Every retail barcode ends in a check digit designed to catch scanning or typing errors — a single mistyped digit almost always fails the checksum. This tool validates that check digit, or computes the correct one for a partial code.
What Is the EAN/UPC Barcode Validator?
A tool that verifies the check digit of EAN-8, EAN-13, and UPC-A retail barcode numbers using the standard alternating-weight modulo-10 algorithm, and can also compute the missing check digit for a code entered one digit short.
How to Use It
- Open the tool at /tools/ean-upc-barcode-validator.
- Type or paste a barcode number (8, 12, or 13 digits).
- See instantly whether the check digit is valid, or what the correct check digit should be for a shorter code.
Key Features
- Three format support: EAN-8, UPC-A, and EAN-13, all sharing the same checksum algorithm at different lengths.
- Both validation and generation, confirming a full code’s check digit or computing one for a partial code.
- Instant feedback as you type, no submit button needed.
- Fully client-side, no barcode data ever leaves your browser.
When to Use This Tool
- E-commerce and inventory systems, verifying product barcode data before importing it into a catalog.
- Manually entering barcode numbers, catching a typo before it causes a scanning mismatch downstream.
- Generating valid test barcodes, computing a correct check digit for sandbox/demo product data.
Try It Now
Open EAN/UPC Barcode Validator directly, or press ⌘K and type the tool name from anywhere on the site.
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