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Barcode Generator

LOCAL · Browser-Only

Generate barcodes in multiple formats - Code 128, Code 39, EAN-13, UPC-A, ITF, Codabar

Barcode Format

Any printable ASCII character (most versatile)

Barcode Value

Examples

Bar Width: 2x

Height: 100px

Text Below BarcodeShow encoded text

Background

Bar Color

Barcode Details

Format:Code 128

Encoded Value:Hello, World!

Dimensions:-

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What is Barcode Generator?

Free online barcode generator to create professional Code 128 barcodes from any text, product code, ISBN, or URL with this free online barcode generator.

Customize bar width, height, colors, and background. The tool uses the Code 128B character set to encode all printable ASCII characters (space through tilde). Make a scannable barcode for product labels, shipping packages, warehouse inventory, asset tags, or library books, then download it as a PNG image to drop into a label template or print sheet. Generate a single barcode from a SKU or serial number, or encode a URL so a scanner opens a link. All processing runs entirely in your browser - your data never leaves your device. No signup required.

How to Use Barcode Generator

1Enter the text, product code, ISBN, or URL you want to encode in the input field
2Adjust the barcode options: bar width, height, colors, and whether to show text below the barcode
3Preview the generated barcode in real time as you type or change settings
4Click 'Download PNG' to save the barcode as an image file
5View the encoded data section to see the Code 128B character values and checksum

Frequently Asked Questions

What is Code 128?

Code 128 is a high-density linear barcode symbology that can encode all 128 ASCII characters. It is widely used in shipping, packaging, and inventory management due to its compact size and reliability. This tool uses the Code 128B character set, which covers all standard printable ASCII characters (space through tilde).

What characters can I encode?

The Code 128B character set supports all printable ASCII characters from space (ASCII 32) through tilde (ASCII 126). This includes uppercase and lowercase letters, numbers, punctuation, and special characters like @, #, $, and more.

Can I customize the barcode appearance?

Yes. You can adjust the bar width multiplier (1x, 2x, or 3x), set the barcode height from 50 to 200 pixels, change the bar color, choose between a white or transparent background, and toggle the human-readable text below the barcode.

How do I download the barcode?

After entering your text and customizing the barcode, click the 'Download PNG' button. The barcode will be saved as a PNG image file that you can use in documents, labels, or print materials.

Is my data safe?

Absolutely. All barcode generation happens locally in your browser using the Canvas API. Your data is never sent to any server, making this tool completely safe for sensitive product codes, internal identifiers, or proprietary information.

How do I make a barcode for product labels?

Enter your SKU, product code, or serial number in the input field, set the height and bar width so the barcode fits your label size, and click Download PNG. Place the PNG into your label template (Avery, Word, or your label printer software) and print. Keep a clear quiet zone of empty space on both sides so scanners read it reliably.

Can I encode a URL in a Code 128 barcode?

Yes. Code 128B supports the full set of printable ASCII characters, so you can encode a full URL including slashes, dots, and query strings. A scanner that decodes the barcode will return the URL as text. For phone cameras that open links automatically, a QR code is usually a better fit.

Why will not my barcode scan?

The most common causes are a barcode printed too small, missing quiet zones, or low contrast. Increase the height and bar width, keep the bars black on a white background, and leave empty margins on the left and right. Avoid scaling the PNG unevenly after download, since stretching distorts the bar ratios.

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Keep reading: Markdown Cheat Sheet and http status codes reference. Doing this in code instead? See the utility endpoints.

What is Barcode Generator?

Free online barcode generator to create professional Code 128 barcodes from any text, product code, ISBN, or URL with this free online barcode generator.

How to Use Barcode Generator

1Enter the text, product code, ISBN, or URL you want to encode in the input field

2Adjust the barcode options: bar width, height, colors, and whether to show text below the barcode

3Preview the generated barcode in real time as you type or change settings

4Click 'Download PNG' to save the barcode as an image file

5View the encoded data section to see the Code 128B character values and checksum