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🔢 CRC Calculator

CRC-8/16/32/64 Checksum Calculator with 24 algorithms, text/hex/file input

All computation runs locally in your browser. Input data is not uploaded by the tool.

Algorithm Width

Output Format

Case

CRC Results (click to copy)

⚙️ Custom CRC Parameters

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Online CRC checksum calculator supporting 24 algorithm variants across CRC-8, CRC-16, CRC-32, and CRC-64 (Modbus, CCITT, Ethernet, USB, XMODEM, etc.). Accepts text, hexadecimal, and file input with real-time computation. Supports custom polynomial parameters. All processing runs locally in your browser.