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UPC-A & EAN-13 Barcode Generator

Turn an assigned numeric identifier into a scannable barcode representation.

Free · no sign-upInputs stay in this browser
Decision inputs
Adjust the example values to match one product, order, shipment, or planning period.

Enter 12/13 digits for EAN-13 or 11/12 digits for UPC-A. A missing check digit is calculated.

Live result Deterministic
Decision summary
Calculated from the visible formula and assumptions on this page.

Your result will appear here

Edit the example and calculate. No account is required.

How to use this tool

A decision, not just an output

Validate or calculate a UPC-A/EAN-13 check digit and render a print-ready SVG barcode. Read the output alongside its interpretation, assumptions, limitations, and source. Marketplace rates and external requirements should always be confirmed at the linked official source.

Formula & example

Transparent method

The modulo-10 check digit is calculated with alternating weights and the number is encoded with UPC-A/EAN-13 guard and digit patterns.

Example: EAN body 400638133393 receives check digit 1 and renders as 4006381333931.

Assumptions

  • • The identifier has already been legitimately assigned to the product.

Limitations

  • • This tool does not issue, register, or transfer a GTIN.
  • • Verify print size and scanner performance before production use.

Frequently asked questions

Is the UPC-A & EAN-13 Barcode Generator free?

Yes. The primary result is available without creating an account or entering an email address.

How is the result calculated?

The modulo-10 check digit is calculated with alternating weights and the number is encoded with UPC-A/EAN-13 guard and digit patterns.

What should I verify before using it?

This tool does not issue, register, or transfer a GTIN. Verify print size and scanner performance before production use.

Are my inputs private?

Core inputs are processed in your browser. ShipMargin records anonymous tool interaction events, not the business values entered into this form.