Encodes barcodes with in-house encoders and renders them as SVG: Code 128 (automatic subset B/C switching for digit runs, mod-103 check), EAN-13, EAN-8 and UPC-A (check digit calculated or verified, guard bars, human-readable digits), Code 39 (optional mod-43 check character) and Interleaved 2 of 5 (optional mod-10 check, odd lengths zero-padded). Set module width, height, margin, colours and text; the preview renders every line on white. The SVG output downloads as a vector file. Everything runs locally.