ISBN-13 check digit (lite)

Client

Book industry ISBN-13 checksum.

ISBN-13 mod 10

Expects twelve-digit body without hyphens—does not fetch publisher metadata. Processing runs in your browser—Toolcore does not need your paste for the core operation on this page.

Checksum and format rules only—no live registry or carrier lookup.

How to use

Paste or type in the main field, then read the output below. Use Load example when available, or open the page with ?q= / ?qb= so tickets and agents share the same input.

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Nearby workflows on Toolcore

  • ISBN validate & convert — ISBN-10 / ISBN-13 checksums and 978↔ISBN-10 conversion—book identifiers only, no title lookup; browser-only. Useful when another column uses a different identifier ruleset.
  • GTIN checksum (EAN / UPC) — Paste GTIN‑8, UPC‑A (GTIN‑12), EAN‑13, or logistic GTIN‑14 digits—ISO GS1 modulus‑10 parity without GS1 lookup—browser-only. Useful when another column uses a different identifier ruleset.
  • EAN check digit (lite) — Compute EAN-13 check digit for 12-digit body. Useful when another column uses a different identifier ruleset.
  • ISSN validator — Validate ISSN-13 / ISSN-8 check digit for serial publications. Useful when another column uses a different identifier ruleset.

Common use cases

  • ISBN-13 check digit (lite) 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.

More tools

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