Adler-32 Calculator
Calculate Adler-32 checksums for text, files, or URLs locally in your browser. Adler-32 is a fast non-cryptographic checksum used by zlib and related formats. Read more
What is Adler-32?
Adler-32 is a fast non-cryptographic checksum invented by Mark Adler. It produces a 32-bit value, normally shown as 8 hexadecimal characters, and is used by zlib and related compressed-data formats to detect accidental corruption.
This calculator runs entirely in your browser and supports text, local files, and URLs. Adler-32 is not a cryptographic hash and should not be used for security-sensitive integrity checks.
How to calculate an Adler-32 checksum
- Choose Text, File, or URL as the input type.
- Enter text, select a local file, or provide a URL.
- For text input, choose the input encoding that matches those bytes.
- Choose Hex or Base64 output, then click Hash.
File and URL modes checksum the raw input bytes. Text mode respects the selected input encoding.
Result example
UTF-8 abc produces 024d0127. An empty input produces 00000001.
Adler-32 versus CRC-32
Both are 32-bit non-cryptographic checksums, but they use different algorithms and return different values for the same input. Use Adler-32 when matching zlib-style checksums; use the CRC-32 calculator when a format or protocol specifies CRC-32.
