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 →
Upload a file
Click to browse or drag & drop files here
Files never leave your device.
Poly 0x04C11DB7, Init 0xFFFFFFFF, XOR 0xFFFFFFFF, RefIn Yes, RefOut Yes
Output format
Pick a file above to start computing.
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.