Radio sound tools that never upload a thing.
Four free tools for anyone who needs audio that sounds like it came over the air. Everything is synthesised and processed on your own machine. No account, no upload, no watermark.
Radio Voice Effect
Record or upload a clip and run it through a police radio, walkie-talkie, CB, aircraft set or vintage AM receiver. Download the result as a WAV.
Open tool →Morse Code Translator
Translate text to Morse and back, then hear it keyed at any speed with proper Farnsworth timing. Export the CW as an audio file.
Open tool →Numbers Station Generator
Turn a message into five-figure groups and broadcast it over shortwave atmosphere, complete with an interval signal and call-up.
Open tool →Morse Decoder
Point it at a recording and read the message back. Finds the tone and the keying speed on its own, and copes with Farnsworth spacing.
Open tool →SSTV Encoder
Turn a picture into a slow-scan television transmission in eleven modes, from a 50 second PD50 to a full Martin M1.
Open tool →Radio Sound Library
Fifteen synthesised radio sounds: roger beeps, squelch tails, static, tuning sweeps and alert tones. Public domain, no attribution needed.
Open tool →Why these run locally
Most online audio tools make you upload a file to a server, wait in a queue, and accept a watermark or a sign-up wall. None of that is necessary for this kind of work.
Nothing leaves the browser
Your recording is decoded, filtered and re-encoded by the Web Audio API on your own device. There is no server to send it to.
Real WAV files out
Every tool renders offline and hands you a 16-bit WAV. Drop it straight into a video editor, a game engine or a podcast timeline.
Free to use commercially
Audio you make here is yours. The sound library is released under CC0, so it needs no credit line even in paid work.
Who uses this
The tools were built for the jobs that keep coming up in production work and in the radio hobby:
- Video editors and filmmakers who need one line of dialogue to sound like it came through a handheld radio, without opening a full audio suite.
- Game developers who need squelch tails and roger beeps that are cleared for commercial release.
- Podcasters making a caller or a field report sound like a live link.
- Tabletop and live-action game hosts who need a coded transmission their players can actually decode.
- Amateur radio operators practising Morse at a set character speed.
What you need
A current browser. Recording needs microphone permission, which the browser asks for and you can refuse; you can upload a file instead. Everything else works with no permissions at all.