How to convert MP4 to MP3
- 1
Drop your MP4 file into the converter above, or click to browse. Nothing is uploaded — the file stays on your device.
- 2
Adjust the settings (bitrate and the trim window). Tip: Use 192 kbps for speech (lectures, meetings) and 256–320 kbps for music. Trim first — extracting just the segment you need is faster and gives a smaller file.
- 3
Click “Convert to MP3”. The conversion runs locally in your browser — larger files take longer, and a progress bar keeps you posted.
- 4
Preview the result and hit Download to save your MP3 file.
Why convert MP4 to MP3?
Sometimes you only need the sound: a lecture to listen to on a commute, a recorded meeting for transcription, a music performance, a podcast published as video. Extracting the audio as MP3 gives you a small file that plays on absolutely everything.
Because this runs locally, it's suited to private recordings too — meetings, interviews, and voice memos are never uploaded to anyone's server. The trim controls let you extract exactly the segment you need instead of the whole recording.
MP4 vs MP3 at a glance
| MP4 | MP3 | |
|---|---|---|
| Type | Video container (H.264 + AAC) | Audio |
| Compression | Lossy, very efficient | Lossy (96–320 kbps) |
| Audio | Yes (AAC) | — |
| Compatibility | Universal — every device, browser, and editor | Universal |
| Best for | Sharing, social media, editing, playback anywhere | Music, podcasts, sharing audio anywhere |
About the formats
MP4 MPEG-4 Part 14
MP4 is the most widely supported video format in the world. Built on the H.264 codec with AAC audio, it plays on every phone, browser, TV, and editing app, and offers an excellent balance of quality and file size. When in doubt, MP4 is the safe choice for sharing video.
MP3 MPEG-1 Audio Layer III
MP3 is the most compatible audio format ever made. Its lossy compression keeps music and speech small enough to store and share easily, and literally every player, phone, car stereo, and app supports it.
Frequently asked questions
What bitrate should I choose?
192 kbps is transparent for speech and podcasts; 256–320 kbps is the right range for music. Higher bitrates can't add quality the video's audio track didn't have, so 320 is only worth it for high-quality sources.
Can I extract just part of the audio?
Yes — set start and end times in the trim fields to export only that segment. It's ideal for pulling one song from a concert recording or one answer from a long interview.
Is this MP4 to MP3 converter really free?
Yes — completely free, with no watermarks, no sign-up, and no conversion limits. The tool is supported by ads on this page, so the converter itself never asks you for anything.
Are my files uploaded to a server?
No. This converter runs entirely in your browser using WebAssembly (a browser build of FFmpeg). Your MP4 file never leaves your device — nothing is uploaded, stored, or seen by us, which also makes it safe for private or confidential files.
Is there a file size limit?
There's no hard limit. Because conversion happens on your own device, the practical ceiling is your browser's memory — files up to a few hundred megabytes work well on most computers. Very large files may be slow or fail on low-memory devices.
Why does the first conversion take a moment to start?
The first time you convert, your browser downloads the conversion engine (about 31 MB) once. It's cached after that, so later conversions start instantly — and they keep working even offline.
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