📡 Optical QR Transfer Pro

📤 Optical QR Sender

TEXT MODE
FILE MODE
10 FPS
How many times to repeat transmission for reliability
⚡ Rendering: Canvas-based QR (fast) | Speed: 1-60 FPS adjustable | Reliability: CRC checksums included
📱
Click START TX to begin transmission
Ready
Data Size
0 B
Total Frames
0
Frame Sent
0
Loop
0/3
💡 Tips for Best Results:
• Maximum screen brightness recommended
• Keep camera steady (use phone stand if possible)
• Adjust FPS based on camera quality (start slow, increase gradually)
• Start receiver BEFORE starting transmission
• Increase loops for unreliable lighting conditions

📹 Optical QR Receiver

Frames Decoded
0
Expected Frames
?
Data Size
0 B
CRC Status
—
Waiting for QR codes...

ℹ️ How It Works

📡 Technology Overview

Transfer data via animated QR codes using screen + camera, with no network needed. Perfect for air-gapped systems, data isolation, or just for fun! Data travels as light waves.

🔄 Transmission Protocol

Frame Format:
[HEADER]|[SESSION_ID]|[FRAME_NUM]|[TOTAL]|[IS_FILE]|[FILENAME_LEN]|[FILENAME]|[CRC]|[DATA]

✓ Full metadata for integrity checking
✓ CRC32 ensures data wasn't corrupted
✓ Frame count known in advance
✓ Supports multiple transmission loops
✓ File metadata included when transmitting files

⚡ Performance Specifications

  • ✅ Speed Range: 1-60 FPS (ultra-slow to extreme)
  • ✅ Frame Sizes: 30-200 bytes configurable
  • ✅ Canvas-based QR rendering (no flicker)
  • ✅ Proper FPS throttling (not monitor refresh rate)
  • ✅ Automatic transmission stop after loops
  • ✅ Frame duplicate detection
  • ✅ Data integrity verification via CRC32
  • ✅ Auto-detection of transmission completion
  • ✅ File transfer with metadata preservation
  • ✅ Memory efficient streaming

📝 Text Mode

Perfect for:

  • Messages and notes
  • URLs and commands
  • Configuration data
  • Small text documents

📁 File Mode

Transfer any file:

  • Documents (PDF, DOCX, etc.)
  • Images (PNG, JPG, etc.)
  • Archives (ZIP, TAR, etc.)
  • Any binary file up to several MB

Note: File size affects transmission time. Calculate: (File Size ÷ Frame Size) ÷ FPS = Transfer Time

💡 Tips for Best Results

  • 🔆 Maximum screen brightness essential
  • 📸 Steady camera position (use phone stand)
  • ⚙️ Start with 100 bytes/frame and 10 FPS
  • 🎨 Colored QR codes help camera focus
  • 📏 Increase loops (3-5) for unreliable conditions
  • 🎯 Good ambient lighting essential
  • 🚀 Increase FPS gradually if transmission succeeds
  • 🐢 Reduce FPS for poor lighting or camera

📊 Speed Guide

FPS Use Case Conditions
1-5 FPS Ultra-reliable Poor lighting, slow camera
10-15 FPS Balanced Normal conditions
20-30 FPS Fast Good conditions, fast camera
45-60 FPS Extreme speed Optimal conditions only