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Hashing & Checksums

All Checksums Generator

Compute 176 CRC, Adler, and Fletcher checksums of text at once. Filter by bit width to identify an unknown CRC variant.

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Compute 176 CRC, Adler, and Fletcher checksums of text at once. Filter by bit width to identify an unknown CRC variant.

This tool runs open-source code from CyberChef by GCHQ (Apache License 2.0). See open-source credits.

The generator applies its CRC, Adler, and Fletcher variants to the same input.

The result contains one checksum per line, with algorithm names when Include names is enabled.

  • Identify the CRC-16 variant in a Modbus, XMODEM, or vendor serial protocol.

Sources: CRC RevEng: catalogue of parametrised CRC algorithms

Compare checksum variants for 123456789

Input: 123456789

Settings: Length (bits) 32; Include names on

Result: 30 lines, one per 32-bit algorithm. They include Adler-32: 091e01de, CRC-32: cbf43926, CRC-32/C: e3069283, CRC-32/MPEG-2: 0376e6e7, and Fletcher-32: df09d509.

Use a second input to distinguish algorithms that happen to match on one sample.

Filter checksum widths and recognize aliases

  1. Enter the source text.
  2. Choose Length (bits) to filter by checksum width.
  3. Keep Include names enabled when comparing candidate algorithms.
  • Text input does not decode hex or load file bytes.
  • Equal widths do not make checksum algorithms interchangeable.
  • Checksums detect accidental changes but do not authenticate data.

Questions

Why do several CRC names show the same value?

Some names are aliases for the same algorithm. A matching value alone cannot distinguish those names.