| Barcode | Result | Check digit |
|---|
Results appear here, one row per line
Checks the last digit of each UPC-A, EAN-13, EAN-8 or GTIN-14 number against its GS1 check digit, one number per line. It catches every single mistyped digit and most swapped neighbors, but not two neighbors 5 apart: 4006381333931 with 38 typed as 83 still passes. A number that fails gets the right check digit and the corrected number next to it.
Each line gets one of four results:
4006381333932 should end in 1.Click a row to see its check digit worked out, copy the number, or draw it with the Barcode Generator.
A valid check digit only proves the digits fit together. Anyone can type 12 digits and add the right check digit, so a pass doesn't mean the number was ever issued to a product. Verified by GS1, GS1's own registry, looks up who a number belongs to.
The first digits don't give the country of origin either. GS1 says so outright: 400 to 440 means the company got its prefix from GS1 Germany, and it can make the product anywhere.
The weights are 3 and 1 in turn, counted from the right, leaving out the check digit. Here is 4006381333931 worked through:
| Digit | 4 | 0 | 0 | 6 | 3 | 8 | 1 | 3 | 3 | 3 | 9 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| × | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 |
| = | 4 | 0 | 0 | 18 | 3 | 24 | 1 | 9 | 3 | 9 | 9 | 9 |
Counting from the right is why one rule fits all four lengths, and why a 0 in front changes nothing: the UPC-A 036000291452 and 0036000291452 both end in 2.
The type comes from the number of digits:
For numbers that have no check digit yet, the Barcode Calculator adds one to each line. To print them as barcodes, use the Barcode Generator, or paste the valid codes into the EAN Check barcode generator for a sheet of labels. To find which standard an unknown number follows, or to read GS1-128 application identifiers, see EAN Check.
Check the GS1 check digit of a UPC or EAN number, then who it belongs to.
Leave out the check digit, then multiply the digits by 3 and 1 in turn, starting with 3 on the rightmost one. Add it all up, and the check digit is what it takes to reach the next multiple of ten. GS1's own example, 629104150021, adds up to 57, so its check digit is 3. Because the counting starts from the right, the same rule works for 8, 12, 13 and 14 digits.
Almost always a typo. The check digit catches any single wrong digit, so a number that fails has at least one digit wrong, or someone made it up without working out the check digit. It misses some slips, though: two neighbors 5 apart swapped, like 27 for 72, still pass, and so can two mistakes at once. The Corrected column shows the number with the right last digit, but if the mistake was earlier in the number, that's a different product, so go back to the source.
Search it on Verified by GS1, GS1's own registry: it looks up who a number belongs to. This page can't tell you that. It checks the arithmetic, and a made-up number with the right check digit passes.
No, and GS1 says so itself: its prefixes don't identify the country of origin. A number starting with 400 to 440 got its company prefix from GS1 Germany, and that company can make the product anywhere. And 978 isn't a place at all: it means a book, its ISBN written as an EAN-13.