Barcode Generator
The Barcode Generator creates 1D and 2D barcodes from text or numeric input. Barcodes are machine-readable representations of data, widely used in retail, shipping, inventory management, and product identification. This generator supports common barcode formats including Code 128, EAN-13, UPC-A, and Code 39. Each format has specific use cases: UPC/EAN for retail products, Code 128 for shipping and logistics, and Code 39 for industrial applications.
Formula
Barcode formats: - Code 128: alphanumeric, variable length - EAN-13: 13 digits, retail products - UPC-A: 12 digits, North American retail - Code 39: uppercase + special chars Each format has specific encoding rules and checksums
Example
Code 128: ABC123456 EAN-13: 5901234123457 UPC-A: 036000291452 Code 39: *HELLO WORLD*
How to Use
- Select the barcode format (Code 128, EAN-13, UPC-A, or Code 39)
- Enter your data into the input field
- Click generate to create the barcode
- Download the barcode image (PNG or SVG)
- Test with a barcode scanner before printing or deploying
Frequently Asked Questions
What barcode format should I use?
For retail products, use EAN-13 (international) or UPC-A (North America). For shipping and logistics, use Code 128. For industrial applications, use Code 39. For books, use ISBN (which is EAN-13 with a 978 prefix). QR codes are better for marketing and mobile scanning.
What is the difference between 1D and 2D barcodes?
1D barcodes (linear) store data in horizontal lines and have limited capacity (typically 20-25 characters). 2D barcodes (like QR codes) store data in both dimensions and can hold thousands of characters. 1D codes are simpler and cheaper; 2D codes are more versatile.
How do I calculate the EAN-13 checksum?
The 13th digit of an EAN-13 barcode is a checksum. Multiply alternating digits by 1 and 3, sum the results, and find the number that makes the total a multiple of 10. This validator automatically calculates and verifies the checksum.
Can barcodes be colored?
Barcodes should maintain high contrast (black bars on white background) for reliable scanning. While some colors work, low contrast can cause scanning failures. Test any colored barcode with multiple scanners before deployment. Avoid red-on-white (scanners use red light).
What is a barcode symbology?
A symbology is the encoding scheme used by a barcode. Common symbologies include Code 128, EAN-13, UPC-A, Code 39, and PDF417. Each symbology has rules for encoding characters, calculating checksums, and structuring the barcode. Choose the symbology that matches your industry standard.