No upload, 100% local, no account

Audio converter

Convert audio to MP3, WAV or AAC and pick the bitrate. Everything runs in your browser, your file never leaves your device.

How Audio converter works

Audio converter transcodes any audio file to MP3, WAV or AAC entirely in your browser, powered by FFmpeg compiled to WebAssembly. Drop a voice memo, a studio recording or a podcast export and receive the converted file as a local download.

MP3 is the most compatible choice at small sizes, WAV is uncompressed and lossless for further editing, and AAC gives better quality than MP3 at the same bitrate. FFmpeg in WebAssembly is somewhat slower than native, so large or high-bitrate files take proportionally longer, with progress shown throughout.

Frequently asked questions

Are my files uploaded to a server?

No. ffmpeg compiled to WebAssembly converts your audio in this browser tab, the file is read into memory on your own device and re-encoded there to the format you pick (libmp3lame for MP3, pcm_s16le for WAV, or the native AAC encoder), and the result is offered as a local download. Nothing reaches Sunasty or any third party. Open your browser's DevTools, go to the Network tab and watch: no request carries your audio.

Which output format should I choose, MP3, WAV or AAC?

MP3 is the most universally compatible format and gives good quality at small file sizes, the best default for sharing or streaming. WAV is uncompressed and lossless, ideal when you need to preserve quality for further editing. AAC offers better quality than MP3 at the same bitrate and is the native format for Apple devices and modern streaming platforms.

Why does conversion take longer for large files?

The conversion runs FFmpeg inside your browser via WebAssembly, which is somewhat slower than native FFmpeg. Large or high-bitrate files take proportionally more time. Progress is shown throughout so you can track the operation.

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.