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CRC-32 Checksum Calculator.
Compute CRC-32, CRC-32C, Adler-32, CRC-16/CCITT and FNV-1a checksums of text or hex bytes, in hex and decimal.
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How to use CRC-32 Checksum Calculator
Type text (encoded as UTF-8) or paste bytes in hex. All checksums update as you type.
How it works
Table-driven CRC-32 (polynomial 0xEDB88320, as in ZIP and PNG) and CRC-32C (0x82F63B78), Adler-32 as in zlib, CRC-16/CCITT-FALSE (0x1021, initial 0xFFFF) and 32-bit FNV-1a.
Example
“123456789” gives CRC-32 CBF43926 and CRC-32C E3069283, the standard check values.
Questions about CRC-32 Checksum Calculator
Is CRC-32 Checksum Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Up to 10 MB. Checksums detect accidents, not tampering; use SHA-256 for security. Everything is calculated in your browser; nothing you type is uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.