Modembin – A pastebin that encodes your text into real FSK modem audio
A fun weekend project: https://www.modembin.com It'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…
Modembin – A pastebin that encodes your text into real FSK modem audio launched on March 6, 2026 with 27 votes, #800 of 23,380 launches that month and more than 95% of that year's launches.
In plain words
Modembin is a pastebin that encodes text and files into FSK modem audio files playable as .wav format. It supports multiple encoding standards including Bell 103 and 1200-baud formats, plus image sharing via Slow-Scan Television (SSTV) and a chat mode that transmits messages as actual modem audio. The tool runs entirely in the browser using TypeScript sine wave mathematics with no external audio libraries, making it suitable for users interested in retro communication protocols and hobbyist radio transmission methods.
written from the facts on this page · September 2026
From the sources
Like pastebin, but it screams at you in modem. Encode text as real FSK audio, DTMF, blue box tones, and SSTV — decode it back. All in the browser.
In the maker’s words, at launch
A fun weekend project: https://www.modembin.com It'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…
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