PyThaiNLP · bact · Mar 9, 2026 · Mar 9, 2026 · Mar 9, 2026 · Mar 9, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -52,6 +52,7 @@ The minimum requirement is now Python 3.9.
 - Callers raise `FileNotFoundError` with download instructions when
   a corpus path cannot be resolved (#1306)
 - Migrate build backend to `hatchling` (#1311)
+- Update HTTP links to HTTPS in source files and documentation
 
 ### Deprecated
 
@@ -63,6 +64,8 @@ The minimum requirement is now Python 3.9.
 - Duplicated entries in Volubilis dictionary (#1200)
 - Star imports (#1207)
 - `requests` dependency (#1211)
+- `pythainlp.util.is_native_thai` (deprecated since v5.0);
+  use `pythainlp.morpheme.is_native_thai` instead (#1315)
 
 ### Fixed
 

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -44,21 +44,21 @@ Please refer to our
   This is [to please Git][empty-line] and
   [to keep up with POSIX standard][posix].
 
-[pep8]: http://www.python.org/dev/peps/pep-0008/
+[pep8]: https://peps.python.org/pep-0008/
 [black]: https://github.com/ambv/black
 [naming]: https://namingconvention.org/python/
 [pep0498]: https://www.python.org/dev/peps/pep-0498/
-[dead-codes]: http://www.codinghorror.com/blog/2008/07/coding-without-comments.html
+[dead-codes]: https://blog.codinghorror.com/coding-without-comments/
 [issues]: https://github.com/pythainlp/pythainlp/issues
 [empty-line]: https://stackoverflow.com/questions/5813311/no-newline-at-end-of-file#5813359
 [posix]: https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline
 
 ### Version Control System
 
-- We use [Git](http://git-scm.com/) as our
-  [version control system](http://en.wikipedia.org/wiki/Revision_control),
+- We use [Git](https://git-scm.com/) as our
+  [version control system](https://en.wikipedia.org/wiki/Revision_control),
   so it may be a good idea to familiarize yourself with it.
-- You can start with the [Pro Git book](http://git-scm.com/book/) (free!).
+- You can start with the [Pro Git book](https://git-scm.com/book/) (free!).
 
 ### Commit Message
 
@@ -72,7 +72,7 @@ Please refer to our
   and several checks automatically. Click the "Details" link
   at the end of each check to see what needs to be fixed.
 
-[gitflow]: http://nvie.com/posts/a-successful-git-branching-model/
+[gitflow]: https://nvie.com/posts/a-successful-git-branching-model/
 
 ## Documentation
 
@@ -263,7 +263,7 @@ Thanks to all
   (Selection of Important Sentences in Thai Text Summarization
   Using a Hierarchical Model).
   Retrieved from
-  [http://digi.library.tu.ac.th/thesis/st/0192/](https://digital.library.tu.ac.th/tu_dc/frontend/Info/item/dc:124897)
+  <https://digital.library.tu.ac.th/tu_dc/frontend/Info/item/dc:124897>
 - **[Thai Discourse Treebank]** --
   Ponrawee Prasertsom, Apiwat Jaroonpol, Attapol T. Rutherford;
   The Thai Discourse Treebank: Annotating and Classifying Thai

diff --git a/README.md b/README.md
@@ -118,7 +118,7 @@ please cite the software as follows:
 > Phatthiyaphaibun, Wannaphong, Korakot Chaovavanich, Charin Polpanumas,
 > Arthit Suriyawongkul, Lalita Lowphansirikul, and Pattarawat Chormai.
 > “PyThaiNLP: Thai Natural Language Processing in Python”.
-> Zenodo, 2 June 2024. <http://doi.org/10.5281/zenodo.3519354>.
+> Zenodo, 2 June 2024. <https://doi.org/10.5281/zenodo.3519354>.
 
 with this BibTeX entry:
 

diff --git a/README_TH.md b/README_TH.md
@@ -136,7 +136,7 @@ PyThaiNLP ดาวน์โหลดข้อมูล (ดูแค็ตต
 > Phatthiyaphaibun, Wannaphong, Korakot Chaovavanich, Charin Polpanumas,
 > Arthit Suriyawongkul, Lalita Lowphansirikul, and Pattarawat Chormai.
 > “PyThaiNLP: Thai Natural Language Processing in Python”.
-> Zenodo, 2 June 2024. <http://doi.org/10.5281/zenodo.3519354>.
+> Zenodo, 2 June 2024. <https://doi.org/10.5281/zenodo.3519354>.
 
 โดยใช้รายการ BibTeX นี้:
 

diff --git a/docs/api/soundex.rst b/docs/api/soundex.rst
@@ -90,9 +90,9 @@ References
 
 .. [#metasound] Snae & Brückner. (2009). `Novel Phonetic Name Matching Algorithm with a Statistical Ontology for Analyzing Names Given in Accordance with Thai Astrology <https://pdfs.semanticscholar.org/3983/963e87ddc6dfdbb291099aa3927a0e3e4ea6.pdf>`_.
 
-.. [#udom83] Wannee Udompanich (1983). `String searching for Thai alphabet using Soundex compression technique <http://cuir.car.chula.ac.th/handle/123456789/48471>`_. Master Thesis. Chulalongkorn University, Thailand. วรรณี อุดมพาณิชย์. `การใช้หลักคำพ้องเสียง เพื่อค้นหาชุดอักขระภาษาไทยที่ออกเสียงเหมือนกัน <http://cuir.car.chula.ac.th/handle/123456789/48471>`_. วิทยานิพนธ์ (วท.ม.)--จุฬาลงกรณ์มหาวิทยาลัย, 2526.
+.. [#udom83] Wannee Udompanich (1983). `String searching for Thai alphabet using Soundex compression technique <https://cuir.car.chula.ac.th/handle/123456789/48471>`_. Master Thesis. Chulalongkorn University, Thailand. วรรณี อุดมพาณิชย์. `การใช้หลักคำพ้องเสียง เพื่อค้นหาชุดอักขระภาษาไทยที่ออกเสียงเหมือนกัน <https://cuir.car.chula.ac.th/handle/123456789/48471>`_. วิทยานิพนธ์ (วท.ม.)--จุฬาลงกรณ์มหาวิทยาลัย, 2526.
 
-.. [#lk82] Vichit Lorchirachoonkul. 1982. `A Thai soundex system <https://doi.org/10.1016/0306-4573(82)90003-6>`_. Information Processing & Management, 18(5):243–255. วิชิต หล่อจีระชุณห์กุล และ เจริญ คุวินทร์พันธุ์. `โปรแกรมการสืบค้นคำไทยตามเสียงอ่าน (Thai Soundex) <http://guru.sanook.com/1520/>`_.
+.. [#lk82] Vichit Lorchirachoonkul. 1982. `A Thai soundex system <https://doi.org/10.1016/0306-4573(82)90003-6>`_. Information Processing & Management, 18(5):243–255. วิชิต หล่อจีระชุณห์กุล และ เจริญ คุวินทร์พันธุ์. `โปรแกรมการสืบค้นคำไทยตามเสียงอ่าน (Thai Soundex) <https://guru.sanook.com/1520/>`_.
 
 .. [#prayut_and_somchaip] Prayut Suwanvisat, Somchai Prasitjutrakul. Thai-English Cross-Language Transliterated Word Retrieval using Soundex Technique. In 1998 [cited 2022 Sep 8]. Available from: https://www.cp.eng.chula.ac.th/~somchai/spj/papers/ThaiText/ncsec98-clir.pdf.
 

diff --git a/docs/api/spell.rst b/docs/api/spell.rst
@@ -48,11 +48,11 @@ The `NorvigSpellChecker` class is a fundamental component of the `pythainlp.spel
 DEFAULT_SPELL_CHECKER
 ~~~~~~~~~~~~~~~~~~~~~
 .. autodata:: DEFAULT_SPELL_CHECKER
-   :annotation: = Default reference of the standard NorvigSpellChecker, using word list data from the Thai National Corpus: http://www.arts.chula.ac.th/ling/tnc/
+   :annotation: = Default reference of the standard NorvigSpellChecker, using word list data from the Thai National Corpus: https://www.arts.chula.ac.th/ling/tnc3/
 
 The `DEFAULT_SPELL_CHECKER` is an reference to the `NorvigSpellChecker` class with default settings. It is pre-configured to use word list data from the Thai National Corpus, making it a reliable choice for general spell-checking tasks.
 
 References
 ----------
 
-.. [#norvig_spellchecker]  Peter Norvig (2007). `How to Write a Spelling Corrector <http://norvig.com/spell-correct.html>`_.
+.. [#norvig_spellchecker]  Peter Norvig (2007). `How to Write a Spelling Corrector <https://norvig.com/spell-correct.html>`_.
diff --git a/docs/api/tag.rst b/docs/api/tag.rst
@@ -217,7 +217,7 @@ Named Entity tag                Examples
  ORGANIZATION                   กรมวิทยาศาสตร์การแพทย์, อย.
  PERSON                         น.พ.จรัล, นางประนอม ทองจันทร์
  PHONE                          1200, 0 2670 8888
- URL                            http://www.bangkokhealth.com/
+ URL                            https://www.bangkokhealth.com/
  ZIP                            10400, 11130
  Money                          2.7 ล้านบาท, 2,000 บาท
  LAW                            พ.ร.บ.โรคระบาด พ.ศ.2499, รัฐธรรมนูญ

diff --git a/docs/api/transliterate.rst b/docs/api/transliterate.rst
@@ -61,7 +61,7 @@ This section includes multiple transliteration engines designed to suit various
 References
 ----------
 
-.. [#rtgs_transcription] Nitaya Kanchanawan. (2006). `Romanization, Transliteration, and Transcription for the Globalization of the Thai Language. <http://www.royin.go.th/wp-content/uploads/royin-ebook/276/FileUpload/758_6484.pdf>`_
+.. [#rtgs_transcription] Nitaya Kanchanawan. (2006). `Romanization, Transliteration, and Transcription for the Globalization of the Thai Language. <http://legacy.orst.go.th/wp-content/uploads/royin-ebook/276/FileUpload/758_6484.pdf>`_
         The Journal of the Royal Institute of Thailand.
 
 The `pythainlp.transliterate` module offers a comprehensive set of tools and engines for transliterating Thai text into Romanized form. Whether you need a simple transliteration, specific engines for accurate representation, or phonetic rendering, this module provides a wide range of options. Additionally, the module references a publication that highlights the significance of Romanization, Transliteration, and Transcription in making the Thai language accessible to a global audience.
diff --git a/docs/api/wangchanberta.rst b/docs/api/wangchanberta.rst
@@ -47,4 +47,4 @@ Modules
 References
 ----------
 
-.. [#Lowphansirikul_2021] Lowphansirikul L, Polpanumas C, Jantrakulchai N, Nutanong S. WangchanBERTa: Pretraining transformer-based Thai Language Models. `ArXiv:2101.09635 <http://arxiv.org/abs/2101.09635>`_ [Internet]. 2021 Jan 23 [cited 2021 Feb 27].
+.. [#Lowphansirikul_2021] Lowphansirikul L, Polpanumas C, Jantrakulchai N, Nutanong S. WangchanBERTa: Pretraining transformer-based Thai Language Models. `ArXiv:2101.09635 <https://arxiv.org/abs/2101.09635>`_ [Internet]. 2021 Jan 23 [cited 2021 Feb 27].
diff --git a/docs/conf.py b/docs/conf.py
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 # Configuration file for the Sphinx documentation builder.
-# http://www.sphinx-doc.org/en/master/config
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
 
 import os
 import sys

diff --git a/docs/notes/license.rst b/docs/notes/license.rst
@@ -14,7 +14,7 @@ License
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
 
-       http://www.apache.org/licenses/LICENSE-2.0
+       https://www.apache.org/licenses/LICENSE-2.0
 
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,

diff --git a/pythainlp/corpus/corpus_license.md b/pythainlp/corpus/corpus_license.md
@@ -67,7 +67,7 @@ and released under
 A Thai word list from ICU (International Components for Unicode) project
 (icubrk_th.txt) is copyrighted by Unicode, Inc. and others.,
 released under **Unicode License Agreement - Data Files and Software (2016)**
-<http://www.unicode.org/copyright.html>
+<https://www.unicode.org/copyright.html>
 
 Original data:
 <https://github.com/unicode-org/icu/blob/main/icu4c/source/data/brkitr/dictionaries/thaidict.txt>

diff --git a/pythainlp/corpus/icubrk_th.txt b/pythainlp/corpus/icubrk_th.txt
@@ -1,6 +1,6 @@
 # SPDX-FileType: TEXT
 # SPDX-FileCopyrightText: Copyright (C) 2016 and later: Unicode, Inc. and others.
-# SPDX-FileCopyrightText: License & terms of use: http://www.unicode.org/copyright.html
+# SPDX-FileCopyrightText: License & terms of use: https://www.unicode.org/copyright.html
 # SPDX-FileCopyrightText: Copyright (c) 2006-2015 International Business Machines Corporation,
 # SPDX-FileCopyrightText: Apple Inc., and others. All Rights Reserved.
 # SPDX-License-Identifier: Unicode-DFS-2016

diff --git a/pythainlp/corpus/wordnet.py b/pythainlp/corpus/wordnet.py
@@ -436,7 +436,7 @@ def morphy(form: str, pos: Optional[str] = None) -> str:
 
 def custom_lemmas(tab_file: Union[str, IO[str]], lang: str) -> None:
     """This function reads a custom tab file
-    (see: http://compling.hss.ntu.edu.sg/omw/)
+    (see: https://omwn.org/)
     containing mappings of lemmas in the given language.
 
     :param tab_file: Tab file as a file or file-like object

diff --git a/pythainlp/morpheme/thaiwordcheck.py b/pythainlp/morpheme/thaiwordcheck.py
@@ -9,7 +9,7 @@
 References
 ----------
 - ทีมงานทรูปลูกปัญญา 2015. ลักษณะของคำไทยแท้ \
-    http://www.trueplookpanya.com/learning/detail/30589-043067
+    https://www.trueplookpanya.com/learning/detail/30589-043067
 - วารุณี บำรุงรส 2010. คำไทยแท้ https://www.gotoknow.org/posts/377619
 
 """

diff --git a/pythainlp/soundex/udom83.py b/pythainlp/soundex/udom83.py
@@ -8,7 +8,7 @@
 using Soundex compression technique. Master Thesis
 of Department of Computer Engineering Graduate
 School, Chulalongkorn University, 1983.
-http://cuir.car.chula.ac.th/handle/123456789/48471
+https://cuir.car.chula.ac.th/handle/123456789/48471
 
 Python implementation:
 by Korakot Chaovavanich

diff --git a/pythainlp/spell/pn.py b/pythainlp/spell/pn.py
@@ -3,7 +3,7 @@
 Default spelling dictionary is based on Phupha: Thai Word Frequency Dataset,
 filtered with Royal Society of Thailand word list.
 
-Based on Peter Norvig's Python code from http://norvig.com/spell-correct.html
+Based on Peter Norvig's Python code from https://norvig.com/spell-correct.html
 """
 
 from __future__ import annotations

diff --git a/pythainlp/tag/_tag_perceptron.py b/pythainlp/tag/_tag_perceptron.py
@@ -29,7 +29,7 @@ class AveragedPerceptron:
     """An averaged perceptron, as implemented by Matthew Honnibal.
 
     See more implementation details here:
-        http://honnibal.wordpress.com/2013/09/11/a-good-part-of-speechpos-tagger-in-about-200-lines-of-python/
+        https://honnibal.wordpress.com/2013/09/11/a-good-part-of-speechpos-tagger-in-about-200-lines-of-python/
     """
 
     weights: dict[str, dict[str, float]]
@@ -104,7 +104,7 @@ class PerceptronTagger:
     """Greedy Averaged Perceptron tagger, as implemented by Matthew Honnibal.
 
     See more implementation details here:
-        http://honnibal.wordpress.com/2013/09/11/a-good-part-of-speechpos-tagger-in-about-200-lines-of-python/
+        https://honnibal.wordpress.com/2013/09/11/a-good-part-of-speechpos-tagger-in-about-200-lines-of-python/
 
     >>> from pythainlp.tag import PerceptronTagger
     >>> tagger = PerceptronTagger()

diff --git a/pythainlp/tokenize/tcc.py b/pythainlp/tokenize/tcc.py
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 """The implementation of tokenizer according to Thai Character Clusters (TCCs)
 rules proposed by `Theeramunkong et al. 2000. \
-    <http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.59.2548>`_
+    <https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.59.2548>`_
 
 Credits:
     * TCC: Jakkrit TeCho

diff --git a/pythainlp/tokenize/tcc_p.py b/pythainlp/tokenize/tcc_p.py
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 """The implementation of tokenizer according to Thai Character Clusters (TCCs)
 rules proposed by `Theeramunkong et al. 2000. \
-    <http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.59.2548>`_
+    <https://doi.org/10.1145/355214.355225>`_
 and improved rules that are used in newmm
 
 Credits:

diff --git a/pythainlp/translate/tokenization_small100.py b/pythainlp/translate/tokenization_small100.py
@@ -2,7 +2,7 @@
 # SPDX-FileType: SOURCE
 # SPDX-License-Identifier: Apache-2.0
 
-# Copyright (c) 2022 Idiap Research Institute, http://www.idiap.ch/
+# Copyright (c) 2022 Idiap Research Institute, https://www.idiap.ch/
 # Written by Alireza Mohammadshahi <alireza.mohammadshahi@idiap.ch>
 # This is a modified version of https://github.com/huggingface/transformers/blob/main/src/transformers/models/m2m_100/tokenization_m2m_100.py
 # which owns by Fariseq Authors and The HuggingFace Inc. team.
@@ -12,7 +12,7 @@
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
-#     http://www.apache.org/licenses/LICENSE-2.0
+#     https://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,

diff --git a/pythainlp/util/__init__.py b/pythainlp/util/__init__.py
@@ -24,7 +24,6 @@
     "find_keyword",
     "find_profanity",
     "ipa_to_rtgs",
-    "is_native_thai",
     "isthai",
     "isthaichar",
     "longest_common_subsequence",
@@ -138,7 +137,6 @@
     thai_word_tone_detector,
 )
 from pythainlp.util.thai_lunar_date import th_zodiac, to_lunar_date
-from pythainlp.util.thaiwordcheck import is_native_thai
 from pythainlp.util.time import thaiword_to_time, time_to_thaiword
 from pythainlp.util.trie import Trie, dict_trie
 from pythainlp.util.wordtonum import text_to_num, thaiword_to_num, words_to_num

diff --git a/pythainlp/util/numtoword.py b/pythainlp/util/numtoword.py
@@ -4,7 +4,7 @@
 """Convert number value to Thai read out
 
 Adapted from
-http://justmindthought.blogspot.com/2012/12/code-php.html
+https://justmindthought.blogspot.com/2012/12/code-php.html
 https://suksit.com/post/writing-bahttext-in-php/
 """
 

diff --git a/pythainlp/util/strftime.py b/pythainlp/util/strftime.py
@@ -186,7 +186,7 @@ def thai_strftime(
 
         * Python
           https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior
-        * C http://www.cplusplus.com/reference/ctime/strftime/
+        * C https://en.cppreference.com/w/cpp/chrono/c/strftime
         * GNU https://metacpan.org/pod/POSIX::strftime::GNU
         * Linux https://linux.die.net/man/3/strftime
         * OpenBSD https://man.openbsd.org/strftime.3
@@ -195,7 +195,7 @@ def thai_strftime(
           https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/strftime.3.html
         * PHP https://secure.php.net/manual/en/function.strftime.php
         * JavaScript's implementation https://github.com/samsonjs/strftime
-        * strftime() quick reference http://www.strftime.net/
+        * strftime() quick reference https://strftime.net/
 
     :param datetime dt_obj: an instantiatetd object of
                             :mod:`datetime.datetime`

diff --git a/pythainlp/util/thaiwordcheck.py b/pythainlp/util/thaiwordcheck.py