Convert MP4 to MP3 — Free & Private

Most converters make you upload the video first. This one pulls the audio out the moment you pick the MP4 — no upload, no account, and the file never leaves your device.

Convert MP4 to MP3 →
  • No upload wait
  • Nothing leaves your device
  • Free, no account
  • No artificial size limits

Turn any MP4 into an audio file

MP4 is a video container, but a lot of the time you only want the sound: a lecture or meeting recording, a music video, a podcast episode, an interview, or a voice memo you filmed by accident. Converting MP4 to MP3 drops the video track and keeps just the audio, in a small file that plays on every phone, car stereo, and music app.

Choose the audio quality

  • High — around 245 kbps VBR, transparent quality for music.
  • Balanced — around 165 kbps VBR, the sweet spot for speech and general listening.
  • Small — around 100 kbps VBR, tiny files for spoken-word content.

Prefer a different audio format?

MP3 is the most compatible choice, but you can also extract to M4A (AAC), FLAC (lossless), or OGG (Vorbis) if you'd rather. Any of them keeps just the audio and discards the video.

Why bother extracting the audio at all

The video track is almost always the biggest part of the file by far — often ten to twenty times the size of the audio alone. If what you actually want is a lecture to listen to on a commute, a podcast episode, or a voice memo you filmed by accident, keeping the video around just wastes space and makes the file awkward to share. An MP3 of the same recording is small enough to email, message, or drop into any music app without a second thought.

One thing worth knowing about quality

An MP4's audio track is usually already compressed with a codec called AAC — so converting it to MP3 is technically a re-encode of already-compressed audio, not a lossless copy (the video-side equivalent of this trade-off is explained in our plain-English codec guide). In practice this is a non-issue at the High preset: AAC and MP3 are both efficient codecs, and a single re-encode between them is not something most people can hear. It only stacks up if you re-export the same file many times over, which extracting audio once never does.

Fast, because nothing uploads

The conversion runs locally in your browser, using a WebAssembly build of ffmpeg — code we provide, work your own device does. Your MP4 is read straight from your device and never uploaded, so there's no size limit and no upload wait — and nothing you convert is ever seen by anyone else. 100% private, as it should be.

Frequently asked questions

How do I convert an MP4 to MP3?
Open the converter, choose your MP4 file, set the output to Audio → MP3, and convert. The video track is dropped and you're left with just the audio — the whole thing runs in your browser, with nothing uploaded, so it starts the moment you pick the file.
Does converting MP4 to MP3 lose quality?
Extracting audio doesn't add any loss beyond the MP3 encoding itself. At the High setting (about 245 kbps) music is effectively transparent, and Balanced is plenty for speech. The result can never sound better than the original MP4's soundtrack, but it won't sound noticeably worse either.
Is there a file size limit?
No. Because nothing is uploaded, the only real limit is your device's own memory. A two-hour lecture recording or a multi-gigabyte MP4 converts the same way as a short clip — there's no server-imposed cap to worry about, and no queue to wait in either.
Can I convert MP4 to other audio formats?
Yes. Besides MP3 you can extract to M4A (AAC, the Apple-native choice), FLAC (lossless, good for archiving), or OGG (Vorbis, an open alternative to MP3). All of them drop the video track and keep just the sound, at the quality preset you choose.
Is it private?
Completely. The conversion happens locally in your browser using WebAssembly ffmpeg — your MP4 is never uploaded, stored, or seen by anyone, including us. That also makes it a safe option for videos you'd never want to put on someone else's server.

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