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CRC32 Checksum Calculator

Calculate a CRC32 checksum — the fast error-detection code used in ZIP and PNG files.

To calculate a CRC32 checksum, paste text above and the 32-bit value appears in hexadecimal, decimal and signed forms. CRC32 is designed for speed and detecting accidental transmission errors, which is why ZIP archives and PNG images embed it.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Is CRC32 a secure hash?

No, and it was never meant to be. It detects accidental corruption in transmission and storage, which it does well and very quickly. Constructing two files with the same CRC32 is trivial, so it must never be used where an attacker is involved.

Why do ZIP files use CRC32?

Because it catches the errors that actually occur in storage — flipped bits and truncation — at almost no computational cost. The format dates from 1989, when a cryptographic hash per file would have been prohibitively slow.

How to use the crc32 checksum calculator

  1. 1Enter or paste your text.
  2. 2The result appears immediately — copy or download it.

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