A barcode generator converts data into a scannable barcode image. A product number, SKU, asset ID, or URL goes in, and a barcode comes out that can be printed or scanned. Wasp's free online Barcode Maker lets users create common 1D and 2D barcode types including Code 128, Code 39, UPC-A, EAN-13, Data Matrix, and QR Codes directly in their browser with no account or payment required.

The check digit is the final digit in UPC-A and EAN-13 barcodes, crucial for error detection during scanning. It's calculated using a specific algorithm (often a modulo 10 sum of the preceding digits, with alternating weights). When a barcode is scanned, the scanner performs the same calculation. If the calculated check digit matches the one printed on the barcode, it confirms a successful and accurate scan. If they don't match, an error is signaled, preventing incorrect data entry.

Yes. Our barcode generator is free. You can create unlimited barcodes, download files, and add them to your label designs at no cost.