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▶ Developer Tools for Random Data Generation // v2.13.1
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Random QR Code Generator

Generate random QR codes with cryptographic security and custom encoding options

Our random QR code generator helps you generate random QR codes with cryptographic security and customizable encoding options. Generate-Random.org provides a free QR code generator that creates scannable QR codes with adjustable error correction, size, and format options. This random QR code generator uses cryptographically secure data generation for maximum security—perfect for URLs, contact information, barcode generation, mobile apps, and authentication systems. Generate QR codes instantly with multiple error correction levels and export formats. No signup required, completely free. For structured data, try our string generator.

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$ generate --type=barcode --format=ean13
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STRING GENERATOR →

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What is a QR Code Generator?

A QR code generator is a tool that creates two-dimensional barcodes that can be scanned by smartphones and QR code readers. Our generator uses cryptographically secure data generation to create unique QR codes with customizable error correction levels and encoding formats.

Unlike basic QR code tools, our generator supports multiple error correction levels (L, M, Q, H), adjustable sizes, and export formats (PNG, SVG). Perfect for marketing campaigns, product packaging, contactless payments, and authentication. For one-dimensional barcodes, explore our barcode generator.

QR Code Generator Configuration Options

QR Code Data (Text, URL, vCard)

Enter any data to encode: URLs, plain text, contact information (vCard), Wi-Fi credentials, email addresses, phone numbers, or custom JSON payloads. Maximum 2000 characters supported.

Error Correction Level (L, M, Q, H)

Choose error correction: L (Low ~7%), M (Medium ~15%), Q (Quartile ~25%), or H (High ~30%). Higher levels allow QR codes to remain scannable even when partially damaged or obscured.

Size & Margin

Customize QR code size (100-1000px) and quiet zone margin (0-50px). Standard 300px size recommended for print, with 10px margin for reliable scanning. Larger sizes improve scannability at distance.

Image Format (PNG, SVG)

Export as raster image (PNG) for print or vector graphic (SVG) for web and scalable designs. PNG recommended for physical printing, SVG for digital applications and responsive designs.

How to Generate Random QR Codes

[STEP 1] Enter Data to Encode

Input the content for your QR code: URL, text, vCard, Wi-Fi config, or any custom data up to 2000 characters. The generator will automatically optimize encoding.

[STEP 1] Configure Options

Set error correction level (L/M/Q/H), size (100-1000px), margin, and image format (PNG/SVG). Higher error correction enables scanning even if QR code is partially damaged.

[STEP 1] Generate & Download

Click generate to create scannable QR codes. Download individual images or export multiple QR codes in ZIP format. Test with smartphone camera to verify scannability.

QR Code Best Practices

  • _ Use L (Low) for clean environments, M (Medium) for general use, Q (Quartile) for outdoor or printed materials, and H (High) when QR code may be damaged, dirty, or have logos embedded.
  • _ Minimum 2cm x 2cm for print at normal viewing distance. Larger QR codes (5cm+) for billboards or distance scanning. Digital QR codes should be at least 300x300px for reliable smartphone scanning.
  • _ Always test QR codes with multiple smartphone cameras and QR reader apps. Verify scannability in different lighting conditions. Check that encoded data is correct and URLs are accessible.
  • _ Maintain adequate white space (quiet zone) around QR code—minimum 4 modules (squares) on all sides. Our generator defaults to 10px margin for reliable scanning. Never crop the quiet zone.

Technical Details: QR Code Generation

Our QR code generator uses the Endroid QR Code library with Reed-Solomon error correction following ISO/IEC 18004 standards. The system automatically selects optimal encoding modes (numeric, alphanumeric, byte, kanji), calculates required QR version (1-40), and renders scannable codes with customizable error correction levels.

// Error Correction Levels (Reed-Solomon)
L (Low):      ~7% data recovery
M (Medium):   ~15% data recovery (recommended)
Q (Quartile): ~25% data recovery
H (High):     ~30% data recovery

// QR Code Versions & Capacity
Version 1:  21×21 modules, 41 numeric chars (L)
Version 10: 57×57 modules, 1273 numeric chars (L)
Version 40: 177×177 modules, 7089 numeric chars (L)

// Encoding Modes (auto-selected)
Numeric:      0-9 (3.33 bits/char)
Alphanumeric: 0-9, A-Z, space, $%*+-./:
Byte:         ISO-8859-1, UTF-8
Kanji:        Shift JIS X 0208

// Generation Process
1. Encode data using optimal mode
2. Add error correction codewords
3. Structure final message
4. Create QR matrix with finder patterns
5. Apply mask pattern for readability
6. Render as PNG/SVG with quiet zone

Standards: ISO/IEC 18004:2015
Library: Endroid QR Code v6.0

API Access for Developers

GET https://generate-random.org/api/v1/generate/qr-codes
VIEW FULL API DOCUMENTATION →

QR Code Generator FAQ

What is the difference between QR codes and barcodes? ▶
QR codes are two-dimensional (2D) matrix barcodes that can store much more data than traditional one-dimensional barcodes. QR codes can encode URLs, text, contact info, and up to 7089 characters, while standard barcodes (like EAN-13) typically store 8-13 digits. QR codes also include error correction, allowing them to be scanned even when partially damaged. For 1D barcodes, use our barcode generator.
What error correction level should I use? ▶
Use L (Low, ~7%) for clean indoor environments with perfect printing. M (Medium, ~15%) is recommended for general use and standard marketing materials. Q (Quartile, ~25%) works well for outdoor posters or when adding small logos. H (High, ~30%) is best for harsh environments, small QR codes, or when embedding logos/images within the QR code. Higher error correction creates larger, denser QR codes.
How can I generate QR codes with custom data? ▶
Simply enter any text in the data field: URLs (https://example.com), plain text, vCard contact info, Wi-Fi credentials (WIFI:S:NetworkName;T:WPA;P:password;;), email addresses (mailto:user@example.com), phone numbers (tel:+1234567890), or custom JSON. Our generator supports up to 2000 characters and automatically optimizes encoding for your data type. UTF-8 encoding supports international characters.
Can I generate multiple unique QR codes at once? ▶
Yes! Set the count parameter (1-50) to generate multiple QR codes. When generating multiple codes, each will be uniquely numbered (e.g., "Your Data #1", "Your Data #2") to ensure uniqueness. You can download all QR codes as a ZIP archive or export individual images. Perfect for event tickets, product serialization, or batch marketing campaigns.
What size should my QR code be for printing? ▶
Minimum 2cm x 2cm (0.8" x 0.8") for business cards and close-range scanning. 5cm x 5cm (2" x 2") for posters and medium-distance scanning. 10cm+ (4"+) for billboards or long-distance scanning. Our generator supports 100-1000px sizes. For high-quality printing, use PNG format at 300 DPI or SVG for perfect scalability. Always include adequate quiet zone (margin).
Are the QR codes generated truly random and unique? ▶
Our QR code generator uses cryptographically secure random number generation (CSPRNG) for any random components. When you provide custom data, that exact data is encoded. When generating multiple QR codes, each is made unique by appending sequential numbering. The encoding process follows ISO/IEC 18004 standards ensuring compatibility with all QR code scanners worldwide. For unique identifiers, combine with our UUID generator.