Turn almost any audio file into an MP3 or a WAV, and change its sample rate or channels on the way. Nothing is uploaded.
Whatever your browser can play, this can convert. MP3 encoding uses the LAME encoder compiled to JavaScript, served from this site itself — so it keeps working offline and behind blockers.
The Audio Converter reads the awkward formats — M4A from a voice memo, OPUS from a chat app, FLAC from a music archive — and gives you back a plain MP3 or WAV that opens anywhere.
Conversion happens in your browser using the same audio engine that plays music on web pages, so anything your browser can play, this can read: MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, WEBM, AIFF and the audio track inside a video file. Output is MP3 (64–320 kbps) or WAV (uncompressed).
You can also change the sample rate — how many times a second the sound was measured — and the channels. Dropping a stereo voice recording to mono at 16 kHz can shrink it by ten times or more without hurting speech at all, which is handy when a form or an email will not accept a big file.
Anything your browser can play — MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, WEBM, AIFF and the soundtrack of most video files. Support varies slightly between Chrome, Safari and Firefox; if one refuses a file, another usually takes it.
MP3 and WAV. These two cover almost every use, and both are written locally with no server involved. Formats like AAC and OGG cannot be encoded reliably in a browser without a very large extra download, so they are not offered.
Yes. MP3 throws away detail to make the file smaller — that is the point of it. At 256 or 320 kbps the difference is very hard to hear. Choose WAV if you need a bit-for-bit faithful copy.
The MP3 encoder runs in JavaScript inside your browser rather than on a server. It works at roughly ten to twenty times real time, so a four-minute song takes a handful of seconds. The progress bar shows exactly where it is.
No. The audio is decoded to raw sound and re-encoded, which drops the original metadata. Add tags afterwards in your music player if you need them.