Is the value I enter uploaded to a server?

No. Encoding and rendering are done entirely in your browser by the jsbarcode (npm) library. No network traffic is generated.

What's the difference between JAN and EAN?

JAN (Japanese Article Number) is the domestic name for what is internationally the EAN (International Article Number) standard — they are identical. There is a 13-digit standard type (JAN-13 / EAN-13) and an 8-digit short type for small items (JAN-8 / EAN-8). The leading 45 / 49 prefix is the country code assigned to Japan.

Do I have to compute the check digit myself?

No. Enter 12 digits for JAN-13 / EAN-13, 7 digits for JAN-8 / EAN-8, or 11 digits for UPC-A and the final check digit is computed and appended automatically. If you enter the full length already including a check digit, it is validated instead.

Which type should I choose?

For retail products use JAN-13 / EAN-13 (or UPC-A for North America); for internal labels and free-form strings use CODE128; for legacy industrial / FA settings use CODE39; for shipping cartons use ITF; for courier slips use Codabar (NW-7). Each type shows a usage hint below the selector.

PNG vs SVG — which should I use?

PNG is convenient for label printing and pasting as an image. SVG is vector, so it stays crisp at any size and is ideal when the label size varies or when you re-edit in Illustrator / Inkscape. For printing, keep a generous bar width (2px or more) and margin so the bars don't smear.

Can I use the generated barcode commercially?

Generating the image itself is free to use. However, to actually distribute a product under a JAN / EAN / UPC code you must obtain a company prefix from GS1 (GS1 Japan / DSRI in Japan). A made-up JAN can collide with other companies' products at retail POS, so keep arbitrary numbers to internal use only.

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Barcode generator — JAN / EAN / UPC / CODE128 / CODE39

Turn numbers or text into 1D barcodes (JAN-13 / EAN-13, JAN-8 / EAN-8, UPC-A, CODE128, CODE39, ITF, Codabar/NW-7, MSI) and export them as PNG or SVG. Fine-tune bar width, height, colors, margin, and whether the human-readable value is printed below. Check digits are validated automatically. Everything is generated inside your browser — the value you enter never leaves your device.

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How to use

Pick a barcode type at the top (JAN-13 / EAN-13, JAN-8 / EAN-8, UPC-A, CODE128, CODE39, ITF, Codabar/NW-7, MSI). The sample, placeholder and digit-count hint in the input field change to match your choice. As you type, the barcode refreshes automatically. Tune the output format (PNG / SVG), bar width, height, colors, background, margin, and whether the value is printed below. For check-digit formats (JAN / EAN / UPC), enter the value without the check digit (12 / 7 / 11 digits) and it is computed and appended for you. Export the result as PNG / SVG or copy it straight to the clipboard.

FAQ

Is the value I enter uploaded to a server?: No. Encoding and rendering are done entirely in your browser by the jsbarcode (npm) library. No network traffic is generated.
What's the difference between JAN and EAN?: JAN (Japanese Article Number) is the domestic name for what is internationally the EAN (International Article Number) standard — they are identical. There is a 13-digit standard type (JAN-13 / EAN-13) and an 8-digit short type for small items (JAN-8 / EAN-8). The leading 45 / 49 prefix is the country code assigned to Japan.
Do I have to compute the check digit myself?: No. Enter 12 digits for JAN-13 / EAN-13, 7 digits for JAN-8 / EAN-8, or 11 digits for UPC-A and the final check digit is computed and appended automatically. If you enter the full length already including a check digit, it is validated instead.
Which type should I choose?: For retail products use JAN-13 / EAN-13 (or UPC-A for North America); for internal labels and free-form strings use CODE128; for legacy industrial / FA settings use CODE39; for shipping cartons use ITF; for courier slips use Codabar (NW-7). Each type shows a usage hint below the selector.
PNG vs SVG — which should I use?: PNG is convenient for label printing and pasting as an image. SVG is vector, so it stays crisp at any size and is ideal when the label size varies or when you re-edit in Illustrator / Inkscape. For printing, keep a generous bar width (2px or more) and margin so the bars don't smear.
Can I use the generated barcode commercially?: Generating the image itself is free to use. However, to actually distribute a product under a JAN / EAN / UPC code you must obtain a company prefix from GS1 (GS1 Japan / DSRI in Japan). A made-up JAN can collide with other companies' products at retail POS, so keep arbitrary numbers to internal use only.

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