Barcode Generator
Generate 1D and 2D barcodes online in Code 128, EAN-13, UPC-A, Code 39, ITF-14, and Codabar formats with instant SVG and PNG vector download.
Code 128 accepts standard ASCII alphanumeric characters.
What is Barcode Generator?
TechnoLila's Barcode Generator is an ultra-fast, 100% client-side barcode creation tool designed for logistics managers, retail brands, warehouse supervisors, and developers. It supports standard linear symbologies including Code 128 (Auto/A/B/C), GS1 EAN-13, UPC-A, Code 39, ITF-14, and Codabar with automatic check digit calculation, customizable bar dimensions, quiet zone margins, human-readable text toggles, and high-DPI export in vector SVG and raster PNG formats.
Unlike traditional online utilities that upload your sensitive payloads to a remote server, TechnoLila's Barcode Generator executes 100% locally in your web browser using modern JavaScript APIs, HTML5 Canvas, and SVG vector rendering. No barcodes, asset IDs, Wi-Fi credentials, tokens, or proprietary payloads ever leave your device.
Symbology & Standards Specifications
| Symbology | ISO Standard | Character Capacity | Checksum Algorithm | Primary Application |
|---|---|---|---|---|
| Code 128 | ISO/IEC 15417 | Full 128 ASCII Set | Modulo 103 | Logistics, Shipping, Asset Tags |
| EAN-13 | ISO/IEC 15420 | 13 Numeric Digits | Modulo 10 (Weight 1 & 3) | Global Retail POS & Packaging |
| UPC-A | ISO/IEC 15420 | 12 Numeric Digits | Modulo 10 | North American Retail POS |
| Code 39 | ISO/IEC 16388 | A-Z, 0-9, 7 Symbols | Modulo 43 (Optional) | Industrial, Military, Automotive |
| QR Code 2D | ISO/IEC 18004 | Up to 7,089 Numerics / 2,953 Bytes | Reed-Solomon (7-30%) | Smartphones, Wi-Fi, vCard, Payments |
How to Use Barcode Generator Online
2. Enter your alphanumeric code, SKU, or serial number in the input field.
3. Customize bar width, height, margin, colors, and human-readable text styling.
4. Click "Download SVG" for scalable vector printing or "Download PNG" for high-resolution graphics, or use "Print Labels" to print directly.
Programmatic Code Examples
// Generate Code 128 Barcode in PHP using Picqer or pure SVG generator
$generator = new \Picqer\Barcode\BarcodeGeneratorSVG();
$svgBarcode = $generator->getBarcode('TECH-2026-X89', $generator::TYPE_CODE_128, 2, 100);
header('Content-Type: image/svg+xml');
echo $svgBarcode;// Client-side SVG barcode generation
const barcode = BarcodeEngine.generate('CODE128', 'TECH-2026-X89', {
width: 2, height: 100, displayValue: true
});
const svgMarkup = barcode.renderSvg();
document.getElementById('container').innerHTML = svgMarkup;Barcode Generator Example
TECH-2026-X89Code 128 Vector Barcode (Width: 2px, Height: 100px, Margin: 15px)Common Use Cases
Common Mistakes & Gotchas
2. Omitting required quiet zones (margins) causing laser barcode scanners to fail.
3. Using low-contrast color combinations (e.g. red bars on white background will not scan on red-laser scanners; always use dark bars on light backgrounds).
4. Incorrect EAN-13 manual check digit calculation (our generator calculates the 13th digit automatically).
Frequently Asked Questions
What is the difference between Code 128 and Code 39?
Code 128 is a high-density modern linear symbology that supports all 128 ASCII characters with Modulo 103 checksum verification, taking up significantly less horizontal label space than Code 39. Code 39 is an older standard widely supported by legacy industrial and automotive hardware.
How do I generate a retail EAN-13 or UPC-A barcode?
Select EAN-13 (international retail) or UPC-A (North American retail). Enter 12 numeric digits (for EAN-13) or 11 digits (for UPC-A). TechnoLila automatically calculates and appends the mandatory Modulo 10 check digit.
Can I download vector SVG barcodes for packaging design in Adobe Illustrator or CorelDraw?
Yes. Click the "Download SVG" button to export an infinitely scalable, vector-precise SVG file that preserves crisp lines at any DPI or print size without raster pixelation.
What is the "Quiet Zone" on a barcode?
The quiet zone is the clear blank margin on both the left and right ends of a barcode. Optical scanners require a minimum quiet zone of at least 10 times the narrowest bar width (or 6mm) to distinguish start and stop patterns from surrounding text or artwork.
Can I generate multiple barcodes in bulk or batch mode?
Yes. Toggle "Batch Mode" in our generator, enter or paste multiple SKUs/lines, and preview an entire printable label sheet or download them in bulk.
Why shouldn't I use red bars on white backgrounds for barcodes?
Most barcode scanners illuminate barcodes using red LED or laser light (630–670nm). Under red light, red ink reflects light identically to a white background, making the bars invisible to the optical sensor. Always use dark black, dark blue, or dark brown on white backgrounds.
Do I need a commercial license to use barcodes generated on TechnoLila?
No. All barcodes generated on TechnoLila are 100% free for both personal and commercial use without attribution.
Are barcodes generated on my device securely and privately?
Yes. All barcode rendering happens 100% in your local web browser using JavaScript and HTML5 Canvas/SVG. No text, serial numbers, or internal asset IDs are ever uploaded to our servers.