ISBN Validator & Converter
Bulk-validate ISBN-10/ISBN-13 check digits, suggest the correct one, convert 10↔13
isbn-check-digitvISO 2108:2017ISO 2108 (ISBN) + GS1 General Specifications (EAN-13 check digit)
Workspace
Local or server · same path as API
text/isbn0 characters
Paste one ISBN or a whole column; results appear as you type.
Check-digit math only. A valid ISBN is internally consistent — it is not proof that an agency assigned it to a real book.
API
forge.text.isbnSame contract as the page. Use an authenticated key in production.
curl -X POST 'https://forge.nebutra.com/v1/tools/text/isbn/invoke' \
-H 'Authorization: Bearer sk-sailor-…' \
-H 'Content-Type: application/json' \
-d '{
"example": true
}'