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Adler-32 File

Adler-32 (2)

Compute the Adler-32 checksum of any file. Streamed in chunks, so large files work without freezing the browser.

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Calculate the Adler-32 checksum of a file. Free, offline, runs entirely in your browser. Read more Show less

What is Adler-32?

Adler-32 is a 32-bit checksum designed by Mark Adler, used in zlib and gzip. It is faster than CRC-32 on short inputs but weaker against certain error patterns. It appears in the trailer of zlib streams and is easy to compute in software.

How to use

Drag, click, or paste a file. The tool streams the file in chunks and computes Adler-32.

FAQ

Is Adler-32 secure?

No. It is a checksum, not a cryptographic hash.

Adler-32 vs CRC-32

Adler-32 is simpler and faster on short inputs. CRC-32 catches a wider class of errors. zlib uses Adler-32 for its own streams and CRC-32 for gzip wrappers.

Command line equivalent 
# Python
python -c "import zlib,sys; print(hex(zlib.adler32(open(sys.argv[1],'rb').read())))" myfile.bin

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