Barcode Generator
Generate barcodes in multiple formats — Code 128, EAN-13, UPC-A — free and private. Download as SVG or PNG for print and digital use. No account needed — works instantly in your browser.
Barcode Generator
Instantly generate verifiable, high-resolution retail barcodes locally. Download locally with zero server-side tracking.
Encoder Settings
Locally Generated
Your data sequences are converted directly inside your browser visually. No backend server ever reads or stores your inventory SKU values.
Live Preview Render
What Is a Barcode Generator?
A barcode generator is a tool that converts a number or text string into a visual barcode image you can download and print. A barcode itself is a machine-readable representation of data encoded as parallel lines of varying widths and spacing — the lines represent binary data that scanners read with a laser or camera. When a scanner reads a barcode, it translates that pattern into a value a computer uses to look up product information.
This generator supports four major formats: Code 128 for internal tracking and alphanumeric data, EAN-13 for international retail products, UPC-A for North American retail, and QR Code for URLs and digital use. All generation happens in your browser — no data is uploaded anywhere.
How to Use the Barcode Generator
- 1 Select a barcode format.
Choose Code 128 for internal tracking or alphanumeric data, UPC-A for North American retail (12 digits), EAN-13 for international retail (13 digits), or QR Code for URLs and digital content.
- 2 Enter your data.
Type your barcode value. Code 128 accepts any text or numbers. UPC-A requires exactly 12 digits. EAN-13 requires exactly 13 digits. The tool validates your input automatically.
- 3 Preview the barcode.
The barcode renders instantly below the input. Check that the human-readable number appears correctly under the lines.
- 4 Download your barcode.
Download as SVG for print-quality, infinitely scalable output, or PNG for digital use. SVG is recommended for anything going on a physical label.
Who Is This For?
Small businesses creating internal product labels, inventory tags, or shelf labels for their own warehouse or storage system — no GS1 registration needed for internal use.
Developers testing barcode scanning in an app or mobile project who need valid test barcodes in a specific format without a third-party service.
Anyone who needs a barcode for a non-retail inventory or tracking purpose — from library books to equipment checkouts to event management.
Key Benefits
All barcode generation happens in your browser. Your data never leaves your device.
Generate and download unlimited barcodes with no subscription, no watermarks, and no sign-up.
Type your data and download instantly. No email, no registration, no API key.
SVG barcodes are infinitely scalable — they will never pixelate regardless of print size, from label to billboard.
Understanding Barcode Formats
Code 128
The logistics standard. Code 128 is high-density and supports both numbers and letters. Used for internal inventory tracking, shipping labels, and warehouse management.
UPC-A
The North American retail standard. Required for selling products in physical stores in the USA or Canada. A rigid 12-digit numeric format — no letters allowed.
EAN-13
The global retail standard used outside North America. Identical to UPC but requires a 13-digit numeric structure — the first digit identifies the country prefix.
Getting a GS1 Company Prefix
This tool generates the visual barcode graphic for free, but you cannot invent a random number and put it on a product to sell at Target or Walmart. To sell in major retail supply chains, you must purchase a unique Company Prefix from GS1 — the global standards organization. This ensures your barcode does not accidentally conflict with another product in the global database.
For internal, non-retail use, you can use any number sequence you like.
How Do Scanners Read Barcodes?
A barcode scanner emits a red laser. The black lines absorb the laser light, and the white spaces reflect it back into the scanner's sensor. This rapid sequence of absorption and reflection is translated into binary code — 1s and 0s — which the point-of-sale system matches to an internal database.
Camera-based scanners (like those in smartphones) work differently — they capture a 2D image and decode the pattern using image processing algorithms.
Common Use Cases
Internal inventory labeling
Create Code 128 barcodes with custom SKU strings like SHIRT-BLU-L for product labels, shelf tags, or bin labels in a warehouse or storage room.
App and scanner testing
Developers building barcode scanning features can generate valid test barcodes in any format to verify that their scanner recognizes all supported symbologies correctly.
Event check-in systems
Generate unique Code 128 barcodes for event tickets, library cards, or access badges that a handheld scanner can validate at the door.
Retail product prototyping
Print provisional EAN-13 or UPC-A barcodes on prototype packaging before your official GS1 number arrives, for internal mock-up and photography purposes.
Frequently Asked Questions
What is a barcode? ▼
A barcode is a machine-readable representation of data encoded as parallel lines of varying widths and spacing. The lines represent binary data that scanners read with a laser or camera. When a scanner reads a barcode, it translates the pattern of black lines and white spaces into a number that a computer uses to look up product or item information.
Is this barcode generator free? ▼
Yes, completely free. All barcode generation happens in your browser — no data is sent to any server. You can generate and download as many barcodes as you need with no account required and no watermarks on the output.
What is the difference between Code 128 and EAN-13? ▼
Code 128 can encode any ASCII character and is used for internal product tracking, shipping labels, and inventory systems. EAN-13 is the standard for retail products sold internationally — those 13 digits are a globally unique product identifier that requires purchasing a Company Prefix from GS1 to use in retail.
Can I print a barcode I generate here? ▼
Yes. Download as SVG for high-quality, infinitely scalable print output that will not pixelate at any size — ideal for product labels, shelf tags, and packaging. Download as PNG for digital use. SVG is the recommended format for anything going to print.
Do I need a GS1 number to use this tool? ▼
Not for internal or non-retail use. If you are creating barcodes for your own warehouse, inventory system, or internal tracking, you can use any number sequence you like. If you plan to sell products through major retail supply chains, you must purchase a GS1 Company Prefix to ensure your barcode is globally unique and does not conflict with another product.
Can I put letters in my barcode? ▼
Yes, but only with Code 128 format. Code 128 accepts the full ASCII character set, making it ideal for internal SKU naming conventions like SHOE-RED-XL. Retail formats (UPC-A and EAN-13) are strictly numeric and will not accept letters.
The tools and calculators provided on The Simple Toolbox are intended for educational and informational purposes only. They do not constitute financial, legal, tax, or professional advice. While we strive to keep calculations accurate, numbers are based on user inputs and standard assumptions that may not apply to your specific situation. Always consult with a certified professional (such as a CPA, financial advisor, or attorney) before making significant financial or business decisions.
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