UPC (Universal Product Code) is the 12-digit barcode used on most retail products sold in the United States and Canada. The full form is UPC-A; a compressed 8-digit variant called UPC-E exists for small packages.

How is the UPC check digit calculated?

Take the first 11 digits, multiply digits in odd positions (1st, 3rd, …) by 3 and even positions by 1, sum them, then the check digit is the value that makes the total a multiple of 10. ReadBarcode does this calculation for you and tells you the expected digit if it doesn't match.

Why does my UPC fail validation?

Common reasons: extra spaces or letters, missing or extra digits, or a typo that breaks the check digit. The error message will tell you which one. UPC-A must be exactly 12 numeric digits.

Does this tool return product names and brands?

Not yet — this is a free validator and structure decoder. A real product database lookup is on the roadmap. For now, use the validated UPC with your own product source or the link-outs below.

Can I look up an EAN-13 here?

Use the EAN Lookup tool for EAN-8 and EAN-13. A UPC-A is technically an EAN-13 with a leading zero, so the GTIN Validator also accepts both.

Online Tool

UPC Lookup & Validator

Validate UPC-A and UPC-E codes, verify the check digit and decode the number system. Lookup results depend on available product data.

Result

Enter a UPC and press Validate. We'll verify the check digit and show the structure breakdown.

About lookup data

A UPC is just an identifier — there is no single official database that maps every UPC to a product name. Public databases vary in coverage, especially for private-label, regional or older items. ReadBarcode's validator works 100% offline in your browser and does not depend on any paid API. The product lookup integration is on the roadmap.

UPC-A number system digit

The first digit of a UPC-A hints at what kind of code it is. This is a coarse classification — manufacturers and use cases overlap.

Digit	Meaning
0, 6, 7, 8	Regular UPC codes (most retail products)
1	Reserved
2	Random-weight items (produce, meat, deli) — price encoded in the barcode
3	National Drug Code (NDC) — pharmacy and OTC drugs
4	Loyalty cards and in-store use
5, 9	Coupons

About this UPC lookup tool

This UPC lookup tool validates and decodes UPC-A and UPC-E barcodes — the 12-digit and 8-digit codes found on most retail products in the United States and Canada. It checks the check digit using the official mod-10 algorithm, splits the code into its number system, manufacturer and product segments, and shows the equivalent EAN-13 so you can use it anywhere in the world.

The validator works fully in your browser. A real product database lookup is on the roadmap; for now, validated codes can be sent to external catalog searches with one click.

When to use it

Verifying a UPC before listing a product on Amazon, eBay or Shopify.
Catching a mistyped digit in a printed UPC before sending it to a printer.
Confirming whether a code is UPC-A or compressed UPC-E.
Converting a UPC-A to its EAN-13 equivalent for international use.
Decoding a UPC's number system to spot coupons, NDC or random-weight codes.

How it works

1Step 1
Paste the UPC
Type or paste the digits. Spaces and dashes are ignored automatically.
2Step 2
Validate
We compute the check digit and confirm the format is UPC-A or UPC-E.
3Step 3
See the structure
Number system, manufacturer prefix, product code and check digit are split out.
4Step 4
Get the EAN-13
We show the EAN-13 equivalent (UPC-A with a leading zero) for international catalogs.
5Step 5
Look it up externally
Open the validated code in Google or a public catalog if you need product info.

What to avoid

Trusting any code that fails the check-digit test — it's almost certainly wrong.
Expecting every UPC to return a product name; many private-label items aren't in any public database.
Mixing up UPC-A (12 digits) with EAN-13 (13 digits) — the leading zero matters.
Validating a UPC with extra characters — clean spaces, dashes and letters first.
Paying for a third-party lookup before validating the UPC is even structurally correct.

Tips & tricks

Random-weight codes starting with 2 don't have a stable product mapping — they encode price.
If your UPC is on a coupon, it starts with 5 or 9 — that's not a product.
Use the EAN-13 form when querying international catalogs.
Save validated codes to a spreadsheet before sending them to a printer.
For book or magazine codes, use the ISBN reader instead of UPC lookup.