Free Barcode Validator

Check if your EAN, UPC, ISBN, or GTIN barcode number is valid

Enter Barcode
Options
Validation Result

Enter a barcode number and click "Validate" to check it.

Format:
Checksum:
Normalized Data:
Barcode Information

Format details will appear here after validation.

Free Online Barcode Validator

Our barcode validator lets you instantly check whether a barcode number is valid. It verifies the format, calculates and compares the check digit, and identifies the country of origin for EAN and UPC barcodes. Whether you're a retailer verifying product labels, a warehouse manager checking shipment codes, or a developer testing barcode generation, this tool gives you immediate results.

What Is Barcode Validation?

Barcode validation confirms that a barcode number follows the correct format and contains a valid check digit. The check digit is the last digit of most barcode types (EAN-13, UPC-A, EAN-8, EAN-14) and is calculated using a weighted sum algorithm. If the check digit doesn't match, the barcode is invalid and will not scan correctly at point of sale.

How Check Digits Work

For EAN-13 and UPC barcodes, the check digit is calculated by:

  1. Starting from the right, alternate digits are multiplied by 1 and 3
  2. All results are summed together
  3. The check digit is the number needed to round the sum up to the nearest multiple of 10

For example, in the EAN-13 barcode 5901234123457, the check digit is 7. Our validator performs this calculation automatically and tells you whether the check digit is correct.

Supported Barcode Formats

  • EAN-13: 13-digit European Article Number, the global standard for retail products
  • EAN-8: 8-digit compact version for small product packaging
  • UPC-A: 12-digit Universal Product Code used in North America
  • EAN-14: 14-digit code for trade items and shipping containers
  • ISBN-10: 10-character International Standard Book Number (legacy format)
  • ISBN-13: 13-digit International Standard Book Number (current format)
  • ISSN: 8-digit International Standard Serial Number for periodicals
  • Code 39: Alphanumeric barcode used in automotive, defense, and healthcare
  • ITF: Interleaved 2 of 5, used in shipping and warehousing

How to Use the Barcode Validator

  1. Enter your barcode number in the input field
  2. The tool automatically detects the barcode format based on length and structure
  3. Optionally override the detected format using the dropdown
  4. Click "Validate" to check the barcode
  5. View the results: valid/invalid status, checksum verification, and country of origin

GS1 Country Prefixes

The first two or three digits of an EAN-13 barcode indicate the GS1 country prefix, which identifies the country where the barcode was assigned (not necessarily where the product was manufactured). For example, prefixes 000-019 are assigned to the USA, 300-379 to France, 400-440 to Germany, and 690-699 to China. Our validator automatically looks up the country prefix and displays the issuing country.