CRC Online Calculator

Calculate various CRC checksums, supporting CRC-8, CRC-16 (Modbus, CCITT), CRC-32, CRC-64 and more algorithms. Supports text, hexadecimal, Base64 and file calculation.

Input Format

Input Data

Enter UTF-8 text, will be automatically converted to bytes

CRC Algorithm

Output Format

Documentation

This tool calculates multiple CRC variants, including common CRC-8/16/32/64 algorithms, with flexible input/output formats.

Key Features

Multiple algorithms (CRC-8, CRC-16, CRC-32, CRC-64)
Text/Hex/Base64/File input modes
Hex/Decimal/Binary output modes
Optional all-algorithms result view

Steps

Select input format and provide data.
Choose CRC algorithm and output format.
Calculate and review result.
Expand all algorithms and copy results if needed.

Use Cases

Protocol frame checksum validation
File transfer integrity checks
Embedded/industrial integration testing

Notes

Different CRC parameters produce different outputs.
Use exactly the same CRC specification as your protocol peer.
CRC is for error detection, not encryption or signatures.