How to use it
- Pick the format you are working in — the digit count changes with it.
- Type the digits. Spaces and dashes are ignored.
- Enter one digit short of the full length to calculate the check digit, or the full length to verify it.
When you need this
- A supplier sent a GTIN and you want to know it is transcribable before it reaches a label.
- You are allocating SSCC-18 pallet numbers from a company prefix and need each check digit.
- A scanner rejects a printed barcode and you need to rule out a wrong check digit before blaming the printer.
Frequently asked questions
What is a check digit?
The last digit of a GS1 number, derived from the ones before it. A scanner recalculates it and rejects the read if it does not match, which catches most single-digit misreads and transpositions.
Which formats does this cover?
EAN-13, EAN-8, UPC-A, ITF-14 and GLN all use 13, 8, 12, 14 and 13 digits respectively, and SSCC-18 uses 18. All six use the same modulo-10 weighting.
Does my number get uploaded?
No. The calculation runs in your browser, so the digits never leave your computer.
Do this on real labels
Free
No signup
Runs in your browser
The calculators answer one number at a time. LabelInn applies the same maths across a whole design, a whole spreadsheet and a whole print run — and sends it to the printer without a driver.
Download LabelInn free See pricingFree plan available. Paid plans from $7.99/month.