Phát triển Web
Barcode Generator
Tạo mã vạch tuyến tính (CODE128, EAN-13, UPC, CODE39 và các loại khác) từ văn bản hoặc số.
Câu hỏi thường gặp
Why does it say my data doesn't fit the selected format?
Each barcode format has its own constraints — for example EAN-13 requires exactly 12 or 13 digits and CODE39 only supports a limited character set — so the data must match the chosen format's rules.
Which format should I use for arbitrary text?
CODE128 supports the full ASCII character set, including letters, digits and symbols, making it the most flexible choice when your data isn't purely numeric.
Does generating a barcode upload my data?
No, the barcode image is rendered entirely in your browser with the jsbarcode library — nothing is sent to a server.