バーコード生成

Choose the barcode format before typing

Barcode Generator supports several common 1D and 2D formats: Micro QR, Data Matrix, Aztec Code, PDF417, Code 128, Code 39, EAN-13, and UPC-A. The format matters because each one accepts different kinds of data. For example, EAN-13 and UPC-A are numeric retail codes, while Code 128 can handle a wider range of text.

The input field filters or validates text based on the selected type. If a value disappears or shows an error, it usually means that barcode format cannot encode the characters or length you entered.

Single barcode workflow

1. Select the barcode type that matches your label, product code, ticket, or internal ID.
2. Enter the content. The hint below the field shows what characters are accepted.
3. Adjust size, padding, foreground color, and background color in the options panel.
4. Check the preview. If the barcode is for scanning, keep enough padding and strong contrast.
5. Download the PNG or copy it to the clipboard.

Batch mode is for lists

Batch Mode lets you create multiple codes of the same type. Add rows manually or upload a plain text file with one item per line. When you click Generate & Download ZIP, the tool generates PNG files and puts them into one ZIP archive.

Use batch mode when the format and styling are the same for every item, such as a list of shelf labels or internal asset IDs. If different rows need different barcode types, generate them in separate batches.

Why does EAN-13 reject my value?

EAN-13 expects 12 or 13 digits. Letters, spaces, and shorter values are not valid for that barcode type.

Can I generate many barcodes at once?

Yes. Open Batch Mode, add rows or upload a text file with one item per line, then download the generated PNG files as a ZIP.

What should I use for printable labels?

Use a dark foreground, a light background, and enough padding around the bars. Very low contrast or tight cropping can make scanners unreliable.

Is the barcode generated in the browser?

Yes. The page generates the PNG with browser-side JavaScript, then downloads or copies the image from your current session.