Is my text sent to a server?

No. The CRC-32 is computed in pure JavaScript entirely in your browser. Your text never leaves your device and nothing is uploaded.

Is CRC-32 a cryptographic hash?

No. CRC-32 is an error-detecting checksum designed to catch accidental data corruption, not a cryptographic hash. It is trivial to forge, so never use it for security, passwords, or integrity against tampering — use SHA-256 for that.

Which CRC-32 variant does this use?

It uses the standard IEEE 802.3 polynomial (0xEDB88820), the same CRC-32 used by zip, gzip, and PNG, so results match those formats and most CRC-32 libraries.

CRC-32 Checksum Generator

CRC-32 checksum generator

Paste any text and instantly get its CRC-32 checksum in both hexadecimal and unsigned decimal. The value updates as you type.

This tool uses the standard IEEE 802.3 polynomial (0xEDB88820) — the same CRC-32 used by zip, gzip, and PNG — so the result matches those formats and common CRC-32 libraries. Everything is computed in pure JavaScript in your browser; nothing is uploaded.

CRC-32 is an error-detection checksum, not a cryptographic hash. Use it to spot accidental corruption, but never for security — use SHA-256 when integrity against tampering matters.