PyPI · #992 most downloaded on PyPI

cchardet

2.3.014M downloads/moPyYoshi/cChardet ↗New releases in your daily digest, changelog included.

cChardet is high speed universal character encoding detector.

Last release 19 days ago
15 Sep 2026
Ships unpredictably
gaps range from 8 days to 3.6 years
Most releases are documented
notes for 15 of 18 stable releases
Nothing withdrawn
no release was ever pulled
13 years old
22 releases · first in 2013

Release timeline

22 releases since 2013

2013201520172019

Releases

2.3.015 Sept 2026
Supports free-threaded CPython 3.14 without re-enabling the GIL, including dedicated tests, wheels, and before/after performance measurements.
What’s changed

Supports free-threaded CPython 3.14 without re-enabling the GIL, including dedicated tests, wheels, and before/after performance measurements.

Accelerates uchardet language-model lookups with per-detector code-point caches while preserving candidate results.

Caches multibyte candidate analysis and eliminates duplicate known-language candidates during finalization.

Reuses the single-byte filtering buffer for incremental input.

Adds a native C API benchmark and an exact candidate-output comparison tool.

See CHANGES.md for the full release notes.
Open source →
Additional notes
Support free-threaded CPython 3.14 without re-enabling the GIL, including dedicated tests, wheels, and before/after performance measurements

Accelerate uchardet language-model lookups with per-detector code-point caches while preserving candidate results

Cache multibyte candidate analysis and eliminate duplicate known-language candidates during finalization

Reuse the single-byte filtering buffer for incremental input

Add a native C API benchmark and an exact candidate-output comparison tool
Open source →

One column per quarter.

Support Python 3.11, 3.12, 3.13, and 3.14; drop Python 3.10 and earlier

What’s changed

Support Python 3.11, 3.12, 3.13, and 3.14; drop Python 3.10 and earlier
Modernize development, testing, and packaging around uv, current Cython, and current packaging standards
Update the maintained PyYoshi/uchardet fork while preserving the cChardet-compatible API
Improve UTF-8 validation and GB18030 candidate ranking
Return language and confidence information from detection APIs
Add detect_all() for ranked encoding and language candidates
Add optional language weights to the Python API and CLI
Accept bytes, bytearray, and memoryview; add max_bytes to bound detection work
Stream input in cchardetect, with JSON output and configurable chunk and byte limits
Expose early-completion state and safely handle inputs larger than uchardet’s internal 32-bit length
Ship PEP 561 type information
Add reproducible performance and accuracy comparisons, native sanitizer coverage, arbitrary-byte consistency tests, and installed-wheel smoke tests
Build and test supported Python versions on Linux, macOS, and Windows, including ARM64 wheel coverage

See CHANGES.md for the complete release history.

Open source →

Additional notes

Support Python 3.11, 3.12, 3.13, and 3.14, and drop support for Python 3.10 and earlier versions
Modernize development, testing, and packaging around uv, current Cython, and current Python packaging standards
Update to the maintained PyYoshi/uchardet fork while preserving the existing cChardet-compatible API
Improve UTF-8 validation and GB18030 candidate ranking in the bundled uchardet
Return language and confidence information from the detection APIs
Add detect_all() for inspecting ranked encoding and language candidates
Add optional language weights to the Python API and CLI without changing the default candidate ranking
Accept bytes, bytearray, and memoryview inputs, and add max_bytes to bound detection work without slicing the input
Stream input in cchardetect, with JSON output and configurable chunk and byte limits
Expose uchardet's early-completion state for incremental detection and safely chunk inputs larger than its internal 32-bit length
Ship PEP 561 type information for the public Python and Cython-extension APIs
Add reproducible performance and accuracy comparisons for cChardet, chardet, and charset-normalizer, including their available native accelerators
Build and test distributions across supported Python versions on Linux, macOS, and Windows, including ARM64 wheel coverage
Add native sanitizer, arbitrary-byte consistency, and installed-wheel smoke tests

Open source →

2.2.0a26 Jun 2024pre-release

chore: update CIBW_TEST_COMMAND by @PyYoshi in #96

What's Changed

chore: update CIBW_TEST_COMMAND by @PyYoshi in #96
Improve test codes by @PyYoshi in #97
chore: update CIBW_TEST_COMMAND by @PyYoshi in #98
chore(github actions): cibuildwheel 上でのテストを一時的に無効化する by @PyYoshi in #99
bump to v2.2.0-alpha.2 by @PyYoshi in #100

Full Changelog: 2.2.0-alpha.1...2.2.0-alpha.2

Open source →

Additional notes

Improve test codes and CI/CD workflows

Open source →

2.1.727 Oct 2020

support Python 3.9 Thank you, decaz. ( #65 ) drop support for Python 3.5

support Python 3.9
- Thank you, decaz. (#65)
drop support for Python 3.5

Open source →

Additional notes

support Python 3.9
drop support for Python 3.5

Open source →

2.1.616 Mar 20202 sources agree

drop support for Python 2.7 support Github Actions update dev-dependencies

drop support for Python 2.7
support Github Actions
update dev-dependencies

Open source →

2.1.518 Nov 2019

update language models (uchardet)

update language models (uchardet)
add iso8859-2 test but disabled it
support Python 3.8
drop support for Python 3.4

Open source →

2.1.426 Sept 2018

disable LTO because become poor performance

disable LTO because become poor performance

Open source →

2.1.326 Sept 2018

- support Python 3.7

support Python 3.7

Open source →

2.1.11 Jul 2017

fix that different results with different chuck sizes

fix that different results with different chuck sizes
fix that assignments to nsSMState in nsCodingStateMachine result in unspecified behavior
include COPYING in package

Open source →

2.1.015 May 2017

add cchardetect CLI script (#30)\@craigds

add cchardetect CLI script (#30)@craigds

Open source →

2.0.125 Apr 2017

fix an issue where UTF-8 with a BOM would not be detected as UTF-8-SIG (fix #28)

fix an issue where UTF-8 with a BOM would not be detected as UTF-8-SIG (fix #28)
pass NULL Byte to feed() / detect() (fix #27)

Open source →

2.0.06 Apr 2017

Replace uchardet-enhanced to uchardet

Changes:

Replace uchardet-enhanced to uchardet
Fix buffer overflow
Fix memory leak
Improve tests
Improve UniversalDetector
Change License

Good Luck, Have Fun 😄

Open source →

Additional notes

Improve tests

Open source →

2.0a45 Apr 2017pre-release

Update uchardet repo (Fix buffer overflow)

Update uchardet repo (Fix buffer overflow)

Open source →

2.0a329 Mar 2017pre-release

Implement UniversalDetector (like chardet)

Implement UniversalDetector (like chardet)

Open source →

2.0a228 Mar 2017pre-release

Update uchardet repo (Fix memory leak)

Update uchardet repo (Fix memory leak)

Open source →

1.1.326 Feb 2017

- Support AArch64

Support AArch64

Open source →

1.1.28 Jan 2017

- Support Python 3.6

Support Python 3.6

Open source →

1.1.14 Nov 2016

Remove detect function in \_cchardet.pyx

Use len() function (9e61cb9e96b138b0d18e5f9e013e144202ae4067)
Remove detect function in _cchardet.pyx (25b581294fc0ae8f686ac9972c8549666766f695)
Support manylinux1 wheel

Open source →

1.1.017 Oct 2016

- Add Detector class - Improve unit tests

Add Detector class
Improve unit tests

Open source →

1.0.07 Sept 2015

Nothing published for this version

0.3.54 Aug 2013

Nothing published for this version

0.3.43 Aug 2013

Nothing published for this version

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