Modembin
A pastebin that encodes your text into real FSK modem audio
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Hey HN,A fun weekend project: https://www.modembin.comIt's a pastebin, except text/files are encoded into .wav files using real FSK modem audio. Image sharing is supported via Slow-Scan Television (SSTV), a method of transmitting images as FM audio originally used by ham radio operators.Everything runs in the browser with zero audio libraries and the encoding is vanilla TypeScript sine wave math: phase-continuous FSK with proper 8-N-1 framing, fractional bit accumulation for non-integer sample rates, and a quadrature FM discriminator on the decode side (no FFT windowing or Goertzel), The only dependency is lz-string for URL sharing compression.It supports Bell 103 (300 baud), Bell 202 (1200 baud), V.21, RTTY/Baudot, Caller ID (Bellcore MDMF), DTMF, Blue Box MF tones, and SSTV image encoding. There's also a chat mode where messages are transmitted as actual Bell 103 audio over WebSocket... or use the acoustic mode for speaker-to-mic coupling for in-room local chat.
HN · launched Mar 3, 2026 · 13 upvotes (top 33%) · 2 views
Niche: audio editing and processing utilities · 217 launches, 23 in the last 7 days ▼ -30% · Explore this niche →
Category and tags
- Horizontal
- Communication
- Prosumer
- Not AI
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 217 launches in audio editing and processing utilities →
Could you build this?
Yes The project encodes text and images into standard audio formats (FSK audio, SSTV) and serves them via a simple web frontend, which can be generated using standard DSP algorithms in JavaScript or Python.
Discussion
1 comment analyzed.
Competitors
Other products that read as similar to this one : 132 launches clear the similarity bar, closest 8 shown.
Attention rank: #39 of 133 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 116 days after the earliest competitor.
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