XCOM.DEV

Tool · checksums · client-side

CRC Calculator

Check your frame integrity.

Compute CRCs of arbitrary data against common algorithms — CRC-8, CRC-16 (CCITT, MODBUS, XMODEM, ARC/IBM), CRC-32 and CRC-32C. Enter text or hex; each row shows the parameters actually used so you can verify what was computed.

Algorithm CRC (hex) CRC (dec) Parameters (width/poly/init/refin-refout/xorout)

Tip: the classic “123456789” check vector is pre-filled. CRC-32 of that is 0xCBF43926.

About

CRCs detect accidental frame corruption (bit flips, dropped bytes). They are not cryptographic — for integrity against tampering use a MAC/HMAC. All computation happens locally; nothing is uploaded.