onul.works

Barcode Generator

Generate barcodes online from product codes or label values and download them as PNG files.

⌘ Runs in browser ◴ No data stored ⌁ Free

Concept

Generate barcodes for product codes, stock labels, and test images

This tool is designed for quick preview and export workflows such as SKU labels, inventory tags, and printable test barcodes.

You can convert product IDs, label strings, or temporary test values into barcode images and reuse them in stock workflows or label templates.

Before final output, set the barcode standard first, then verify scanner compatibility, final size, and margins to avoid reprints.

Use cases

Typical uses are product labeling, inventory tags, and mock/test code images before publishing to a real template.

Standard selection

Choose CODE128, EAN-13, UPC-A, CODE39, or ITF-14 based on whether you need mixed alphanumeric values or numeric-only fixed-length formats.

Pre-release checks

Validate scanner reading, barcode physical size, and top/bottom/side margins before downloading the final PNG.

If the barcode is for real labels, run one test print first, then tune format, dimensions, and margins before scaling to production.

Barcode preview

How to use

  1. 1 Choose the barcode format, bar width, height, and value display option.
  2. 2 Enter the value to encode and review the preview.
  3. 3 Download the barcode as a PNG when you are ready to use it.

Common use cases

  • Product code barcode creation
  • CODE128 and EAN13 label preview
  • Online barcode PNG export
  • Barcode PNG download

Frequently asked questions

Which formats does this barcode generator support?

You can choose CODE128, CODE39, EAN-13, UPC-A, or ITF-14, then adjust bar width, height, and whether the value is shown. MSI and Pharmacode are not currently supported.

Can I create barcodes online and save them?

Yes. Review the generated barcode preview in your browser, then download it as a PNG file.

Why does my input show an error?

Formats such as EAN-13 and UPC require specific digit lengths and character rules. Enter a value that matches the selected barcode format.

Related workflow

Barcode GeneratorTurn product or label values into a barcode first so the later layout has a ready visual asset. → Box Shadow GeneratorTune the shadow depth needed when placing the barcode on a card or label. → Color PickerSet background and accent colors so the UI around the barcode feels consistent.