BrotliCFFI
This library contains Python CFFI bindings for the reference Brotli encoder/decoder, available here. This allows Python software to use the Brotli compression algorithm directly from Python code.
Install from PyPI:
$ python -m pip install brotlicffiInstall from Conda:
$ conda install -c conda-forge brotlicffiTo use it simply, try this:
import brotlicffi
data = brotlicffi.decompress(compressed_data)More information can be found in the documentation.
Using BrotliCFFI in Projects
The API is 100% compatible with the Brotli Python C bindings. We recommend installing the C bindings on CPython and the CFFI bindings everywhere else (PyPy, etc)
Essentially you use requirements like this:
install_requires=[ "brotli; platform_python_implementation == 'CPython'", "brotlicffi; platform_python_implementation != 'CPython'" ]
and then import the correct Brotli library like so:
try: import brotlicffi as brotli except ImportError: import brotli
We provide an example project that shows how to use both libraries together to support Brotli with multiple Python implementations.
License
The source code of BrotliCFFI is available under the MIT license. Brotli itself is made available under the Version 2.0 of the Apache Software License. See the LICENSE and libbrotli/LICENSE files for more information.
Changelog
1.2.1.0 (2026-10-21)
Upgraded libbrotli to v1.2.1, which remediates CVE-2026-111497, an out-of-bounds write that permits remote code execution.
Changed one-shot decompress() and streaming Decompressor.process() / Decompressor.decompress() to raise brotlicffi.error for trailing bytes after a complete Brotli stream, including calls without an output limit. Previously tolerated input is now rejected, and any output produced during the failing call is discarded. This prevents infinite drain loops in streaming consumers.
1.2.0.2 (2026-08-21)
Fixed a bug where Decompressor.decompress() could leave stale unconsumed input behind after fully consuming a chunk of compressed data, causing subsequent calls to fail or re-process old data.
Since cibuildwheel dropped support, this release does not include Python 3.8 wheels.
1.2.0.1 (2026-03-05)
Added support for the free-threaded build of Python 3.14.
Concurrent sharing of Compressor or Decompressor objects now raises an exception.
1.2.0.0 (2025-11-21)
Upgraded libbrotli to v1.2.0.
Added output_buffer_limit parameter to Decompressor.decompress() and Decompressor.process() methods to allow mitigation of unexpectedly large output. This addresses potential security concerns where maliciously crafted compressed data could result in excessive memory usage during decompression.
1.1.0.0 (2023-09-14)
Upgraded libbrotli to v1.1.0
Added explicit support for Python 3.10, 3.11, and 3.12
Removed support for Python 2.7, 3.5, and 3.6
1.0.9.2 (2021-04-06)
Added manylinux_aarch64 wheels
1.0.9.1 (2021-01-27)
Avoid byte/string comparison warning in error message construction
1.0.9.0 (2021-01-20)
Updated to v1.0.9 of the Brotli library
Library version now follows Brotli version
Removed the dictionary parameter from compress and Compressor
NOTE: Python 2.7 wheels for Windows likely won’t work until google/brotli#848 is resolved
0.8.0 (2020-11-30)
Renamed the package on PyPI to brotlicffi, all further updates will be published to the new package. Using the brotlipy is deprecated.
Changed the importable namespace from brotli to brotlicffi to no longer conflict with the Brotli PyPI package.
Added process() method to Compressor and Decompressor.
Added is_finished() method to Decompressor.
0.7.0 (2017-05-30)
Update to v0.6.0 of the Brotli library.
0.6.0 (2016-09-08)
Resolved a bug where decompress() would return an empty bytestring instead of erroring if the provided bytestring was small enough.
Added the finish() method to the streaming decompressor.
0.5.1 (2016-08-17)
Update to v0.5.2 of the Brotli library.
Add new exception type (Error).
Add compatibility with C++ brotli library by aliasing Error to error.
Extra error checking of input parameters to the compressor.
0.5.0 (2016-08-16)
Update to v0.5.0 of the Brotli library.
Extend one-shot compression API to include all control parameters.
Added streaming/incremental compression API.
Added flags to control compression mode.
0.4.0 (2016-08-01)
Update to v0.4.0 of the Brotli library.
0.3.0 (2016-05-11)
Update to v0.3.0 of the Brotli library.
0.2.0 (2015-10-05)
Fix broken brotli.compress support on Windows.
0.1.3 (2015-10-05)
Added basic for brotli.compress through a C wrapper included in this library.
2 maintainers
Metadata
2 maintainers
Release files for brotlicffi 1.2.1.0
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| Tags | CPython 3.9 Linux glibc 2.17+ x86-64 Linux glibc 2.28+ x86-64 abi3 |
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| Size | 1.5 MB |
| Tags | CPython 3.9 Linux glibc 2.17+ ARM64 Linux glibc 2.28+ ARM64 abi3 |
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SHA-256 checksum How to use checksums |
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| Download URL | brotlicffi-1.2.1.0-cp39-abi3-macosx_11_0_arm64.whl |
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| Size | 439.2 kB |
| Tags | CPython 3.9 abi3 macOS 11.0+ ARM64 |
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Transparency logSecurity for brotlicffi 1.2.1.0
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