Barcode Generator

This generator renders linear (1D) barcodes in 21 symbologies using the jsbarcode library, grouped in the picker as Standard (CODE 128 plus its A/B/C subsets, CODE 39, CODE 93), Retail/Product (EAN-13, EAN-8, EAN-5, EAN-2, UPC-A, UPC-E), and Industrial (ITF-14, ITF/Interleaved 2 of 5, MSI with mod-10/mod-11 variants, Pharmacode, and Codabar). The CODE 128 subsets are not interchangeable: CODE 128A accepts uppercase, digits and a limited symbol set, CODE 128B accepts all printable ASCII, and CODE 128C only encodes digit pairs (input must be numeric and even-length), which is why each is offered separately. These are all one-dimensional formats - there is no QR or DataMatrix support here, since those are 2D matrix codes.

Input is validated live against per-format rules before anything is drawn. For EAN-13, EAN-8, UPC-A and ITF-14 the tool computes the trailing check digit with a Mod-10 algorithm using 3-1-3 positional weighting (each digit at an odd position from the right is multiplied by 3), so you can type the 12-digit body of an EAN-13 and it auto-completes the 13th digit, but supplying a full code with a wrong check digit is rejected with an inline error. Other formats enforce their own constraints: Pharmacode only accepts integers from 3 to 131070, Codabar requires A-D start/stop letters wrapping the data, ITF and CODE 128C require even digit counts, and EAN-5/EAN-2 are the 5- and 2-digit supplemental add-ons. A green 'Valid input' confirmation or a red error message updates as you type.

Appearance is adjustable through a settings panel with six color presets (Classic, Blue, Green, Red, Purple, Dark) plus custom foreground/background color pickers, a bar-width slider from 1 to 5, a height slider from 50 to 200px, and a font-size slider from 10 to 24px, with an option to hide the human-readable text. Output can be downloaded as PNG, copied to the clipboard as a PNG image, or exported as SVG (note the SVG simply embeds the rasterized PNG inside an <image> element rather than emitting true vector bars). A batch mode lets you queue multiple data/format pairs and download them all as separate PNGs in sequence, and the full configuration - data, format, size, colors - is encoded in the URL so a specific barcode setup can be shared via link.