Free Online Tool

CRC Calculator

Calculate CRC checksums for error detection.

How to Use Examples Related Tools

CRC Calculator

Calculate CRC checksums using various algorithms (CRC-8, CRC-16, CRC-32, etc.)

Select CRC Algorithms

Input Text

Characters: 0Words: 0

CRC Checksums

CRC checksums will appear here

Example Texts

Click any example to load it

Hello

Simple text - CRC32: 4A17B156

The quick brown fox jumps over the lazy dog

Pangram test

123456789

Numeric sequence - CRC32: CBF43926

How to Use CRC Calculator

Enter UTF-8 text to checksum.
Select one CRC variant or keep the default comparison set: CRC-8, CRC-16, and CRC-32.
Read each uppercase hexadecimal result with its algorithm label.
Copy one checksum or download the comparison for later verification.

A CRC treats the input bytes as polynomial coefficients and computes a fixed-width remainder. Different CRC variants use different polynomials and initialization rules.

Examples

Default three-algorithm comparison — input:

Hello

Output:

CRC8: F6 CRC16: F353 CRC32: F7D18982

Standard check string — input:

123456789

Output:

CRC8: F4 CRC16: BB3D CRC32: CBF43926

Features

Privacy Focused

All processing happens in your browser. No data is sent to servers.

Free Forever

No registration, no limits, completely free to use.