Description
FT8/FT4 Browser Decoder decodes FT8 and FT4 directly from browser tab audio.
FEATURES:
• Real-time FT8 and FT4 decoding using WebAssembly
• Waterfall spectrum display (200-3000 Hz)
• Automatic time synchronization
• CSV export of decoded messages
• CQ message filter
USAGE:
1. Open a WebSDR (websdr.org, kiwisdr.com, etc.)
2. Tune to an FT8/FT4 frequency:
- FT8: 7.074, 10.136, 14.074 MHz USB
- FT4: 7.0475, 10.140, 14.080 MHz USB
3. Click the extension icon
4. Click Start
DETAILS:
• Sample rate: 12000 Hz
• Slot time: 15s (FT8) / 7s (FT4)
• Decoder: ft8js WASM library
PRIVACY:
• No data collection
• No external servers
• No tracking or analytics
• All processing happens locally in your browser
OPEN SOURCE:
MIT License - Contributions welcome
https://github.com/Transwarp8/ChromeFT8
Reviews
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Permissions (2)
Permissions
activeTabℹ Can access the current tab when you click the extension tabCaptureℹ Can capture tab audio/video
Details
| Version | 1.2.0 |
| Updated | Jan 11, 2026 |
| Size | 693KiB |
| First Seen | Mar 26, 2026 |
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