Generate a UPC-A barcode

Generate a twelve-digit UPC-A retail barcode with its check digit.

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ToolUPC-A Generator
Input
Output
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Preview

How it works

UPC-A encodes eleven data digits with alternating parity patterns, adds start, middle, and end guards, and computes the twelfth digit using a weighted modulo-10 checksum. The symbol represents a numeric retail identifier, not arbitrary product metadata.

  • The fixed twelve-digit structure supports point-of-sale scanning.

Worked example

Product UPC-A
Generate a UPC-A barcode for a retail product
Input
											Digits: 01234567890
Height: 80
Show text: true
Output

When to use this

Retail packaging, GTIN-12 catalogs, and print proofs generate UPC-A symbols.

Edge cases

  • The check digit must be recomputed after any data-digit change.
  • Quiet zones are part of the scan layout, not optional decoration.
  • A valid checksum does not prove that GS1 assigned the number.

References