UPC to GTIN-14 Converter
Convert a UPC-A, EAN-13, or EAN-8 to its GTIN-14 form, and see what the leading indicator digit actually means.
Include the check digit. The full number, exactly as it appears under the barcode.
How UPC to GTIN-14 conversion works
A UPC, an EAN, and a GTIN-14 are not different numbers. They are the same identifier written at different widths. GTIN-14 is the widest form, so any shorter format converts to it by adding leading zeros, and nothing else about the number changes.
| Format | Digits | Zeros added |
|---|---|---|
| GTIN-8 (EAN-8) | 8 | 6 |
| GTIN-12 (UPC-A) | 12 | 2 |
| GTIN-13 (EAN-13) | 13 | 1 |
| GTIN-14 | 14 | 0 |
The indicator digit is not padding
This is where conversions go wrong. Position one of a GTIN-14 is the indicator digit, and it carries meaning: it says which packaging level the number refers to. When you pad a UPC you get an indicator of 0, which correctly says “this is the base unit”. But a case of that same product has its own GTIN-14 with a different indicator, and it is a genuinely different number, not a formatting variant.
GS1 reserves 1 through 8 for fixed-measure groupings and 9 for variable-measure items. It does not fix which of 1 to 8 means a carton and which means a pallet: the brand owner decides and must then stay consistent.
Why the check digit does not change
The GS1 check digit is a weighted sum, and a zero contributes nothing to it whatever weight it carries. So the digit that was valid on the 12-digit form is still valid on the 14-digit form. If a conversion tool ever hands you a different check digit, it has changed your number.
Got your GTIN-14? Put it on your packaging.
A GTIN-14 is the input to a GS1 Digital Link QR code. Generate one free, or host a live resolver so the code actually resolves when a shopper scans it.
Related tools and guides
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