CRC32 Checksum Generator
Calculate the CRC32 checksum of any text, as used by ZIP and PNG files.
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- Hash Generator — Generate longer MD5 and SHA checksums.
- Number Base Converter — Convert the hex result to decimal.
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How to use the CRC32 Checksum Generator
CRC32 is a fast 32-bit checksum used to detect accidental changes to data. It is built into ZIP archives, PNG images, Ethernet frames and many file formats. This calculator uses the standard IEEE 802.3 polynomial, the same one as ZIP and PHP's crc32() function, and shows the result as 8 hexadecimal characters.
- 1 Type or paste your text.
- 2 Copy the 8-character CRC32 checksum.
- 3 Paste an expected value into the compare box to check it.
Example and practical tips
The CRC32 of "The quick brown fox jumps over the lazy dog" is 414fa339.
Frequently asked questions
Is CRC32 a secure hash?
No. It is designed to catch accidental errors like transmission noise, not deliberate tampering, and collisions are easy to create. Use SHA-256 for security.
Why is my CRC32 different from another tool?
There are several CRC-32 variants. This tool uses the common CRC-32/ISO-HDLC (IEEE 802.3) version used by ZIP, PNG and most software, and hashes the text as UTF-8.
How do I get the decimal value?
Convert the hexadecimal result with the Number Base Converter; PHP's crc32() returns the same number as a decimal integer.