Adler-32 checksum

Client

RFC 1950 Adler-32 for zlib-style streams. For IEEE CRC-32, use CRC-32.

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.

Decimal
300286872
Hex
11e60398

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

  • Cross-check Adler-32 values when debugging zlib wrappers.
  • Compare against CRC tools when choosing a lightweight checksum.
  • Quick checksum for short UTF-8 payloads in tests.

Common mistakes to avoid

  • Confusing with CRC-32

    Adler-32 and CRC-32 use different polynomials and output conventions.

  • Expecting file upload

    This page hashes pasted UTF-8 text; use file checksum for whole files.

FAQ

Empty input?

Adler-32 of zero bytes is 1 (decimal).

Is data uploaded?

No. Hashing runs locally.

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.