Frequently asked questions
Is anything uploaded?
No. Barcodes are generated entirely in your browser with nothing uploaded. It works offline after the first load, which fetches a small library once.
Which barcode formats are supported?
Code 128 and Code 39 for general text, EAN-13, EAN-8 and UPC-A for retail products, plus ITF-14, MSI, Pharmacode and Codabar.
Why does my value show as invalid?
Retail formats require an exact number of digits, for example EAN-13 needs 12 to 13 digits and UPC needs 11 to 12. Code 128 accepts any text, so use it when you are not encoding a product code.
Can I download a print-ready file?
Yes. Download a PNG for documents and the web, or an SVG, which is vector and stays crisp at any print size.
Will it scan reliably?
Yes, as long as you keep the surrounding white margin and print it large enough. Avoid stretching or cropping the bars.