Which Barcode Do You Actually Need? Code 128 vs EAN-13 vs UPC-A, Explained for Sellers and Warehouses
A plain-English guide to picking the right barcode — Code 128, EAN-13, UPC-A, and QR — for e-commerce listings, warehouse labels, and shipping, plus how to generate them free.
Barcode vs QR code: know the difference
- 1D barcode (the classic vertical bars): A machine scans it horizontally and reads a string of digits/letters. Low capacity, fast, cheap — perfect for products, bin locations, and documents.
- 2D code (QR code): Stores much more (URLs, text, contact info) and scans with a phone. Great for event check-ins, promo material, and anti-counterfeit tracing. If you want a code that jumps to a URL, try the QR Code generator.
For most "list a product / print a label" jobs, a 1D barcode is all you need.
How to pick a 1D barcode
| Barcode | Typical use | Notes |
|---|---|---|
| EAN-13 | Retail products (intl. / Europe) | 13 digits; prefix from GS1; the product's "ID card" — create one with the EAN-13 generator |
| UPC-A | North-American retail | 12 digits; a subset of EAN-13 — create one with the UPC-A generator |
| Code 128 | Warehousing, logistics, internal tracking | High density, full ASCII; most flexible — create one with the Code 128 generator |
| Code 39 | Industrial, automotive, military | Smaller charset, good error tolerance, lower density — see the Code 39 generator |
| ITF-14 | Cartons / shipping boxes | Commonly used at the carton level — see the ITF-14 generator |
Quick rule of thumb:
- Listing products on a marketplace → EAN-13 (intl.) or UPC-A (North America). Sellers on Amazon should also read our Amazon barcode guide.
- Warehouse bin locations, inbound/outbound slips, internal traceability → Code 128, the most free-form. For printing many at once, see batch Code 128 generation.
- Outer shipping cartons → ITF-14.
When to use a QR code instead
- Event / meeting check-ins
- Posters and business cards (scan to open a site)
- Product anti-counterfeit / traceability (a QR can carry a URL)
In those cases use QR Code; if you need to pack lots of structured data (e.g., manufacturing work orders), Data Matrix or PDF417 fit better. Generate them with the QR Code generator, Data Matrix generator, or PDF417 generator.
How to generate them for free
Most people's first instinct is to install software — you don't have to. The online barcode generator on this site covers 35+ formats, with a few things that make it genuinely useful:
- Supports EAN-13, UPC-A, Code 128, QR Code, Data Matrix, and more.
- Batch generation: import a list of values (CSV or plain text) and get a whole batch at once — a huge time-saver for marketplace listings and warehouse labels.
- Exports PNG / SVG — SVG for print, PNG for web.
- No signup, runs in the browser, so your data stays local (privacy-friendly).
Printing 500 bin labels used to take half a day doing them one by one; with batch mode it's a few minutes. For printable layouts, the barcode label print tool lays out labels before printing, and the barcode scanner lets you verify a printed code reads back correctly.
A few practical tips
- Keep a quiet zone: leave blank margins on both sides of the barcode or scanners will fail.
- Print resolution: aim for 300 DPI or higher for print; SVG is the safest for vector output.
- Check digits: EAN-13 / UPC-A have a check digit — let a good tool compute it; don't type it by hand.
- Stay compliant for retail: real sellable product codes need a GS1 prefix — don't just make one up.