Audio to MP3 Converter
Convert any audio file your browser can play into an MP3.
File
Result
Your converted file will appear here.
About the Audio to MP3 converter
MP3 is still the format that plays on absolutely everything — car stereos, old phones, DJ gear, cheap hardware players. This converter takes whatever audio you have and produces one.
Any format your browser can decode is accepted, which in practice means almost anything you are likely to have.
When MP3 is the right choice
Choose MP3 for maximum compatibility. Nothing else is as universally supported, and it is the safe answer whenever you do not control what will play the file.
If the destination is modern — a website, a phone app, a podcast host — AAC or Opus reach the same quality in a smaller file. MP3 wins on reach, not on efficiency.
Choosing a bitrate
192 kbps is the sensible default for music — most listeners cannot reliably tell it from the source on ordinary equipment. 320 kbps is the ceiling MP3 allows and worth it if the file is going to be archived or edited further.
For speech — interviews, lectures, podcasts, voice notes — 96 kbps mono is plenty and produces a file several times smaller. Music at that rate starts to sound obviously thin, particularly in cymbals and reverb tails.
How the conversion works
Your browser decodes the file with the Web Audio API — the same decoder it uses to play media — which hands back raw PCM samples. Those samples are then re-encoded into the output format.
MP3 encoding uses LAME compiled to JavaScript, running in a background worker so a long file does not freeze the page. Nothing is uploaded: no server sees the audio, there is no queue, and there is no processing limit beyond your own device.
Frequently asked questions
What formats can I convert from?
WAV, M4A, AAC, OGG, Opus, FLAC, WebM and MP3 itself, plus the audio track of any video. The browser does the decoding, so support matches what it can play.
Will converting reduce the quality?
Re-encoding lossy audio always loses a little, because the encoder is working from what survived the first compression rather than from the original. Keep the bitrate at or above the source and it will not be audible. Converting from a lossless source such as WAV or FLAC has no such problem.
Can I convert several files at once?
Not yet — one file at a time. Batch conversion is on the roadmap.
Is my file uploaded?
No. Decoding and encoding both happen in your browser. The audio never leaves your device, which is why there is no size limit imposed by a server.