CRC Calculator

Calculate CRC (Cyclic Redundancy Check) checksums online. Supports CRC-8, CRC-16, CRC-32 with preset models (MODBUS, CCITT, USB, etc.) and custom polynomial parameters. Input HEX or ASCII text.

Input Mode

Preset CRC Model

Input Data

HEX format examples: 313233 or 31 32 33 or 0x31 0x32 0x33

CRC Width (bits)

Polynomial (POLY, hex)

Initial Value (INIT, hex)

XOROUT (hex)

REFIN (Input Reflected)

REFOUT (Output Reflected)