Adler-32 checksum

Client

Fast checksum used inside zlib—two mod-65521 sums.

Adler-32 vs other digests

Adler-32 (RFC 1950) is a fast rolling checksum common in zlib streams—not a cryptographic hash. For ZIP-style CRC-32 or Castagnoli CRC32C on the same paste, open CRC-32 / CRC32C or upload a file on File checksum.

Adler-32: 0x11E60398

Nearby workflows on Toolcore

  • CRC-32 / CRC32C — when PNG, ZIP, or iSCSI polynomials fit better than Adler-32.
  • HMAC — for keyed message authentication instead of checksums.

Common use cases

  • Adler-32 checksum for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • adler32 checksum online
  • adler 32 calculator browser
  • zlib adler32 hash text
  • adler32 hex digest tool

More tools

Related utilities you can open in another tab—mostly client-side.