Free Online Audio Converter

No. The conversion runs in your browser using FFmpeg compiled to WebAssembly. Your files never leave the device, which is also why the first conversion takes a moment - the engine has to download itself before it can start.

MP3, WAV, OGG, FLAC, AAC, M4A and WebM, in any direction. WAV and FLAC are lossless, so they produce much larger files than MP3 or AAC at the same length.

The FFmpeg engine is around 25 MB and downloads the first time you convert something. After that it is cached by the browser, so later conversions in the same session start immediately.

No. MP3 is a lossy format, and the detail thrown away when it was first encoded cannot be recovered. Converting to WAV gives you a much larger file holding exactly the same audio. Convert to a lossless format only when a program you use refuses to read MP3.

There is no fixed limit, but everything is held in browser memory, so very large files can exhaust the tab on a phone or a low-memory machine. Files under roughly 100 MB are comfortable on most devices.

VBR, variable bitrate, spends more data on complex passages and less on quiet ones, so you get better sound for the same file size. CBR, constant bitrate, holds one rate throughout and is the safer choice for streaming or for old hardware players. For music, VBR at V0 to V2 is the usual pick.

For archiving, FLAC - it is lossless and roughly half the size of WAV. For everyday listening, MP3 at VBR V0 to V2, or AAC around 256 kbps. For the smallest files that still sound acceptable, OGG Vorbis at quality 6.

Yes. Your browser will ask before recording starts, and the recording stays on your device like everything else here. Nothing is transmitted.

That is usually a missing codec rather than a broken file. Our Codec Finder identifies what a file needs and points at the download for it.