FT8/FT4 Browser Decoder icon

FT8/FT4 Browser Decoder

v1.2.0 Updated Jan 11, 2026 693KiB
CWS
31
Users
★ 3.00
2 reviews
#33267
of 75.8K
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#8470 of 23.3K

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
FT8/FT4 Browser Decoder screenshot 1

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Permissions (2)

Permissions

activeTab Can access the current tab when you click the extension tabCapture Can capture tab audio/video

Details

Version 1.2.0
Updated Jan 11, 2026
Size 693KiB
First Seen Mar 26, 2026