# GTIN / UPC Decoder

> Validate GTIN and UPC check digits and read the structure of a product code.

- Page: https://decoder.tools/gtin-decoder
- Category: Identification & Serials
- Status: live, runs in the browser
- Last reviewed: 2026-10-23

A GTIN decoder validates the check digit of a Global Trade Item Number — GTIN-8, GTIN-12 (UPC), GTIN-13 (EAN) or GTIN-14 — and breaks the number into its company prefix, item reference and check digit.

## Example

```text Input
0036000291452
```

```text Output
Format: GTIN-13
Check digit: 2 ✓ valid
```

## What is the GTIN / UPC Decoder?

GTIN is the umbrella term for the product numbers printed under retail barcodes. GTIN-13 (EAN-13) is the global standard, GTIN-12 is the 12-digit UPC-A used in North America, GTIN-8 is the compact form for small packaging, and GTIN-14 adds a packaging-level indicator digit for cases and pallets. Shorter forms are zero-padded to 14 digits when stored, so all four are directly comparable.

Every one ends in a check digit computed the same way: multiply digits alternately by 3 and 1 from the right, sum them, and the check digit is whatever brings the total to the next multiple of ten. That single digit catches the overwhelming majority of manual keying errors.

The leading digits are a GS1 company prefix, assigned to the brand owner — which is why the prefix indicates where a company registered, not where a product was manufactured. Reading it as a country of origin is a persistent and incorrect internet claim.

## How to use the GTIN / UPC Decoder

1. Enter the GTIN, UPC or EAN exactly as printed under the barcode.
2. Read the detected form and the component breakdown.
3. Confirm the check digit validates before entering the code into a catalogue.

## When to use it

- Validating product codes during a catalogue or PIM data import.
- Computing the correct check digit before generating a barcode.
- Diagnosing why a scanner rejects a printed label.

## GTIN / UPC Decoder at a glance

| | |
|---|---|
| Forms | GTIN-8, GTIN-12 (UPC), GTIN-13 (EAN), GTIN-14 |
| Check digit | Alternating ×3/×1 weights, rounded up to a multiple of 10 |
| Prefix | GS1 company prefix — registration, not manufacture |
| Storage | Zero-padded to 14 digits for comparison |

## FAQ

### How is a GTIN check digit calculated?

Working from the right, multiply digits alternately by 3 and 1, sum the results, then take whatever value brings that sum up to the next multiple of ten. That value is the check digit.

### Does the barcode tell me the country of origin?

No. The GS1 prefix identifies the numbering organisation where the brand owner registered. A product with a 50x prefix was registered by a UK company; it may have been made anywhere.

### What is the difference between UPC, EAN and GTIN?

GTIN is the umbrella standard. UPC-A is GTIN-12, EAN-13 is GTIN-13. A UPC is simply a GTIN-13 with a leading zero, which is why modern systems store everything padded to 14 digits.