Barcode Generator — Code 128 / EAN-13 / UPC-A / Code 39 to SVG & PNG

Real-world use cases

• Inventory labels for a small warehouse

  You're tagging 400 storage bins with internal IDs like BIN-A12-0033. Pick Code 128, type the ID, set bar width 2 px and height 60 px, turn the text line on so a human can read it if the scan fails. Copy the SVG into a label template in your label software (Brother P-touch, Dymo, or a sheet in InDesign), drop one per cell, and print on a 300 DPI label printer. Before the full run, print one bin label and scan it with the handheld you'll use on the floor — Code 128 is dense, so an under-resolved print is the usual failure, not the encoding.

• Retail product barcode for a store listing

  Your product needs an EAN-13 to go on a shelf. You already have the 12-digit number from your GS1 prefix (say 4006381333393). Pick EAN-13, paste the 12 digits, and the tool appends the check digit (…931) and shows the full 13-digit code split into the standard 1-6-6 groups under the bars. Export PNG at 3x for the packaging mock, or copy the SVG for the print-ready artwork at 100% of the nominal size. Hand the proof to your packaging vendor and have them verify it on a calibrated verifier, not just a phone.

• UPC-A for a North American retail SKU

  A US retailer asks for a UPC-A barcode on your unit carton. Take your 11-digit GTIN data (e.g. 03600029145), pick UPC-A, and the tool computes the 12th check digit (…2) automatically. The human-readable line prints in the UPC convention with the leading and trailing digits set slightly apart. Keep the symbol at 80-100% of nominal width and leave the quiet zones intact — the most common rejection at retail is a clipped left/right margin, not a bad code.

• Event ticket / asset tag with a short code

  You're printing 200 numbered passes (PASS-0001 … PASS-0200) and want a scannable code that maps to your check-in list. Use Code 39 for its simplicity and ruggedness, or Code 128 for tighter prints. Type each code, keep height around 50 px so it fits on a wristband or lanyard card, and turn on the readable text as a fallback for staff. Generate, screenshot/export, and drop into your ticket layout. Scan-test one against your check-in app before the batch.

• Quick visual mock for a packaging design

  A designer needs a placeholder barcode in a packaging comp before the real GS1 number is assigned. Pick EAN-13, type any 12 digits, let the tool add a valid check digit so the mock looks correct, set the colors to match the artwork (black bars on the package's base color rarely scan — keep bars dark on a light quiet zone). Copy the SVG into Figma or Illustrator. Flag clearly in the file that this is a placeholder so the real GTIN replaces it before production.

Common pitfalls

• Printing the barcode too small or at low resolution so the narrowest bar collapses. Scanners read the relative width of bars; if the module is under about 0.33 mm in print, cheap scanners miss it. Export at 3x, target 300 DPI, and scan-test a real print before the run.

• Clipping the quiet zone. The blank margin on each side of the code is part of the symbol — designers often crop it to "tighten" the layout, and then the barcode won't scan. Keep at least 10 modules of clear space left and right; this tool builds that margin in, so don't trim it.

• Putting dark bars on a colored or dark background. Scanners need high contrast between bars and the quiet zone. Black bars on a light (ideally white) background is the safe default; reversed or low-contrast color combinations drop scan reliability sharply even when they look fine on screen.

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