How to Generate a Barcode Online Free
Type or paste the text you want to encode into the input field — this can be a product number, asset tag, serial number, ISBN, URL, or any alphanumeric string. The barcode updates instantly as you type. Code 128 supports the full ASCII character set, so letters, numbers, and most special characters are all valid. If you enter an unsupported character, the tool will display an error message.
Once the barcode looks correct, click 'Download SVG' to save the barcode as a scalable vector graphics file. SVG barcodes can be scaled to any size without quality loss, making them ideal for printing on labels, stickers, or documents at any resolution. You can also click 'Copy SVG' to copy the raw SVG markup to your clipboard for embedding directly in HTML, design tools, or laser engraving software.
For printing, open the downloaded SVG in any image editor (Inkscape, Adobe Illustrator, or even a browser) and print it at your desired size. For label printing, most label printer software accepts SVG files directly. The minimum recommended barcode height for reliable scanning is 15mm; the width depends on how much text you are encoding.
Why Use This Free Code 128 Barcode Generator?
- Generates Code 128B — the most widely used 1D barcode format, supported by all modern barcode scanners
- Pure browser-based SVG rendering with no server upload, no sign-up, and no watermarks
- SVG output is infinitely scalable — print at any size without pixelation or quality loss
- Instant generation as you type — see the barcode update in real time
- Human-readable text automatically displayed below the barcode for manual verification
- Works for any use case: inventory management, asset tracking, library labels, event tickets
- Completely free with no usage limits — generate as many barcodes as you need
Frequently Asked Questions
What is Code 128 and why is it the best general-purpose barcode?
Code 128 is a high-density 1D barcode symbology that can encode the complete ASCII character set — all 128 characters, including uppercase and lowercase letters, digits, and special characters. It is roughly twice as data-efficient as the older Code 39 format, meaning shorter barcodes for the same data. Code 128 includes a mandatory check digit for error detection and is the format used by FedEx, UPS, and USPS for shipping labels. It is the best choice for general internal use: inventory tags, asset labels, library items, and employee badges.
What is the difference between a barcode and a QR code?
Traditional barcodes (like Code 128, UPC, and EAN) are one-dimensional — they encode data in a single row of parallel bars of varying widths. They can hold limited data (typically 20–80 characters) and must be scanned horizontally with a laser or camera. QR codes are two-dimensional — they encode data in a grid of black and white squares, can hold thousands of characters, and can be scanned at any angle with any smartphone camera. For consumer-facing uses (linking to URLs, sharing contact info), use our QR code generator. For internal logistics and inventory, Code 128 barcodes are the industry standard.
Can I print barcodes generated by this tool on a label printer?
Yes. Download the SVG file and import it into your label design software (such as Dymo Label, Brother P-touch Editor, Zebra Designer, or Avery Design & Print). SVG is a vector format that scales perfectly to any label size. For the most reliable scanning, print barcodes at a minimum height of 15mm and ensure the bars are high-contrast — black bars on a white background. Test-scan the printed label before printing a large batch.
Do I need to pay for barcode numbers for internal use?
No. GS1 barcode numbers (UPC, EAN) are only required if you are selling products in retail stores that use point-of-sale barcode scanning and need globally unique product identifiers. For internal inventory management, asset tracking, library systems, or any use within your own organization, you can use any numbering system you create — no registration or payment required. Our barcode generator is perfect for these internal use cases.
What characters can Code 128 encode?
Code 128 can encode all 128 ASCII characters: uppercase letters A–Z, lowercase letters a–z, digits 0–9, and special characters including spaces, punctuation, and control characters. This makes it more versatile than UPC (digits only) and Code 39 (uppercase letters, digits, and a few special characters). If you need to encode lowercase letters, special characters, or long alphanumeric strings, Code 128 is the correct choice. Our barcode generator will alert you if you enter a character outside the supported set.
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