🧾 Barcode Generator
Generate valid EAN-13 & UPC-A barcodes with auto check digit — download as PNG.
EAN-13 · check digit 7
EAN-13 and UPC-A barcodes, generated right in your browser — free, no uploads.
About Barcode Generator
The Barcode Generator is a free online tool that creates valid, scannable EAN-13 and UPC-A barcodes from any sequence of digits. Whether you need barcodes for retail product labeling, inventory management, book publishing, or e-commerce listings, this tool generates industry-standard barcodes with the correct check digit calculated automatically. The result is a crisp PNG image ready for printing — and everything runs right in your browser with no uploads required.
How to Use
Enter your barcode number into the input field — 12 digits for UPC-A or 13 digits for EAN-13. If you enter 11 or 12 digits, the tool automatically computes the missing check digit to complete a valid barcode. Choose your preferred size (small, medium, or large) from the dropdown. The barcode renders instantly on the canvas below. When you're ready, click "Download PNG" to save the barcode image to your device.
Key Features
- Automatic check digit calculation — enter 11–12 digits and the tool computes the final check digit for a valid EAN-13 or UPC-A barcode
- EAN-13 and UPC-A support — the two most common barcode formats used in retail, publishing, and e-commerce worldwide
- Adjustable barcode size — choose small, medium, or large module width to match your label or packaging needs
- Human-readable digits — the barcode includes the numeric value printed below the bars for manual verification
- High-quality PNG export — download a clean, high-resolution PNG image suitable for printing on labels, packaging, or product sheets
- 100% client-side — all generation happens in your browser; no data is sent to any server
Use Cases
Retail product labeling: Generate barcodes for new products before listing them on Amazon, eBay, or in your own store. EAN-13 is the standard for most retail products sold internationally, while UPC-A is widely used in North America.
Inventory management: Create unique barcodes for warehouse items, stock-keeping units (SKUs), or internal tracking systems. Print them on labels and scan them with any standard barcode reader.
E-commerce listings: If you're selling products online and need a valid barcode number for your listing, this tool helps you verify and generate the correct barcode format with a valid check digit.
Frequently Asked Questions
What is the difference between EAN-13 and UPC-A?
EAN-13 barcodes use 13 digits and are the international standard for retail products — they're used worldwide. UPC-A barcodes use 12 digits and are primarily used in North America. EAN-13 can encode UPC-A barcodes by adding a leading zero. Both use the same check digit algorithm and are scannable by the same barcode readers.
What is a check digit and why does it matter?
The check digit is the final digit of a barcode number, calculated using a mathematical algorithm based on the preceding digits. It ensures the barcode was entered correctly — if even one digit is wrong, the check digit won't match and the barcode will fail validation. This tool computes the check digit automatically so your barcode is always valid.
Can I use these barcodes for selling on Amazon or eBay?
This tool generates visually valid barcodes with correct check digits, which is useful for internal use, prototyping, and label design. For正式 retail listings on Amazon, eBay, or other major marketplaces, you typically need a GS1-registered barcode prefix. Check the marketplace requirements before using self-generated barcodes for commercial products.
What print quality do I need for scannable barcodes?
For reliable scanning, barcodes should be printed at a minimum resolution of 300 DPI. The PNG download from this tool is suitable for most label printers. Ensure adequate quiet zones (white space) around the barcode, and test a sample print with a barcode scanner before printing in bulk. The barcode size setting in the tool affects the module width — larger sizes produce bigger, easier-to-scan barcodes.