ADLER32 Hash Generator

Summary

Type or paste any text to instantly compute its Adler-32 checksum in decimal and hexadecimal.

How it works

1. Type or paste your text into the input area.
2. The tool initializes A = 1 and B = 0 (the Adler-32 starting values).
3. Each byte of the input updates A = (A + byte) mod 65521 and B = (B + A) mod 65521.
4. The final checksum is (B << 16) | A, displayed as a 32-bit value.
5. Results appear instantly in decimal, hexadecimal (upper and lower case), and binary.
6. Click any result field to copy that value to your clipboard.

Use cases

• Verify the integrity of a small text payload or configuration value.
• Learn how the Adler-32 algorithm works step by step.
• Generate expected checksums for unit tests involving data integrity.
• Cross-check Adler-32 output when debugging compression libraries (zlib uses it).
• Quick sanity-check that two strings are identical without storing either.
• Educational exploration of checksum algorithms for developers.

Frequently Asked Questions