Every GS1 identification number ends in a check digit calculated with the mod-10 algorithm: digits are weighted alternately by 3 and 1 from the right, summed, and the check digit brings the total to the next multiple of ten. A single mistyped digit always changes the result, so validating catches typos before you print thousands of labels.
Verified before you print
BarcodeKit draws every barcode from one precise geometry model, then reads it back with ZXing, an open-source scanner engine running in your browser. PNG, SVG, true-size PDF and EPS downloads all come from that same verified geometry, so what we check is exactly what you print.
Private by design
Nothing you type or upload leaves your device. There is no account, no server-side processing and no tracking of your product numbers.
Need a QR code for a website or menu instead? Use our sister app, QR Code Forever, for free static QR codes that never expire.
Frequently asked questions
Where do I get a real UPC or EAN number?
From GS1 (gs1us.org in the US, or your country's GS1 office via gs1.org). GS1 US sells single GTINs as well as company prefixes for larger catalogues. Enter the number GS1 gives you here and BarcodeKit turns it into a print-ready barcode.
Why is my check digit wrong?
Usually a digit was mistyped or dropped. Some spreadsheets also remove leading zeros from UPCs; format the column as text to keep them.
Is BarcodeKit free?
Yes. Generate, verify and download barcodes as PNG, SVG, PDF or EPS with no account, no watermark and no sign-up.
Are my barcode numbers uploaded anywhere?
No. Barcodes are drawn and checked entirely in your browser. Your product numbers, SKUs and CSV files never leave your device.
Do you sell UPC or EAN numbers?
No, and we recommend you never buy them from resellers. Official UPC, EAN and GTIN numbers are licensed by GS1, the standards body. Amazon and most retailers check numbers against the GS1 database and can reject recycled ones.