QR Code Generator & Scanner

Complete QR Code Guide

Welcome to 21K Tools' professional QR Code Generator & Scanner. Whether you're creating QR codes for marketing, sharing files, or scanning codes for information, our tool provides a complete, secure, and user-friendly solution.

What is a QR Code?

QR (Quick Response) codes are two-dimensional barcodes that can store various types of data including text, URLs, contact information, and file links. They can be scanned using smartphone cameras or dedicated QR code readers, making them perfect for bridging physical and digital experiences.

QR Code Generator Features

Text & URL QR Codes

Create QR codes from any text or URL instantly. Perfect for:

• Website links and landing pages
• Contact information (vCard format)
• WiFi credentials
• Plain text messages
• Social media profiles
• Email addresses with pre-filled subjects

File Upload QR Codes

Upload files to Cloudinary and generate QR codes that link directly to them. Supported file types:

• Images: JPEG, PNG, GIF, WebP
• Videos: MP4, MPEG, QuickTime
• Documents: PDF, DOC, DOCX
• Size Limit: Up to 10MB per file

Customization Options

Tailor your QR codes to your needs:

• Size Options: Small (200x200), Medium (250x250), Large (300x300)
• Error Correction: Choose from Low (7%), Medium (15%), Quartile (25%), or High (30%) - higher levels allow QR codes to work even if partially damaged
• Professional Colors: All QR codes use our signature blue color scheme for consistency

QR Code Scanner Features

Camera Scanning

Use your device's camera to scan QR codes in real-time:

• Instant detection and decoding
• Works with front and rear cameras
• Automatic URL detection and opening
• Copy results to clipboard

Image Upload Scanning

Already have a QR code image? Upload it for instant scanning:

• Support for all common image formats
• Works with screenshots and photos
• Fast processing and accurate results
• No quality loss during scanning

How to Use

Generating QR Codes

1. Choose Input Method: Enter text/URL or upload a file
2. Configure Options: Select size and error correction level
3. Generate: Click the generate button
4. Download: Save your QR code as PNG image

Scanning QR Codes

1. Start Camera: Allow camera access when prompted
2. Position QR Code: Center the QR code in your camera view
3. Automatic Detection: The scanner automatically detects and decodes
4. View Results: See decoded text or open URLs directly

Best Practices

• Test Before Printing: Always test QR codes before mass printing
• Adequate Size: Ensure QR codes are at least 2x2 cm when printed
• High Contrast: Use dark QR codes on light backgrounds
• Error Correction: Use higher error correction for printed materials
• Clear Space: Leave white space around QR codes for better scanning
• Test Distance: Test scanning from expected user distances

Common Use Cases

Business & Marketing

• Product packaging with links to manuals or videos
• Business cards with contact information
• Restaurant menus and ordering systems
• Event tickets and registrations
• Promotional materials and advertisements

Personal Use

• Share WiFi passwords easily
• Wedding invitations with RSVP links
• Share photos and videos with friends
• Create treasure hunts and games
• Share social media profiles

Education

• Link to online resources and assignments
• Interactive worksheets and activities
• Library book tracking
• Student project presentations
• Campus navigation and information

Technical Specifications

• QR Code Standard: ISO/IEC 18004:2015 compliant
• Output Format: PNG image with transparent or white background
• Resolution: High-resolution suitable for printing
• Color: Professional blue (#1e3a8a) on white background
• File Storage: Cloudinary secure cloud storage
• Scanner Library: jsQR - industry-standard JavaScript decoder

Troubleshooting

QR Code Won't Scan

• Ensure adequate lighting when scanning
• Check if QR code is damaged or obscured
• Try different angles and distances
• Clean camera lens
• Use higher error correction when generating

File Upload Issues

• Check file size is under 10MB
• Verify file format is supported
• Ensure stable internet connection
• Try uploading a different file
• Clear browser cache and try again

Camera Not Working

• Grant camera permissions in browser settings
• Check if camera is being used by another app
• Try using a different browser
• Restart your device
• Use the image upload option instead

Frequently Asked Questions

Q: Are QR codes free to create?
A: Yes! Our QR code generator is 100% free with unlimited usage.

Q: Do QR codes expire?
A: Static QR codes (text/URL) never expire. File-based QR codes depend on Cloudinary's storage retention.

Q: Can I edit a QR code after creating it?
A: No, QR codes are static. You need to generate a new QR code for different content.

Q: What's the maximum data capacity?
A: QR codes can store up to 4,296 alphanumeric characters, though smaller amounts scan more reliably.

Q: Can I use QR codes commercially?
A: Yes! QR codes are not proprietary and can be used for any purpose including commercial use.

Q: Do I need an app to scan QR codes?
A: Most modern smartphones can scan QR codes directly with their native camera app, or you can use our web-based scanner.

Get Started Now

Ready to create your first QR code? Our intuitive interface makes it easy. Simply switch to the "Generate QR Code" tab above, enter your data, and click generate. For scanning, switch to the "Scan QR Code" tab and follow the prompts.

Need help? Our tool includes helpful tooltips and error messages to guide you through every step. For additional support, visit our help center or contact our support team.