isbn-check.de

Isbn-Check.de

ISBN-Check.de is a German-language online tool for validating ISBN numbers assigned to books and other media. It accepts an ISBN via a web form and, when the number is found to be incorrect, calculates possible corrected alternatives to help identify transcription errors. The site is aimed at publishers, booksellers, librarians, and anyone who needs to verify or recover a valid ISBN.

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Authority

—/100

Safety

90/100

3 of 4 safety checks passed (Sep 14, 2026).

AboutUs has not vetted this site. 1 of 4 automated safety check did not pass. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.

Current facts

Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.

not yet retrieved

Registrar and registration date not retrieved yet — we retry on every view.

Authority & Safety, with the evidence

How this is scored →

Authority: not enough signals yetClear

Why we're not scoring this yet

We withhold an authority number until independent evidence (global rank, link-graph presence) has accrued. The facts we do have about this site are shown below — we'd rather say “not enough signals yet” than invent a low score.

Safety evidence

No unexpired threat-feed result; name-similarity check available (recorded about 28 days ago); 3/3 transport and email checks available (oldest recorded about 28 days ago). This is evidence coverage, not a probability that a website is safe.

No caution flags in the available scoring observations; this is not a complete safety assessment

Site history

Dated record — historical facts always carry their date.

2026
Checked today — 3 of 4 safety checks passed (Sep 14, 2026).

✓ live verified Sep 14, 2026

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Correction review promise

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