ISBN-13 Validator
Verify modern USA book barcodes for listings in seconds. Enter ISBN-13 like 978-0-13-110362-7, get VALID/INVALID with expected check instantly offline with no signup plus Bowker registration notes and typo-recovery tips for sellers librarians bookstores students and publishers across retail catalog workflows daily plus press-error catches with prefix-meaning clarity for sellers librarians shops students publishers and distributors across book trade workflows daily.
Validate ISBN-13 check digit instantly. Free ISBN-13 validator for books.
Calculator Inputs
About ISBN-13
Verify modern USA book barcodes for listings in seconds. Enter ISBN-13 like 978-0-13-110362-7, get VALID/INVALID with expected check instantly offline with no signup plus Bowker registration notes and typo-recovery tips for sellers librarians bookstores students and publishers across retail catalog workflows daily plus press-error catches with prefix-meaning clarity for sellers librarians shops students publishers and distributors across book trade workflows daily.
Alternating 1/3 weights on first 12, check 13th. Dashes ignored. 978/979 prefix = bookland.
Fail: Shows expected digit. Fix typo, re-scan barcode.
USA: Required for Bowker registration, Amazon listing.
Privacy: Local only.
Limits: Checksum only, not title DB.
Seller listings: Austin sellers listing $200,000 Amazon inventory validate barcodes before creating ASINs. Seattle publishers QAing $2M back-cover runs catch press errors early on 09/22/2026.
Library catalogs: Chicago librarians cataloging $900,000 yearly acquisitions validate batches before MARC imports. Denver students citing $4,000 textbook stacks confirm editions match syllabi.
Shipment scans: Miami shops scanning $150,000 inbound shipments verify counts against invoices. New York distributors moving $9M pallets quarantine mismatches at docks.
Check math: Alternating 1-3 weights across twelve digits predict the thirteenth — single typos always fail loudly.
Prefix meaning: 978 and 979 mark bookland — country of manufacture hides elsewhere, never in prefixes.
Seller listings: Austin sellers listing $200,000 Amazon inventory validate barcodes before ASIN creation. Boston schools ordering $300,000 adoptions confirm edition digits match on 09/22/2026.
Library intake: Chicago librarians cataloging $900,000 yearly acquisitions validate batches pre-MARC import. Phoenix libraries weeding $100,000 collections scan before discarding.
Press QA: Seattle publishers QAing $2M back-cover runs catch transposed digits early. Denver students citing $4,000 textbook stacks match syllabi editions.
Dock checks: Miami shops scanning $150,000 inbound shipments verify counts against invoices. New York distributors moving $9M pallets quarantine mismatches dockside.
Prefix truth: 978 and 979 mark bookland only — manufacturing country hides elsewhere entirely.
Where it is used
Amazon sellers validating inventory, librarians cataloging new arrivals, bookstores scanning shipments, students citing textbooks, and publishers QAing back covers Austin sellers list $200,000 bookstore inventory, Chicago librarians catalog $900,000 acquisitions, Miami shops scan $150,000 shipments, Denver students cite $4,000 textbook stacks, Seattle publishers QA $2M back covers, and New York distributors move $9M pallets Austin sellers list $200,000 bookstore inventory, Chicago librarians catalog $900,000 acquisitions, Miami shops scan $150,000 shipments, Denver students cite $4,000 textbook stacks, Seattle publishers QA $2M back covers, New York distributors move $9M pallets, Boston schools order $300,000 adoptions, and Phoenix libraries weed $100,000 collections.
How to use the ISBN-13
- ISBN-13 — enter the value (e.g. 978-3-16-148410-0).
- Calculate — press the Calculate button to see the result instantly above.
Formula
strip dashes → 13 digits → sum 1×/3× alternating first 12 → check (10-sum%10)%10.
Examples
Valid book
Typo catch
No dashes
Frequently Asked Questions
- ISBN-10 vs ISBN-13?
- Different algorithms; 13 starts 978/979, 10 uses mod11 + X.
- Expected digit?
- Shown on fail. Replace last digit and retry.
- 979 prefix?
- Newer music/books. Same math as 978.
- Dashes?
- Ignored. Paste any format.
- Valid but unknown?
- Checksum passes ≠ registered. Check Bowker/WorldCat.
- Private?
- Yes. Browser-local.