Is CRC32 a secure hash?

No. CRC32 detects accidental changes but is easy to fake on purpose, so it is not for security or passwords.

What is CRC32 used for?

It is used in ZIP files, PNG images, Ethernet and many protocols to check that data was not corrupted.

No. The checksum is computed entirely in your browser.

Security & Cryptography

CRC32 Checksum Calculator

Compute the CRC32 checksum of text.

Free foreverRuns in your browserNo sign-up

Text

CRC32 is a fast checksum for detecting accidental changes, not a secure hash. Everything runs in your browser.

100% private - runs entirely in your browser.

Your input, keys and passwords are never uploaded. Want proof? Load this page, then turn off your internet - the tool still works. For an exact check, open your browser's DevTools Network tab and confirm no data is sent when you use it.

About the CRC32 Checksum Calculator

Compute the CRC32 checksum of text, a fast way to detect accidental changes or corruption.

CRC32 is used in file formats, network protocols and archives to catch errors, not for security.

The checksum updates as you type and runs entirely in your browser.

Key features

CRC32 as hex
Updates as you type
Fast error-detection checksum
Copy the result instantly

How to use

1Type or paste your text.
2Read the CRC32 checksum.
3Copy it in one click.

Examples

Checksum text

Input: hello

Output: 3610a686

CRC32 gives an 8-character hex checksum.

Detect changes

Input: hello!

Output: A different checksum

Any change to the text changes the CRC32.

Frequently asked questions

Is CRC32 a secure hash?: No. CRC32 detects accidental changes but is easy to fake on purpose, so it is not for security or passwords.
What is CRC32 used for?: It is used in ZIP files, PNG images, Ethernet and many protocols to check that data was not corrupted.
Is my data uploaded?: No. The checksum is computed entirely in your browser.