc2626; --invalid-border: rgba(239,68,68,0.25); --invalid-dot: #ef4444;
--role-root-bg: rgba(147,51,234,0.08); --role-root-text: #7c3aed; --role-root-border: rgba(147,51,234,0.25);
--role-leaf-bg: rgba(37,99,235,0.08); --role-leaf-text: #2563eb; --role-leaf-border: rgba(37,99,235,0.25);
--error-bg: rgba(239,68,68,0.06); --error-text: #dc2626; --error-border: rgba(239,68,68,0.2);
}
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-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); }
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-label { font-size: 13px; font-weight: 600; color: var(--text); }
.panel-actions { display: flex; align-items: center; gap: 8px; }
.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); }
.editor-area { width: 100%; flex: 1; min-height: 300px; font: 13px/1.6 var(--mono); background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; resize: none; outline: none; transition: border-color .15s, background .25s, color .25s; }
.editor-area:focus { border-color: var(--primary); }
.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-bar { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; border-bottom: 1px solid var(--border); }
.output-bar-label { font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.output-bar-actions { display: flex; align-items: center; gap: 10px; }
.output-scroll { flex: 1; overflow-y: auto; padding: 20px; }
.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; }
/* Certificate cards */
.cert-card { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; transition: border-color .15s; }
.cert-card:hover { border-color: var(--text-muted); }
.cert-card + .cert-card { margin-top: 32px; }
.chain-arrow { position: absolute; left: 32px; top: -28px; width: 1px; height: 24px; background: var(--border); }
.chain-arrow::after { content: ''; position: absolute; bottom: -4px; left: -3px; width: 0; height: 0; border-left: 4px solid transparent; border-right: 4px solid transparent; border-top: 5px solid var(--border); }
.cert-card-head { display: flex; justify-content: space-between; align-items: flex-start; padding: 16px 20px; border-bottom: 1px solid var(--border); gap: 12px; }
.cert-cn-row { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; }
.cert-icon { display: flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 6px; background: var(--surface-hover); color: var(--text-muted); flex-shrink: 0; }
.cert-icon svg { width: 16px; height: 16px; stroke: currentColor; fill: none; }
.cert-cn { font-size: 15px; font-weight: 700; color: var(--text); word-break: break-all; }
.cert-meta { display: flex; align-items: center; gap: 8px; margin-top: 6px; flex-wrap: wrap; }
.cert-role { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; padding: 3px 10px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-hover); color: var(--text-muted); }
.cert-role.root { background: var(--role-root-bg); color: var(--role-root-text); border-color: var(--role-root-border); }
.cert-role.leaf { background: var(--role-leaf-bg); color: var(--role-leaf-text); border-color: var(--role-leaf-border); }
.cert-org { font-size: 12px; color: var(--text-muted); max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cert-status-col { text-align: right; flex-shrink: 0; }
.cert-status { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 6px; border: 1px solid; font-size: 11px; font-weight: 700; letter-spacing: 0.3px; }
.cert-status.valid { background: var(--valid-bg); color: var(--valid-text); border-color: var(--valid-border); }
.cert-status.invalid { background: var(--invalid-bg); color: var(--invalid-text); border-color: var(--invalid-border); }
.cert-status-dot { width: 6px; height: 6px; border-radius: 50%; }
.cert-status.valid .cert-status-dot { background: var(--valid-dot); }
.cert-status.invalid .cert-status-dot { background: var(--invalid-dot); }
.cert-expiry { font: 10px var(--mono); color: var(--text-muted); margin-top: 6px; }
.cert-card-body { padding: 20px; display: flex; flex-direction: column; gap: 20px; }
.cert-dn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.cert-label { font-size: 10px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
.cert-label-count { color: var(--text-muted); opacity: 0.6; margin-left: 4px; }
.dn-box { background: var(--dn-bg); padding: 10px 12px; border-radius: 6px; border: 1px solid var(--border); font: 11px/1.6 var(--mono); color: var(--text); word-break: break-all; user-select: all; }
.dn-key { color: var(--text-muted); }
.dn-issuer-cn { font-weight: 700; margin-bottom: 4px; }
.san-list { display: flex; flex-wrap: wrap; gap: 6px; max-height: 128px; overflow-y: auto; }
.san-tag { display: inline-flex; align-items: center; padding: 4px 8px; border-radius: 4px; background: var(--surface-hover); border: 1px solid var(--border); font: 12px var(--mono); color: var(--text); user-select: all; transition: border-color .15s; }
.san-tag:hover { border-color: var(--text-muted); }
.cert-details { display: flex; gap: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.cert-detail-col { flex: 1; min-width: 0; }
.cert-dates { font: 12px var(--mono); color: var(--text); line-height: 1.8; }
.cert-dim { color: var(--text-muted); }
.fingerprint-box { font: 12px var(--mono); color: var(--text); word-break: break-all; user-select: all; background: var(--dn-bg); padding: 6px 8px; border-radius: 4px; border: 1px solid var(--border); }
.serial-value { font: 10px var(--mono); color: var(--text-muted); word-break: break-all; user-select: all; margin-top: 4px; }
/* Empty state */
.empty-state { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); opacity: 0.5; padding: 40px; }
.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; }
.empty-state-sub { font-size: 12px; }
/* Error */
.error-box { padding: 14px 16px; border-radius: 8px; background: var(--error-bg); border: 1px solid var(--error-border); color: var(--error-text); font-size: 13px; display: flex; align-items: flex-start; gap: 10px; }
.error-box svg { flex-shrink: 0; margin-top: 1px; }
.error-title { font-weight: 600; margin-bottom: 4px; }
/* 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; }
.toast.show { animation: toastIn .2s ease; }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.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); }
@media (max-width: 768px) {
.cert-dn-grid { grid-template-columns: 1fr; }
.cert-details { flex-direction: column; }
}
/* Stack the two panes vertically as soon as the side-by-side columns get too
narrow for the bar contents (label + Example self-signed + Example
intermediate + Clear + Share on the left). 900 px matches JWT and SAML;
below this the 2-column splitter view forces every label and link-btn to
wrap onto multiple lines. */
@media (max-width: 900px) {
.grid { grid-template-columns: 1fr; row-gap: 24px; }
.splitter { display: none; }
.panel-bar { flex-wrap: wrap; row-gap: 8px; height: auto; min-height: 38px; }
.panel-actions { flex-wrap: wrap; justify-content: flex-end; }
.editor-area { flex: none; }
.output-panel { min-height: 400px; }
}
/* Phone-sized tweaks (header padding, smaller logo / badge / buttons). */
@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; }
main { padding: 16px 12px; }
.editor-area { min-height: 200px; }
.cert-card-head { flex-direction: column; gap: 10px; }
.cert-status-col { text-align: left; }
}
</style>
</head>
<body>
<noscript>
<p class="su-noscript"><strong>PEM Certificate Decoder</strong> — Decode and inspect PEM-encoded X.509 certificate chains. Subject, issuer, SANs, validity, fingerprints. Requires JavaScript; please enable it. Source on <a href="https://github.com/secutils-dev/secutils/blob/main/dev/tools/certificate-decoder.html">GitHub</a>.</p>
</noscript>
<header>
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</svg>
<span class="logo-badge">Certificate Decoder</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)">
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<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">PEM Input</span>
<div class="panel-actions">
<button class="link-btn" id="exampleBtn">Example</button>
<button class="link-btn" id="clearBtn">Clear</button>
<button id="shareBtn" class="btn btn-primary btn-sm" title="Copy a shareable link with your PEM input encoded in the URL">Share</button>
</div>
</div>
<textarea id="pemInput" class="editor-area" spellcheck="false" placeholder="-----BEGIN CERTIFICATE----- MIID... -----END CERTIFICATE----- Paste one or more PEM certificates here"></textarea>
</div>
<div class="splitter" id="splitter"></div>
<div class="panel">
<div class="panel-bar">
<span class="panel-label">Decoded</span>
<div class="panel-actions">
<span id="stats" class="stats-text">0 certificates</span>
</div>
</div>
<div class="output-panel">
<div id="outputContainer" class="output-scroll">
<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"><rect width="18" height="11" x="3" y="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg>
</div>
<div class="empty-state-title">Waiting for input...</div>
<div class="empty-state-sub">Paste a PEM-encoded certificate chain</div>
</div>
</div>
</div>
</div>
</div>
<aside class="su-more-tools" aria-label="More free tools">
<p>Other free, no-signup Secutils.dev tools for JWT, SAML, Markdown, HTTP echo, and more - <a href="https://{{TOOLS_HOST}}/">Browse all tools →</a></p>
</aside>
</main>
<footer class="su-footer">
<p>Decode and inspect PEM-encoded X.509 certificate chains.</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/digitalbazaar/forge" target="_blank" rel="noopener noreferrer"><strong>node-forge</strong></a> - pure-JavaScript TLS toolkit, used to parse PEM/DER bytes and decode X.509 certificate structures.</li>
</ul>
<p class="su-dialog-fineprint">All trademarks are property of their respective owners.</p>
</div>
</dialog>
<div id="toast" class="toast" style="display:none">
<span id="toastMsg"></span>
</div>
<script>
(function() {
var skillLinkEl = document.getElementById('skillLink');
if (skillLinkEl) {
var p = location.pathname;
skillLinkEl.href = (p === '/' || p === '') ? '/llms.txt' : p.replace(/\/$/, '') + '.md';
}
var toggle = document.getElementById('themeToggle');
var root = document.documentElement;
function setTheme(t) {
root.setAttribute('data-theme', t);
try { localStorage.setItem('su-tool-theme', t); } catch(e) {}
}
toggle.addEventListener('click', function() {
setTheme(root.getAttribute('data-theme') === 'dark' ? 'light' : 'dark');
});
try {
var saved = localStorage.getItem('su-tool-theme');
if (saved) setTheme(saved);
else if (window.matchMedia('(prefers-color-scheme: light)').matches) setTheme('light');
} catch(e) {}
})();
(() => {
const dlg = document.getElementById('privacyDialog');
document.getElementById('privacyOpen').addEventListener('click', () => dlg.showModal());
document.getElementById('privacyClose').addEventListener('click', () => dlg.close());
})();
(() => {
const dlg = document.getElementById('creditsDialog');
document.getElementById('creditsOpen').addEventListener('click', () => dlg.showModal());
document.getElementById('creditsClose').addEventListener('click', () => dlg.close());
})();
// URL state encoding: see dev/tools/AGENTS.md → "URL state encoding".
const utf8Enc = new TextEncoder();
const utf8Dec = new TextDecoder();
const toBase64Url = (bytes) => {
let s = '';
for (const b of bytes) s += String.fromCharCode(b);
return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
};
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; }
};
document.addEventListener('DOMContentLoaded', async function() {
var textarea = document.getElementById('pemInput');
var outputContainer = document.getElementById('outputContainer');
var emptyState = document.getElementById('emptyState');
var statsDiv = document.getElementById('stats');
var toastEl = document.getElementById('toast');
var toastMsg = document.getElementById('toastMsg');
var shareBtn = document.getElementById('shareBtn');
var exampleBtn = document.getElementById('exampleBtn');
var clearBtn = document.getElementById('clearBtn');
var parseTimeout;
var toastTimeout;
if (location.hash.length > 1) {
var initialPem = await decodeState(location.hash.slice(1));
if (initialPem) {
textarea.value = initialPem;
processInput();
}
}
textarea.addEventListener('input', function() {
clearTimeout(parseTimeout);
parseTimeout = setTimeout(processInput, 300);
});
clearBtn.addEventListener('click', function() {
textarea.value = '';
window.history.replaceState({}, '', window.location.pathname + window.location.search);
processInput();
});
exampleBtn.addEventListener('click', function() {
textarea.value = '-----BEGIN CERTIFICATE-----\n'
+ 'MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n'
+ 'MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n'
+ 'd3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n'
+ 'QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n'
+ 'MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n'
+ 'b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n'
+ '9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n'
+ 'CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n'
+ 'nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n'
+ '43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n'
+ 'T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n'
+ 'gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n'
+ 'BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n'
+ 'TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n'
+ 'DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n'
+ 'hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n'
+ '06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n'
+ 'PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n'
+ 'YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n'
+ 'CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n'
+ '-----END CERTIFICATE-----';
processInput();
});
shareBtn.addEventListener('click', async function() {
var content = textarea.value.trim();
if (!content) { showToast('No content to share'); return; }
var encoded = await encodeState(content);
var shareUrl = window.location.origin + window.location.pathname + window.location.search + '#' + encoded;
window.history.replaceState({}, '', shareUrl);
try {
await navigator.clipboard.writeText(shareUrl);
showToast('Share link copied');
} catch {
showToast('Failed to copy share link');
}
});
function showToast(msg) {
clearTimeout(toastTimeout);
toastMsg.textContent = msg;
toastEl.style.display = 'flex';
toastEl.classList.remove('show');
void toastEl.offsetWidth;
toastEl.classList.add('show');
toastTimeout = setTimeout(function() {
toastEl.style.display = 'none';
toastEl.classList.remove('show');
}, 2000);
}
function processInput() {
var pemText = normalizeInput(textarea.value);
if (!pemText) {
outputContainer.innerHTML = '';
outputContainer.appendChild(emptyState);
emptyState.style.display = 'flex';
statsDiv.textContent = '0 certificates';
return;
}
emptyState.style.display = 'none';
var regex = /-----BEGIN CERTIFICATE-----[\s\S]+?-----END CERTIFICATE-----/g;
var matches = pemText.match(regex);
if (!matches) {
// Accept headerless input (e.g. base64 copied from Firefox/Chrome cert viewer
// or raw DER pasted as base64) by wrapping each block in PEM armor.
var wrapped = wrapHeaderlessBase64(pemText);
if (wrapped) {
matches = wrapped;
} else {
renderError('No valid PEM certificate blocks found.');
statsDiv.textContent = 'Error';
return;
}
}
try {
var parsedCerts = matches.map(function(pem) {
try {
var cert = forge.pki.certificateFromPem(pem);
return {
cert: cert,
pem: pem,
subjectDN: cert.subject.attributes.map(function(a) { return a.shortName + '=' + a.value; }).join(', '),
issuerDN: cert.issuer.attributes.map(function(a) { return a.shortName + '=' + a.value; }).join(', '),
fingerprint: getFingerprint(cert)
};
} catch (e) {
return null;
}
}).filter(function(c) { return c !== null; });
var sortedCerts = sortCertificates(parsedCerts);
renderCerts(sortedCerts);
statsDiv.textContent = parsedCerts.length + ' certificate' + (parsedCerts.length !== 1 ? 's' : '');
} catch (e) {
renderError('Error parsing certificates: ' + e.message);
}
}
function getFingerprint(cert) {
try {
var der = forge.asn1.toDer(forge.pki.certificateToAsn1(cert)).getBytes();
var md = forge.md.sha1.create();
md.update(der);
var hex = md.digest().toHex();
return hex.match(/.{2}/g).join(':').toUpperCase();
} catch (e) {
return 'Calculation failed';
}
}
function sortCertificates(certs) {
if (certs.length <= 1) return certs;
var pool = certs.slice();
var chain = [];
var leafIndex = pool.findIndex(function(candidate) {
return !pool.some(function(other) {
return other !== candidate && other.issuerDN === candidate.subjectDN;
});
});
var current = leafIndex >= 0 ? pool.splice(leafIndex, 1)[0] : pool.shift();
chain.push(current);
while (pool.length > 0) {
var issuerIndex = pool.findIndex(function(c) { return c.subjectDN === current.issuerDN; });
if (issuerIndex >= 0) {
current = pool.splice(issuerIndex, 1)[0];
chain.push(current);
} else {
chain.push.apply(chain, pool);
pool = [];
}
}
return chain;
}
function renderError(msg) {
outputContainer.innerHTML =
'<div class="error-box">' +
'<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="12" x2="12" y1="8" y2="12"/><line x1="12" x2="12.01" y1="16" y2="16"/></svg>' +
'<div><div class="error-title">Parsing Error</div>' + escapeHtml(msg) + '</div>' +
'</div>';
}
function renderCerts(certs) {
outputContainer.innerHTML = '';
certs.forEach(function(item, index) {
var cert = item.cert;
var isSelfSigned = item.subjectDN === item.issuerDN;
var now = new Date();
var notBefore = cert.validity.notBefore;
var notAfter = cert.validity.notAfter;
var isValid = now >= notBefore && now <= notAfter;
var daysRemaining = Math.ceil((notAfter - now) / (1000 * 60 * 60 * 24));
var role = 'Intermediate CA';
var roleClass = '';
if (index === 0 && certs.length > 1) { role = 'Leaf Certificate'; roleClass = 'leaf'; }
if (isSelfSigned) { role = 'Root CA'; roleClass = 'root'; }
if (certs.length === 1 && !isSelfSigned) { role = 'Certificate'; roleClass = ''; }
var cnField = cert.subject.getField('CN');
var commonName = cnField ? cnField.value : '(No CN)';
var orgField = cert.subject.getField('O');
var org = orgField ? orgField.value : null;
var issuerCnField = cert.issuer.getField('CN');
var issuerCN = issuerCnField ? issuerCnField.value : '(No Issuer CN)';
var altNameExt = cert.getExtension('subjectAltName');
var sans = [];
if (altNameExt && altNameExt.altNames) {
sans = altNameExt.altNames.map(function(a) {
if (a.type === 2) return a.value;
if (a.type === 7) return a.ip;
return a.value;
});
}
var card = document.createElement('div');
card.className = 'cert-card';
if (index > 0) {
var arrow = document.createElement('div');
arrow.className = 'chain-arrow';
card.appendChild(arrow);
}
var sansHtml = '';
if (sans.length > 0) {
sansHtml =
'<div>' +
'<div class="cert-label">Subject Alternative Names <span class="cert-label-count">(' + sans.length + ')</span></div>' +
'<div class="san-list">' +
sans.map(function(s) { return '<span class="san-tag">' + escapeHtml(s) + '</span>'; }).join('') +
'</div>' +
'</div>';
}
var bodyHtml =
'<div class="cert-card-head">' +
'<div>' +
'<div class="cert-cn-row">' +
'<div class="cert-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect width="18" height="11" x="3" y="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/></svg></div>' +
'<h3 class="cert-cn">' + escapeHtml(commonName) + '</h3>' +
'</div>' +
'<div class="cert-meta">' +
'<span class="cert-role ' + roleClass + '">' + role + '</span>' +
(org ? '<span class="cert-org">' + escapeHtml(org) + '</span>' : '') +
'</div>' +
'</div>' +
'<div class="cert-status-col">' +
'<div class="cert-status ' + (isValid ? 'valid' : 'invalid') + '">' +
'<div class="cert-status-dot"></div>' +
'<span>' + (isValid ? 'VALID' : 'INVALID') + '</span>' +
'</div>' +
'<div class="cert-expiry">' + (isValid ? 'Expires in ' + daysRemaining + ' days' : 'Expired or not yet valid') + '</div>' +
'</div>' +
'</div>' +
'<div class="cert-card-body">' +
'<div class="cert-dn-grid">' +
'<div>' +
'<div class="cert-label">Subject</div>' +
'<div class="dn-box">' + formatDN(item.subjectDN) + '</div>' +
'</div>' +
'<div>' +
'<div class="cert-label">Issuer</div>' +
'<div class="dn-box"><div class="dn-issuer-cn">' + escapeHtml(issuerCN) + '</div>' + formatDN(item.issuerDN) + '</div>' +
'</div>' +
'</div>' +
sansHtml +
'<div class="cert-details">' +
'<div class="cert-detail-col">' +
'<div class="cert-label">Validity Range</div>' +
'<div class="cert-dates">' +
'<div><span class="cert-dim">From: </span>' + notBefore.toUTCString() + '</div>' +
'<div><span class="cert-dim">To: </span>' + notAfter.toUTCString() + '</div>' +
'</div>' +
'</div>' +
'<div class="cert-detail-col">' +
'<div class="cert-label">Fingerprint (SHA-1)</div>' +
'<div class="fingerprint-box">' + item.fingerprint + '</div>' +
'<div class="cert-label" style="margin-top:10px">Serial</div>' +
'<div class="serial-value">' + cert.serialNumber + '</div>' +
'</div>' +
'</div>' +
'</div>';
card.insertAdjacentHTML('beforeend', bodyHtml);
outputContainer.appendChild(card);
});
}
function normalizeInput(raw) {
if (!raw) return '';
var text = raw;
// Peel surrounding matching quotes/backticks that often come from JSON/YAML/shell snippets.
var trimmed = text.trim();
if (trimmed.length >= 2) {
var first = trimmed.charAt(0);
var last = trimmed.charAt(trimmed.length - 1);
if ((first === '"' || first === "'" || first === '`') && first === last) {
text = trimmed.slice(1, -1);
}
}
// URL-decode if the input looks percent-encoded (e.g. cert copied from a URL query param
// where `+`, `/`, `=` and newlines show up as %2B/%2F/%3D/%0A). Only apply when decoding
// actually changes something and succeeds - otherwise fall back to the original text.
if (/%[0-9A-Fa-f]{2}/.test(text)) {
try {
var decoded = decodeURIComponent(text);
if (decoded !== text) text = decoded;
} catch (e) { /* leave text untouched on malformed sequences */ }
}
// Firefox / Chrome cert viewer URLs concatenate every cert in the chain as repeated
// query params: `about:certificate?cert=<b64>&cert=<b64>&cert=<b64>`. Strip any
// leading `…?<key>=` prefix (full URL or just the query part) and turn inter-cert
// `&<key>=` separators into blank lines so wrapHeaderlessBase64 splits them.
// Base64's alphabet is [A-Za-z0-9+/=], so `&` and `?` cannot appear inside a cert.
if (/[?&]\w+=/.test(text)) {
text = text.replace(/^[\s\S]*?\?\w+=/, '');
text = text.replace(/&\w+=/g, '\n\n');
}
// Unescape common literal escape sequences (e.g. `\n`, `\r`, `\t`) that appear when a PEM
// is pasted from a JSON string.
if (text.indexOf('\\n') !== -1 || text.indexOf('\\r') !== -1 || text.indexOf('\\t') !== -1) {
text = text.replace(/\\r\\n/g, '\n').replace(/\\n/g, '\n').replace(/\\r/g, '\n').replace(/\\t/g, '\t');
}
// Normalize line endings.
text = text.replace(/\r\n?/g, '\n');
return text.trim();
}
function wrapHeaderlessBase64(text) {
// Split on blank lines so multiple pasted base64 blobs are treated as separate certs.
var blocks = text.split(/\n\s*\n/).map(function(b) { return b.trim(); }).filter(Boolean);
if (blocks.length === 0) return null;
// Skip blocks that don't look like base64 instead of rejecting the whole input -
// a single piece of trailing junk (e.g. a stray `&utm_source=…` after a cert
// viewer URL) shouldn't lose every other valid cert.
var wrapped = [];
for (var i = 0; i < blocks.length; i++) {
var compact = blocks[i].replace(/\s+/g, '');
if (!/^[A-Za-z0-9+/]+=*$/.test(compact) || compact.length < 40) continue;
var lines = compact.match(/.{1,64}/g) || [];
wrapped.push('-----BEGIN CERTIFICATE-----\n' + lines.join('\n') + '\n-----END CERTIFICATE-----');
}
return wrapped.length > 0 ? wrapped : null;
}
function formatDN(dn) {
if (!dn) return '';
return escapeHtml(dn).replace(/([a-zA-Z]+=)/g, '<span class="dn-key">$1</span>');
}
function escapeHtml(text) {
if (!text) return '';
return text.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"').replace(/'/g, ''');
}
// Resizable splitter
(function() {
var splitter = document.getElementById('splitter');
var grid = splitter.parentElement;
var dragging = false;
splitter.addEventListener('mousedown', function(e) {
e.preventDefault();
dragging = true;
splitter.classList.add('active');
document.body.style.cursor = 'col-resize';
document.body.style.userSelect = 'none';
});
document.addEventListener('mousemove', function(e) {
if (!dragging) return;
var rect = grid.getBoundingClientRect();
var offset = e.clientX - rect.left;
var pct = (offset / rect.width) * 100;
pct = Math.max(15, Math.min(85, pct));
grid.style.gridTemplateColumns = pct + '% 12px ' + (100 - pct) + '%';
});
document.addEventListener('mouseup', function() {
if (!dragging) return;
dragging = false;
splitter.classList.remove('active');
document.body.style.cursor = '';
document.body.style.userSelect = '';
});
})();
});
</script>
</body>
</html>