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mp3fy

Files never leave your device. Any size, any length.

Any file to MP3.
No size, no length limits.

Converted on your device, nothing uploaded. The cloud steps in only for formats your browser can’t read. Free, no sign-up.

How it works

  1. Pick a file, or drop in a whole folder.
  2. It converts right in your browser. The work runs on your own processor and nothing is uploaded.
  3. Save the MP3. Tags and cover art carry over when the source has them.

A handful of formats can’t be decoded by browsers at all. Those go to mp3fy’s cloud instead: the row says so while it happens, and the upload is deleted as soon as the conversion ends.

Your files stay yours

A normal conversion never leaves your device. The file is read locally, the MP3 lands in your browser’s private storage, and mp3fy’s servers see neither one. There is nothing to upload, so there is nothing to leak, sell or keep.

Cloud conversions are the exception, and they are built to forget: uploads are deleted right after the job, results expire within a day, and no account ties any of it to you. Read the privacy policy.

What it converts

More than forty formats: the audio families (WAV, FLAC, M4A, OGG, WMA and company) and the video containers phones and cameras produce, from which the audio track is pulled. Every format has its own page explaining what it is and how mp3fy handles it.

Questions

Is mp3fy free?

Yes. Conversions are unlimited, and there is no account and no paid tier. The servers are paid for by donations from people who find it useful.

Is there a file-size or length limit?

No. The converter processes the file in chunks instead of loading it into memory, so a 3 GB recording or a 10 hour audiobook converts the same way a 3 MB song does.

Will the audio lose quality?

MP3 is a lossy format: the encoder keeps what you hear and drops what you don’t. From a clean source, at 256 or 320 kbps the difference is inaudible to almost everyone. Converting an MP3 into another MP3 does re-encode it, though, so keep the original when you can.

Why did my file convert in the cloud?

Browsers can’t decode some formats, WMA and DTS among them. Those files upload over an encrypted connection, convert on our servers, and the upload is deleted the moment the job finishes. The row tells you while it happens, and a switch in the options row sends everything to the cloud if you prefer.

Does it work offline?

Device conversions do. Once the page has loaded, or the app is installed, the encoder runs without a connection. Only the cloud formats need the network.

Can I convert video to MP3?

Yes. Drop in an MP4, a MOV or any other video, and the audio track comes out as an MP3.