Convert MP4 to MP3
Convert MP4 to MP3 free in your browser. No upload, no signup, no watermark. Files stay on your device.
drop a .mp4 file
or click to browse
max 500 MBrelated
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how to convert mp4 to mp3
Drop your MP4 file
Drag your MP4 file into the drop zone above, or click the box to pick a file from your computer or phone. The browser reads the file directly — nothing uploads.
Click Convert
The page runs ffmpeg.wasm on your device to decode the MPEG-4 Part 14 and encode it as MPEG-1 Audio Layer III. Most conversions finish in a few seconds; large or codec-heavy files (RAW, video) can take longer.
Download the MP3 file
When the conversion finishes, the MP3 file is ready to download. Save it anywhere on your device.
FAQ
common questions
What happens to the video — is it just discarded?
Yes. MP4 is a container that holds both video and audio tracks; MP3 is audio-only. The converter decodes the audio track from your MP4 and re-encodes it as MP3, dropping the picture entirely. If your MP4 has multiple audio tracks (different languages, commentary), the converter picks the first one.
What bitrate does the MP3 use?
192 kbps by default — a solid middle ground that sounds clean for music and speech without inflating file size. Lower bitrates (128 kbps) work fine for talk content; higher (256, 320) are useful for music with complex production. Re-encoding from a lower-bitrate source at a higher target rate doesn't restore detail; it only inflates the file.
Will the audio quality match the original?
Close, with a small quality cost. The audio track inside MP4 is usually AAC (a lossy codec). Converting to MP3 is decode-AAC-then-re-encode-MP3, which adds a second lossy generation. The difference is generally inaudible on typical playback; audiophiles or critical listeners can hear it on revealing equipment.
How long does the conversion take?
Roughly real-time or faster — a 5-minute MP4 typically converts in 30–60 seconds in the browser. The audio decode and MP3 encode are computationally cheap compared to video; most of the time goes into demuxing the MP4 container and writing the MP3.
Will tags like artist / title / album come through?
Sometimes. If your MP4 was created from a music source that embedded ID3-like metadata, the converter copies what it can to MP3 ID3 tags. MP4s ripped from YouTube or video sites usually have no music metadata — the MP3 comes out untagged. You can edit tags afterward in any music app or tag editor.