MP4 to MP3 converter
Turn MP4 files into MP3 in seconds, inside this tab. Only the audio track is kept. Nothing is uploaded.
- Runs on your device
- No upload
- No sign-up
- Free
Drop MP4 files here (any other format works too)
Stays on this device: nothing is uploaded. You can also drag a file here or paste it.
MP3: sharing, podcasts, car stereos, anything that must just play.
How to convert MP4 to MP3
- Choose your .mp4 files or drop them on the box above. You can add several.
- MP3 is already selected. Leave the bitrate at 192 kbps or change it.
- Conversion starts straight away. Press Download next to each finished file, or Download all.
MP4 vs MP3
| MP4 | MP3 | |
|---|---|---|
| Full name | MPEG-4 Part 14 video | MPEG-1 Audio Layer III |
| Type | Video container | lossy |
| Codec | usually H.264 video + AAC audio | MP3 (LAME encoder) |
| Size | depends on the video; the audio track itself is ~1 MB/min | 0.96 MB at 128 kbps, 2.4 MB at 320 kbps |
| Plays on | Everywhere | Everywhere: every phone, browser, car and media player made in the last 25 years |
MP4. MP4 is a container that holds a video track, an audio track (almost always AAC) and metadata. Phones, screen recorders and most downloads use it.
MP3. MP3 throws away sound the ear is unlikely to notice, using a psychoacoustic model, so a song shrinks to roughly a tenth of its CD size.
What happens to quality
Going from one lossy format to another re-encodes the audio, which costs a little quality each time. Pick a bitrate at or above the source’s to keep the loss inaudible. What bitrate really means.
Want the original audio with zero re-encoding? Extract the audio track losslessly instead.
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Questions people ask
How do I convert MP4 to MP3 without uploading?
Choose or drop your .mp4 file above. AudioKit converts it to MP3 inside your browser with ffmpeg.wasm and gives you a download. The file is never sent to a server, and you can convert several at once.
Will I lose quality converting MP4 to MP3?
Going from one lossy format to another re-encodes the audio, which costs a little quality each time. Pick a bitrate at or above the source’s to keep the loss inaudible.
What bitrate should I choose for MP3?
192 kbps is a good default. Going above the source file’s bitrate doesn’t improve sound, it only makes the file larger. For voice recordings, 96–128 kbps is plenty.
Can I convert a MP4 longer than an hour?
Yes. The video is read in place rather than copied into memory, and only its audio track is decoded. A one-hour MP4 usually converts in a few minutes on a laptop; phones are slower but work.
Is this MP4 to MP3 converter safe?
It’s about as private as a converter can be: nothing is uploaded, there is no account and no installer. The page needs a modern browser with WebAssembly (any current Chrome, Edge, Firefox or Safari).