Desktop only

Engineering tools are available only on desktop screens.

CRC calculator

CRC-8, CRC-16-CCITT, CRC-16-Modbus, and CRC-32 from hex or ASCII. For firmware frame validation, bootloader signatures, and protocol decoders.

Frame & CRC engine CRC-32 — 0xEDB88320

Input mode

Highlight algorithm

Input

Engineering notes

CRC-8 / SMBus: 0x07, init 0x00. Note: Dallas 1-Wire uses a different polynomial (0x31, reflected 0x8C) — not computed here.
CRC-16/XMODEM: 0x1021, init 0x0000. Common in XMODEM, BLE LE Audio, V.41.
CRC-16/CCITT-FALSE (a.k.a. IBM-3740, AUTOSAR-16): 0x1021, init 0xFFFF. Common in industrial automation, modems, MIL-STD-188-220.
CRC-16-Modbus: 0x8005 reflected, init 0xFFFF.
CRC-32: 0xEDB88320 reflected, init 0xFFFFFFFF, xor-out 0xFFFFFFFF (zip, Ethernet).

Input 123456789 → CRC-32 = 0xCBF43926, CRC-16/XMODEM = 0x31C3, CRC-16/CCITT-FALSE = 0x29B1, CRC-16-Modbus = 0x4B37, CRC-8 = 0xF4.
For custom polynomials, regenerate your table or use a reflected/non-reflected variant.

Live