Free audio tools that run in your browser
Toolvy’s audio tools do the everyday jobs — convert a format, trim a clip, compress a file for email, make a ringtone, even out loudness — without uploading anything. They are built on ffmpeg compiled to WebAssembly, the same engine desktop apps use, running inside a Web Worker on your own machine. Your recordings, interviews and music never touch a server, which you can verify by watching the Network tab while you work.
The engine downloads once (about 10 MB) on your first file interaction and is then shared across every audio and video tool for the rest of your visit, so the second job is instant. Nothing loads until you actually pick a file — opening this page, or any other page on the site, downloads none of it.
Convert, compress and edit
The most common job is conversion: use the audio converter for any pair, or a dedicated page like WAV to MP3. To make a file smaller, the audio compressor lowers the bitrate with a live size preview. To cut a clip, the audio trimmer gives you a waveform with draggable start and end points. When you are working with a video, you can also extract its audio as MP3 and bring it here.