Audio converter
Drop in any sound your browser can play — MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or a video whose soundtrack you want — and get MP3, WAV or FLAC back. Change the sample rate and switch between mono and stereo while you are at it. Everything happens on your own device; the file is never uploaded.
How it works
Your browser already knows how to read almost every sound file you own, so that is what does the reading here — nothing is uploaded and nothing is installed. Writing the new file happens on your device too: MP3 when you want something small that plays anywhere, WAV when you want the raw audio with nothing thrown away, and FLAC when you want that same untouched quality at roughly half the size. Converting a compressed file to WAV or FLAC does not put back detail that was already lost — it just stops losing more.
Which files can I put in?
Anything your browser can play: MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WebM, and video files, from which the soundtrack is taken. WMA is the one common exception — no browser can read it, so neither can we.
Why can I not convert to M4A or WMA?
Writing M4A means shipping an AAC encoder, and that needs a paid patent licence — we would rather leave the format out than pass that cost on or take the risk. WMA is Microsoft's own format and no free encoder exists. Reading both is fine, because there your browser does the work with the licence it already has.
Will converting to WAV or FLAC improve my MP3?
No, and be careful with any site that suggests it will. An MP3 has permanently thrown away part of the sound; a lossless format simply keeps whatever it is given. It is worth doing when you want to edit further without losing more quality, not to repair what is already gone.
What do the sample rate and channel settings do?
Sample rate is how many times per second the sound was measured — 44 100 Hz is CD quality, 16 000 Hz is plenty for speech and makes a much smaller file. Channels switches between one (mono) and two (stereo); making a spoken recording mono roughly halves the size and costs you nothing. One thing worth knowing: your browser decodes every file at your device's own rate, usually 48 000 Hz, so "keep as is" means that rate rather than the number the original file happened to carry. If you need a specific one, pick it from the list.
