🍋 QR & Barcode
Barcode Validator
chars
words
sentences
lines
Results
Result
About Barcode Validator
Validate barcode data strings — check digit verification, format detection, and structure analysis for UPC, EAN, ISBN, and more.
How It Works
Enter a barcode number to detect its format, verify the check digit using the standard modulo algorithm, and see a breakdown of the code structure (country prefix, manufacturer, product, check).
Frequently Asked Questions
What barcode formats can this validate?
UPC-A (12 digits), UPC-E (8 digits), EAN-13 (13 digits), EAN-8 (8 digits), ISBN-10, ISBN-13, ISSN, and Code 128 character set validation.
What is a check digit?
The last digit of barcodes like UPC and EAN, calculated from the other digits using a weighted sum algorithm. It catches single-digit errors and adjacent transpositions.