What is Adler-32? How to decode it

Adler-32 is an checksum hash type. It is not a one-way password hash — the original value can be recovered directly without cracking. This page shows how to recognise it and the exact commands to attack it.

All identification runs locally in WebAssembly. The commands below write the hash to a local file on your machine — nothing is sent to this site.

Identifying the hash

The hash identifier on the home page detects Adler-32 entirely in your browser — your hash is never uploaded. A typical example looks like this:

0a8e1f23

Decoding this value

Adler-32 is not a cryptographic password hash, so there is nothing to "crack". The original data can be recovered directly:

# This is a non-cryptographic checksum. There is no password to recover.