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Overview

The QR Code Reader/Generator provides bidirectional QR code functionality: encode text into QR codes and decode QR codes from images. Perfect for creating shareable links, encoding data, or reading QR codes from screenshots.

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Use Cases

  • URL Sharing: Generate QR codes for websites, app deep links, or landing pages
  • Data Encoding: Encode contact information (vCards), WiFi credentials, or configuration data
  • Event Management: Create QR codes for tickets, check-ins, or registration
  • Documentation: Decode QR codes from screenshots or images for inspection
  • Testing: Generate test QR codes for mobile app development

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Input Format

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For Generation

Enter any text to encode as a QR code: 
https://example.com

BEGIN:VCARD
VERSION:3.0
FN:John Doe
TEL:+1-555-0100
EMAIL:john@example.com
END:VCARD

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For Decoding

Paste an image containing a QR code, or upload an image file through the UI.

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Output Format

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Generation

Produces a visual QR code image that can be:
  • Downloaded as PNG
  • Copied to clipboard
  • Scanned by mobile devices

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Decoding

Extracts the text content from the QR code: 
https://example.com/path?param=value

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Examples

https://kaystons-forge.dev

WIFI:T:WPA;S:MyNetwork;P:MyPassword;;

BEGIN:VCARD
VERSION:3.0
FN:Jane Smith
ORG:Acme Corp
TEL:+1-555-0199
EMAIL:jane.smith@acme.com
URL:https://acme.com
END:VCARD

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Features

  • High Compatibility: Generated QR codes work with all standard readers
  • Error Correction: Built-in error correction for robust scanning
  • Large Data Support: Handles URLs, vCards, structured data
  • Image Decoding: Reads QR codes from uploaded images or pasted screenshots
  • Export Options: Download as PNG or copy to clipboard

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QR Code Formats

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URL

https://example.com

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Email

mailto:user@example.com?subject=Hello&body=Message

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SMS

smsto:+1-555-0100:Hello from QR code

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Phone

tel:+1-555-0100

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WiFi

WIFI:T:WPA;S:NetworkName;P:Password;H:false;;

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vCard

BEGIN:VCARD
VERSION:3.0
FN:Full Name
TEL:+1-555-0100
EMAIL:email@example.com
END:VCARD

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Implementation Details

From lib/tools/engine.ts:563-564: 
case 'qr-code':
  return { output: input };
The QR generation and decoding logic is implemented in the UI component using the qrcode and jsqr libraries:
  • qrcode: Generates QR code images from text
  • jsqr: Decodes QR codes from image data
QR codes can store up to approximately 3KB of data, depending on error correction level. For optimal scanning, use high contrast and adequate size.
Do not encode sensitive information (passwords, API keys, private keys) in QR codes that will be shared publicly or scanned by untrusted devices.