What Is a Barcode Generator?
A barcode generator is a tool that turns a number or text string into a scannable barcode image. You enter a value — a SKU, product ID, or inventory code — and the tool outputs a barcode you can download and print on labels, packaging, or shelf tags.
QR Master includes a free barcode generator that supports the most common formats used in retail and inventory management: EAN-13, UPC-A, and Code 128. No account required, no watermarks.
Supported Barcode Formats
- EAN-13 — The global standard for retail products. Used on nearly every consumer product sold outside North America. Requires a 13-digit number.
- UPC-A — The North American retail standard. 12 digits. Used by Amazon, Walmart, Target, and most US/Canada retail systems.
- Code 128 — The most flexible format. Supports letters and numbers. Ideal for internal inventory codes, warehouse labels, and shipping references.
How to Create a Barcode
- Open the QR Master barcode generator.
- Select the barcode type (EAN-13 for retail, Code 128 for inventory).
- Enter your code number or alphanumeric string.
- Download as PNG (for digital use) or SVG (for print, scales without blurring).
- Test the printed barcode with a scanner or smartphone app before mass printing.
Barcode vs. QR Code: When to Use Which
Barcodes and QR codes solve different problems. Use a barcode when the code identifies a physical item in an internal or retail system. Use a QR code when you want a customer or employee to scan and open a URL, form, or digital resource.
- Barcode: product SKU, warehouse shelf, retail checkout, inventory count
- QR code: restaurant menu, review page, product setup guide, marketing campaign
If the QR code destination might change after printing, use a dynamic QR code — the printed code stays the same, but you can update the link at any time.
Printing Tips for Reliable Scanning
- Use black bars on a white background — avoid colored barcodes unless tested
- Print at 300 DPI or higher for physical labels
- Leave a quiet zone (blank margin) around the barcode of at least 10 bar widths
- Minimum recommended width: 25mm for EAN-13, 20mm for Code 128
- Always scan a printed test copy before ordering bulk labels
Use Cases
The most common uses for an online barcode generator include:
- Product labels — give every SKU a scannable identity before retail listing
- Inventory management — label storage bins, shelves, and stock items
- eCommerce fulfillment — reduce packing errors by scanning products during order picking
- Event tickets — generate unique codes per ticket for check-in scanning
- Internal asset tracking — label equipment, tools, and office assets
Ready to create your first barcode? Use the free QR Master barcode generator — no signup, instant download.