Checksum · CRC Toolkit

File CRC Checksum Generator

Upload any file to compute CRC-8, CRC-16, CRC-32, and CRC-64 digests locally. Compare dozens of industry polynomials at once without sending data to a server. Need a quick text checksum? Switch to the text tool →

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CRC preset

Poly 0x04C11DB7, Init 0xFFFFFFFF, XOR 0xFFFFFFFF, RefIn Yes, RefOut Yes

Checksum result

Output format

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Variant details

Polynomial: 0x04C11DB7
Init: 0xFFFFFFFF
XorOut: 0xFFFFFFFF
RefIn: Yes
RefOut: Yes

When to use CRC?

CRCs are lightweight integrity checks suited for transportation protocols, firmware bundles, and packaging workflows. While they are not cryptographic, they are perfect for catching accidental corruption.

Common polynomial lengths:

9 bits (CRC-8)
17 bits (CRC-16)
33 bits (CRC-32)
65 bits (CRC-64)

Every calculation happens locally in your browser, so sensitive files remain private.