Free Barcode Generator

A barcode is a machine-readable representation of data — a pattern of bars, squares or dots that a scanner can decode back into the original numbers or text in a fraction of a second. One-dimensional (1D) barcodes like UPC and Code 128 store data in the varying widths of vertical bars; two-dimensional (2D) codes like QR and Data Matrix pack far more data into a grid of modules, along with error correction that keeps them scannable even when partly damaged.

Barcodes are the connective tissue of modern commerce. Every product on a supermarket shelf carries a UPC or EAN that identifies it at the checkout; every parcel moving through a warehouse is tracked with Code 128 or GS1-128 shipping labels; every book carries an ISBN barcode. Because the symbologies are open, deterministic standards, the barcode you generate here is identical to one produced by expensive enterprise software — what matters is that the data inside it (for retail, your GS1-assigned company prefix and item reference) is yours.

Start from where the barcode will be scanned. If it goes on a product sold in stores, the choice is made for you: UPC-A in North America, EAN-13 almost everywhere else, with a GS1-issued number behind it. Selling books? That's an ISBN barcode derived from your ISBN. Shipping cases to a retailer or distributor? They'll ask for ITF-14 on the carton and often a GS1-128 logistics label carrying the batch number, weight or best-before date in GS1 Application Identifier format.

Outside the retail world you're free to choose. Code 128 is the workhorse: compact, full-ASCII, and readable by every scanner made in the last thirty years — ideal for internal SKUs, shelf labels, asset tags and membership cards. When space is tight or you need to encode more than a short string, go 2D: Data Matrix stays scannable at tiny sizes on circuit boards and vials, while QR codes are the universal choice when a phone camera is the scanner.

Three things decide whether a printed barcode scans: contrast, quiet zones and size. Bars must be much darker than the background — black on white is the gold standard; if you recolor a barcode here, keep the contrast high and never print light bars on a dark background. The quiet zone (the mandated blank margin around the symbol) must survive trimming, so don't crop tight to the bars. And don't over-shrink: a UPC-A printed below roughly 80% of nominal size (about 1.02 × 1.47 inches at 100%) starts failing at the checkout.

For inkjet and office laser printers, download the SVG and print at 300 DPI or higher. For thermal label printers (Zebra, Dymo, Rollo), print the PNG at the printer's native resolution so bars land on whole dots. Then test with a real scanner or a phone app before committing to a print run.