UPC-A Barcode Generator – Free Online Tool
Generate UPC-A barcodes instantly — no signup required, completely free. Enter your 11-digit product number, preview the barcode in real time, and download it as a PNG. Check digit is calculated automatically. All processing happens in your browser.
Format
Check digit: 5 → 012345678905
What is UPC-A?
UPC-A (Universal Product Code version A) is a 12-digit barcode standard that has been the backbone of North American retail since its commercial debut at a Marsh supermarket in Troy, Ohio on June 26, 1974. Managed today by GS1 US, UPC-A is printed on nearly every consumer product sold in the United States and Canada — from grocery items and pharmaceuticals to electronics and apparel.
The 12-digit number follows a precise structure. The first digit is the number system digit, which classifies the product type. The next five digits are the manufacturer code — a unique prefix assigned to the company by GS1 US. The following five digits are the product reference, assigned by the manufacturer to each individual SKU. The final digit is a check digit, derived mathematically from the preceding 11 digits using the Modulo 10 algorithm.
UPC-A encodes only numeric digits (0–9) and always represents exactly 12 digits. The standardized structure and compact size make it ideal for high-speed point-of-sale scanning in retail environments. All major POS systems, inventory platforms, and supply chain software natively support UPC-A scanning.
How to Get a UPC Code
To obtain legitimate UPC-A barcodes for retail products, you must obtain a GS1 Company Prefix from GS1 US — the official licensing body for UPC barcodes in the United States. Here is the standard process:
- Apply for a GS1 US membership. Visit the GS1 US website and complete the application. You will need basic company information and a payment method for the membership fee.
- Receive your GS1 Company Prefix. GS1 US assigns you a unique company prefix — a sequence of digits embedded in all your product barcodes. The prefix length determines how many product numbers you can assign.
- Assign product reference numbers. For each product variant (size, color, packaging), you assign a unique 5-digit reference number within your prefix. Combined with your company prefix, this gives you the first 11 digits of the UPC-A.
- Calculate the check digit. The 12th digit is computed automatically from the first 11. This generator performs that calculation for you instantly.
GS1 US membership fees start at approximately $250 for the initial setup plus an annual renewal fee that scales based on the number of GTINs required. Businesses needing fewer than 10 product identifiers can use the GS1 US single GTIN option at a lower cost.
UPC-A vs EAN-13
UPC-A and EAN-13 are the two most widely used retail barcode standards globally. Understanding their differences helps you select the right format for your products and markets:
| Feature | UPC-A | EAN-13 |
|---|---|---|
| Primary region | United States and Canada | Europe, Asia, Africa, Latin America, Oceania (100+ countries) |
| Digit count | 12 digits | 13 digits |
| Compatibility | UPC-A is equivalent to EAN-13 with a leading zero | Most modern scanners also read UPC-A |
| Managed by | GS1 US | GS1 (global) |
| Structure | 1 number system + 5 manufacturer + 5 product + 1 check | 2–3 country prefix + company prefix + product + 1 check |
| Amazon/eBay accepted | Yes (verified against GS1 US registry) | Yes (verified against GS1 global registry) |
UPC-A in Retail
UPC-A is the standard barcode format required by virtually every brick-and-mortar retailer and major e-commerce marketplace in the United States. Understanding where and how UPC-A barcodes are used helps ensure your products meet trading partner requirements.
Point-of-sale systems. US grocery, pharmacy, and general merchandise retailers scan UPC-A barcodes at checkout to retrieve price and product information from their inventory management systems. A malformed or invalid barcode will cause a scan failure, requiring manual price entry or rejection of the item.
Amazon and eBay. Both platforms require valid GTINs for most product listings. Amazon cross-references submitted UPC-A values against the GS1 US registry to verify authenticity. Barcodes purchased from unauthorized third-party resellers (not directly from GS1 US) are increasingly flagged and rejected by Amazon. eBay uses UPC-A values to match listings to its product catalog, improving search visibility.
Inventory and supply chain. Distributors, 3PLs (third-party logistics providers), and warehouse management systems use UPC-A scanning for receiving, putaway, picking, and shipping verification. Accurate, scannable UPC-A barcodes on shipping cartons and inner packs are often a contractual requirement for supplier compliance programs at major retailers.
Frequently Asked Questions
What is UPC-A?▾
UPC-A (Universal Product Code version A) is a 12-digit barcode standard used primarily in the United States and Canada to identify retail products at point of sale. Introduced in 1974 as the first barcode used in commercial grocery checkout, UPC-A is managed by GS1 US and remains the dominant retail barcode standard in North American supply chains. Every item sold in a US or Canadian supermarket, department store, or pharmacy typically carries a UPC-A barcode on its packaging.
How many digits does a UPC-A barcode have?▾
A UPC-A barcode contains exactly 12 digits. The structure is: 1 number system digit (indicating product category), 5 manufacturer digits (assigned by GS1 US), 5 product reference digits (assigned by the manufacturer), and 1 check digit calculated using the Modulo 10 algorithm. This generator accepts the first 11 digits and computes the check digit automatically, or you can enter all 12 digits to validate an existing barcode.
What is the difference between UPC-A and EAN-13?▾
UPC-A is a 12-digit format used in the United States and Canada, while EAN-13 is a 13-digit format used in over 100 countries worldwide. The two formats are closely related: a UPC-A barcode is mathematically equivalent to an EAN-13 barcode with a leading zero prepended. Modern barcode scanners in virtually every country can read both formats. If you sell products internationally, EAN-13 may be required by non-North American retailers, though GS1 US members can use their UPC prefix globally.
Do I need a GS1 number to use UPC-A?▾
Yes, if you plan to sell products through retail stores or on major online marketplaces. GS1 US is the official licensing body for UPC barcodes in the United States. A GS1 US membership provides a Company Prefix and costs approximately $250 for the initial fee plus an annual renewal fee that scales with the number of product identifiers. For internal use, testing, or non-retail applications, this free generator can produce structurally valid UPC-A barcodes without a GS1 membership.
How is the UPC-A check digit calculated?▾
The UPC-A check digit uses the Modulo 10 algorithm. Starting from the first digit, multiply alternating digits by 3 and 1 (odd positions by 3, even positions by 1). Sum all the products. Find the remainder when dividing by 10. Subtract from 10 — if the result is 10, the check digit is 0. For example, for digits 01234567890: (0×3 + 1×1 + 2×3 + 3×1 + 4×3 + 5×1 + 6×3 + 7×1 + 8×3 + 9×1 + 0×3) = 87. 87 mod 10 = 7. 10 − 7 = 3. Check digit is 3.
Can I use UPC-A barcodes for Amazon and eBay?▾
Yes. Amazon requires valid GTINs (Global Trade Item Numbers) for most product listings, and UPC-A barcodes issued by GS1 US satisfy this requirement. Amazon verifies GTINs against the GS1 database, so barcodes obtained from unauthorized resellers may be rejected. eBay also accepts UPC-A barcodes for product catalog matching. When listing on either platform, enter the full 12-digit UPC-A number including the check digit in the product identifier field.
What is the number system digit in UPC-A?▾
The number system digit is the first digit of a UPC-A barcode and indicates the product category. Common values: 0 = regular grocery and retail items, 1 = reserved, 2 = random-weight items (produce, deli), 3 = pharmaceuticals and health products, 4 = retailer-specific loyalty items, 5 = coupons, 6 = regular items (alternative to 0), 7 = regular items, 8 = reserved, 9 = coupons. Most consumer products use number system digit 0 or 6, both of which are allocated by GS1 US for standard retail products.