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.

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.

What is the CRC-32 of the word "hello"?

The CRC-32 of the lowercase string "hello" is 3495352b in hexadecimal — a value you can use to confirm a CRC-32 implementation matches the standard.

CRC-32 Checksum Generator

Q: 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.

This tool computes the CRC-32 checksum of any text and shows it in both hexadecimal and unsigned decimal, updating live as you type. CRC-32 is the error-detecting checksum built into common file formats, so this is useful for verifying data integrity, comparing two pieces of text, or matching a checksum produced by another tool.

How it works

The generator uses the standard IEEE 802.3 polynomial (0xEDB88820) — the same CRC-32 used by zip, gzip and PNG. It precomputes a 256-entry lookup table from the polynomial, encodes your text to UTF-8 bytes, then runs the table-driven algorithm: starting from 0xFFFFFFFF, each byte updates the running value via crc = (crc >>> 8) XOR table[(crc XOR byte) & 0xFF], and the final value is XORed with 0xFFFFFFFF. This matches the output of standard CRC-32 libraries.

Example

Input	CRC-32 (hex)
`hello`	3495352b
`Gera Tools`	135c1033

So the text hello produces the checksum 3495352b, a well-known reference value you can use to confirm any CRC-32 implementation.

CRC-32 is an error-detection checksum, not a cryptographic hash. It is trivial to forge, so use it to spot accidental corruption but never for security — use SHA-256 when integrity against tampering matters. Everything is computed in pure JavaScript in your browser; nothing is uploaded.