anycrc
The fastest general Python CRC Library
Decision gist · record as of 2026-08-14
Yes. The package is actively maintained, has no known vulnerabilities, uses a permissive license, and solves a specific problem (fast, flexible CRC calculation) with a clean API. Medium install friction is acceptable given the compiled-wheel distribution across platforms. Suitable for any project needing CRC validation beyond Python's built-in hashlib.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later; bitarray is a runtime dependency for bit-level operations.
- Medium install friction due to compiled wheels for multiple platforms and Python versions.
- Actively maintained with recent commits; last release 143 days ago and repository not archived.
License · maintenance · safety
Zlib (permissive) — Zlib license is permissive and places minimal restrictions on use, modification, or distribution in both open-source and proprietary contexts.
last release 2026-03-24 (143 days) · last repo commit 2026-08-01 · 5 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 115,922 downloads/mo, #12,232 on PyPI
Alternatives
Verify before relying
pip install anycrc
import anycrc
crc32 = anycrc.Model('CRC32-MPEG-2')
result = crc32.calc(b'Hello World!')
print(result) # 2498069329- Whether the benchmark comparison (26.65 GiB/s vs other libraries) reflects current performance or was from an earlier version
- Whether bitarray dependency is optional or required for all use cases
What it is and what it does
anycrc is a CRC (cyclic redundancy check) calculation library that supports arbitrary bit widths up to 64 bits. It provides both pre-built models for standard CRC variants (like CRC32-MPEG-2) and the ability to define custom CRC parameters (polynomial, initial value, reflection flags, XOR output). The package is designed for performance and supports three main workflows: calculating a CRC over complete data in one call, updating a CRC incrementally by processing data in chunks, and combining two independently calculated CRCs into a single result.
The library depends on bitarray for bit-level operations, particularly when working with data that is not byte-aligned. It supports both byte-oriented and bit-oriented interfaces, with separate methods for each (calc/calc_bits, combine/combine_bits). The package is actively maintained and provides a command-line interface to list available pre-built CRC models.
Use it for
- Verify data integrity in network protocols or file formats that specify standard CRC checksums like CRC32-MPEG-2
- Implement custom CRC validation for proprietary or legacy systems with non-standard polynomial or parameter configurations
- Process large files or streams by calculating CRC incrementally in chunks to avoid loading entire data into memory
- Combine CRC results from distributed or parallel processing where partial checksums need to be merged into a final result
- Work with bit-level data alignment in protocols or formats where CRC must be calculated over a non-byte-aligned portion of data
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is actively maintained, has no known vulnerabilities, uses a permissive license, and solves a specific problem (fast, flexible CRC calculation) with a clean API. Medium install friction is acceptable given the compiled-wheel distribution across platforms. Suitable for any project needing CRC validation beyond Python's built-in hashlib.
Install
anycrc on PyPI
Before you install
Medium install friction due to compiled wheels for multiple platforms and Python versions. Actively maintained with recent commits; last release 143 days ago and repository not archived.
Requires Python 3.8 or later; bitarray is a runtime dependency for bit-level operations.
License in practice
Zlib license is permissive and places minimal restrictions on use, modification, or distribution in both open-source and proprietary contexts.
Quickstart
pip install anycrc
import anycrc
crc32 = anycrc.Model('CRC32-MPEG-2')
result = crc32.calc(b'Hello World!')
print(result) # 2498069329Verify before relying
- Whether the benchmark comparison (26.65 GiB/s vs other libraries) reflects current performance or was from an earlier version
- Whether bitarray dependency is optional or required for all use cases
Package facts
| License | Zlib permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | 1 packagebitarray |
| Maintenance | Actively maintained 143 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 115,922 / month, #12,232 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
Evidence: anycrc-2.0.0-cp310-cp310-macosx_10_9_x86_64.whl; anycrc-2.0.0-cp310-cp310-macosx_11_0_arm64.whl; anycrc-2.0.0-cp310-cp310-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl; anycrc-2.0.0-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; anycrc-2.0.0-cp310-cp310-musllinux_1_2_aarch64.whl; anycrc-2.0.0-cp310-cp310-musllinux_1_2_x86_64.whl; anycrc-2.0.0-cp310-cp310-win32.whl; anycrc-2.0.0-cp310-cp310-win_amd64.whl; anycrc-2.0.0-cp310-cp310-win_arm64.whl; anycrc-2.0.0-cp311-abi3-macosx_10_9_x86_64.whl; anycrc-2.0.0-cp311-abi3-macosx_11_0_arm64.whl; anycrc-2.0.0-cp311-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl; anycrc-2.0.0-cp311-abi3-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; anycrc-2.0.0-cp311-abi3-musllinux_1_2_aarch64.whl; anycrc-2.0.0-cp311-abi3-musllinux_1_2_x86_64.whl; anycrc-2.0.0-cp311-abi3-win32.whl; anycrc-2.0.0-cp311-abi3-win_amd64.whl; anycrc-2.0.0-cp311-abi3-win_arm64.whl; anycrc-2.0.0-cp314-cp314t-macosx_10_15_x86_64.whl; anycrc-2.0.0-cp314-cp314t-macosx_11_0_arm64.whl
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See also crc · fastcrc · crcmod · crccheck · libscrc · crcengine · crc32c · filehash · bitmath · spookyhash