Security & Password

CRC-32 & Adler-32 Checksum

Calculate CRC-32 and Adler-32 checksums of text.

Security & Password

Local only

Text (UTF-8)

Everything stays in your browser

Your text is processed on your device — nothing is uploaded to a server.

How it works

CRC-32 (IEEE, as used by ZIP/PNG) and Adler-32 (zlib).

Good to know

How do I use it?

Enter your text (utf-8) and press “Calculate”. Check the result, then copy or download it.

How does it work?

CRC-32 (IEEE, as used by ZIP/PNG) and Adler-32 (zlib).

Is my data uploaded?

No. Everything is processed in your browser and nothing is sent to a server. No account is needed.