Barcode Generator
ConverterGenerate barcodes in 20+ formats: CODE128, EAN13, EAN8, UPC, CODE39, ITF14, MSI, pharmacode and more. Download as PNG or SVG and set the checksum in one click.
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About Barcode Generator
This barcode generator encodes text or numbers into scannable barcode images locally in your browser, ideal for price tags, asset numbers or event passes. Powered by JsBarcode, it supports over twenty standards including CODE128, EAN-13, EAN-8, UPC-A, CODE39, ITF-14, MSI, pharmacode and Codabar, and outputs PNG bitmaps or SVG vectors with customizable bar width, height, margins and colors. A few technical points worth knowing: CODE128 supports the full ASCII set with higher density, so it suits long or mixed alphanumeric data; EAN-13 and UPC-A follow retail standards and auto-append a GS1 modulo-10 checksum to the first 12 digits; CODE39 is limited to 43 characters yet is simpler and widely compatible. Because generation runs entirely in your browser, the data is never sent anywhere, making it safe for internal or sensitive codes. For mobile-friendly QR codes rather than one-dimensional barcodes, switch to our QR code generator — choose by what your scanner supports.
How to Use
- Open the Barcode Generator tool
- Select the source and target formats
- Adjust the output options as needed
- Click the Convert button; results appear in real time
- Copy or export the result
Use Cases
- Retail product barcodes — Generate EAN-13 or UPC-A barcodes for retail products for packaging printing and checkout scanning.
- Inventory management labels — Use CODE128 to generate alphanumeric inventory barcodes for warehouse scan-in and scan-out.
- Logistics tracking codes — Generate ITF-14 logistics case barcodes for supply chain shipping carton identification and tracking.
- Pharmaceutical codes — Generate pharmacode barcodes for pharmaceutical packaging identification and compliance labeling.
- Event check-in codes — Use CODE39 to generate participant number barcodes for quick scan-based check-in and verification.
FAQ
How is the EAN-13 checksum calculated?
It uses the GS1 modulo-10 weighted algorithm: multiply odd positions by 1 and even positions by 3, sum them, then subtract the units digit from 10. The tool auto-calculates and appends it.
What is the difference between CODE128 and CODE39?
CODE128 supports the full ASCII set with higher density, suited for long data; CODE39 supports only 43 characters (uppercase, digits, some symbols) but is simpler and widely compatible.
Can it export SVG vector format?
Yes. The tool outputs both PNG bitmaps and SVG vectors; SVG scales losslessly and is ideal for print layout.
Can generated barcodes be read by scanners?
Yes. Generated barcodes comply with each standard specification and are readable by mainstream laser scanners and phone cameras when bar width and height are set adequately.
My barcode is too dense to scan - what now?
Scan failure usually comes from bars that are too thin, low contrast, or too short. Increase bar width and height and ensure dark bars contrast sharply on a light background.
Is the data uploaded?
No. All barcode generation runs locally in your browser via JsBarcode with no network requests, so even sensitive code values stay on your device.