MMaxTools

Barcode Generator

Generate EAN-13 retail barcodes — check digit computed automatically.

The Barcode Generator produces EAN-13 retail barcodes from a 12-digit product code, computing the 13th check digit automatically and rendering the familiar vertical-bar symbol as a downloadable PNG.

EAN-13 is the international retail standard — UPC-A codes used in North America are simply EAN-13 with a leading zero. The check digit is calculated with the standard weighted formula, and the rendering follows the official bar/space encoding for L, G and R patterns, so scanners read it correctly.

Barcodes identify product codes for inventory systems — they do not encode price or stock data. For demonstration, testing and label prototypes, this generator is fully functional; real products need a registered GS1 prefix. Runs locally in your browser.

5 901234 123457

Check digit: 7 (computed)

EAN-13 is the standard retail barcode; UPC-A codes are EAN-13 with a leading 0. The 13th digit is a weighted checksum computed automatically.

How to use the Barcode Generator

  1. Enter the first 12 digits of your product code.
  2. The 13th check digit is computed and shown automatically.
  3. Review the formatted code groups.
  4. Download the barcode PNG.
  5. Print or place it on the label design.

Frequently asked questions

How is the EAN-13 check digit calculated?

Sum the digits in alternating weights (1, 3, 1, 3… starting from the left), then take (10 − sum mod 10) mod 10. The calculator does this instantly and appends it.

What is the difference between EAN-13 and UPC-A?

UPC-A is the 12-digit North American code; EAN-13 is its 13-digit international extension. A UPC-A becomes an EAN-13 by adding a leading 0, which is why this generator accepts either framing.

Can I use any 12 digits?

For test labels, yes. For real retail products you need a GS1 company prefix assigned to your business — random codes can collide with genuine products in databases and checkout systems.

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