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QR Code Generator

Generate custom QR codes for URLs, text, Wi-Fi credentials, and contact info with PNG download.

Resumen Rápido: Generate free custom QR codes for websites, Wi-Fi networks, vCards, text, and payments. Customize colors, add center logos, adjust error correction, and download vector SVG/PNG.

Website URL

QR Styling, Colors & Logo

Foreground Color

#000000

Background Color

Trans

Corner Dot Style

Error Correction

Center Icon / Logo

Upload Logo

What is QR Code Generator?

Create high-resolution QR codes instantly in your browser with customizable size, colors, linear gradients, error correction levels (L, M, Q, H), center logo embedding, and instant PNG/SVG vector download.

Unlike traditional online utilities that upload your sensitive payloads to a remote server, TechnoLila's QR Code 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 QR Code Generator Online

1. Select the QR code type (URL, Wi-Fi, vCard Contact, Text, Email, SMS, Phone, Crypto, or Event).
2. Fill in the required fields (e.g., website link, Wi-Fi password, or contact information).
3. Customize visual styling: pick colors, gradients, corner dot shape, and error correction level.
4. Optionally embed a center logo icon (e.g. Wi-Fi symbol, WhatsApp logo, or custom brand upload).
5. Click "Download PNG" or "Download SVG" for instant high-resolution print-ready files.

Programmatic Code Examples

Generate Programmatically Node.js / PHP / Python

JavaScript (Frontend QR Rendering):

// Generate Wi-Fi or URL QR Code
const qr = QrEngine.generate('WIFI:S:MyNetwork;T:WPA;P:MyPassword;;', {
  size: 300, level: 'Q', fgColor: '#000000', bgColor: '#ffffff'
});
qr.renderCanvas(document.getElementById('myCanvas'));

PHP (BaconQrCode / Endroid):

// Generate QR in PHP
$renderer = new \BaconQrCode\Renderer\ImageRenderer(
    new \BaconQrCode\Renderer\RendererStyle\RendererStyle(300),
    new \BaconQrCode\Renderer\Image\SvgImageBackEnd()
);
$writer = new \BaconQrCode\Writer($renderer);
echo $writer->writeString('https://technolila.com');

QR Code Generator Example

Example Input:

https://technolila.com

Example Output:

Generated 256x256 Canvas QR Code

Common Use Cases

Marketing flyers, restaurant digital menus, contact exchange via vCard, seamless guest Wi-Fi connection, payment collection (crypto/UPI), product user manuals, event ticketing, and packaging labels.

Common Mistakes & Gotchas

1. Using low Error Correction Level (L) when adding center logos (always use Q or H level so covered modules can be mathematically reconstructed).
2. Low contrast between foreground and background (e.g., light gray on white).
3. Inverting colors (white QR on dark background can fail on older camera apps; dark QR on light background is universally supported).
4. Entering excessively long URLs without short links, resulting in overly dense module grids that are difficult to scan from a distance.

Frequently Asked Questions

How does the Wi-Fi QR code work on smartphones?

When an iOS (iPhone) or Android user scans a Wi-Fi QR code with their default camera app, the phone automatically recognizes the WIFI protocol and displays a one-tap "Join Network" prompt without needing to manually type passwords.

Do QR codes created on TechnoLila ever expire?

No. TechnoLila generates 100% static QR codes. Your data (URL, text, vCard, Wi-Fi credentials) is encoded directly into the geometric matrix of the QR code itself. Because there is no intermediary redirect server, the QR code works indefinitely.

Which Error Correction Level should I choose?

QR codes have 4 Reed-Solomon error correction levels: L (7% recovery, smallest size), M (15% recovery, default for general use), Q (25% recovery, recommended when adding logos), and H (30% recovery, best for industrial or high-wear environments).

How do I add a logo to my QR code without breaking scannability?

When you upload or select a center logo, our generator automatically sets the error correction to Level Q or H (25-30% redundancy) and creates a clean quiet buffer around the icon, ensuring camera scanners can read the surrounding data modules effortlessly.

Can I export vector SVG QR codes for large billboards or print flyers?

Yes. Click "Download SVG" to get a scalable vector graphic file that renders razor-sharp at any billboard, poster, or magazine print dimensions.

Is my Wi-Fi password or contact vCard uploaded to any server?

Never. The QR code generation algorithm runs entirely client-side in your browser using JavaScript. No sensitive network credentials or contact records leave your device.

Can I generate multiple QR codes in bulk?

Yes. Toggle "Batch Mode" to enter multiple URLs or text entries and instantly generate and print a batch card grid.

What size should a printed QR code be?

For optimal scan reliability, the printed QR code size should follow a 10:1 scanning ratio. For example, if users scan from 1 meter (100 cm) away, the QR code should be at least 10 cm x 10 cm (4 inches). For handheld business cards scanned at 15-20 cm, 2 cm x 2 cm (0.8 inches) is ideal.