MP4 to MP3 Converter: Convert MP4 to MP3 Free

MP4 vs. MP3: what is the difference?

MP4 is a container: one file that holds video, audio and sometimes subtitles. Almost every phone, camera, screen recorder and editing app saves video as MP4. MP3 holds audio only and is the most compatible audio format ever made: it plays in every music app, car stereo, smart speaker, podcast editor and old MP3 player.

Converting MP4 to MP3 keeps the sound, throws away the picture, and gives you a file that is usually 90 percent smaller than the video. A 10-minute 1080p video might be 200 MB; the same sound as a 192 kbps MP3 is about 14 MB.

How to convert MP4 to MP3

This converter decodes the audio of your MP4 with your browser's own media engine and encodes it to MP3 with LAME, the classic open-source MP3 encoder. Nothing is uploaded, so even a long recording converts without waiting for an upload, and private recordings stay on your device.

1. Add your MP4 files. Drag them in or tap to choose. MOV videos from an iPhone, M4V and WebM files work too.
2. Choose the bitrate. 192 kbps is the best all-round setting.
3. Trim (optional). Type a start time like 1:05 and an end time like 1:35 to keep just that part.
4. Convert and download. Save each MP3, or download all of them as a ZIP.

Which MP3 bitrate should I choose?

Most phone videos record sound as AAC at about 128 to 256 kbps. Converting that to a 320 kbps MP3 does not make it sound better than the original; it only makes a bigger file. 192 kbps is the sensible default, and 128 kbps is plenty for speech.

Converting MP4 to MP3 on iPhone and Android

You do not need an app. Open this page in Safari or Chrome on your phone, tap the box, and choose a video from Photos or Files. When the MP3 is ready, tap Download; on iPhone it is saved to the Files app (usually in Downloads), on Android to the Downloads folder. Phones handle short and medium videos well; for very long recordings, a computer is faster.

Making a ringtone from a video

Want the sound from a video as a ringtone? Use the start and end boxes to cut a clip of 30 seconds or less.

• Android: copy the MP3 to your phone, then choose it under Settings, Sound, Phone ringtone (menu names vary by brand).
• iPhone: iOS ringtones use the M4R format and must be 40 seconds or shorter. A common free route is to import your MP3 into Apple's GarageBand app on the iPhone and export it as a ringtone from there.

MP4 to MP3 or the full video to audio converter?

This page is focused on the most common job: MP4 in, MP3 out. If you need other formats, such as M4A that copies the original sound with no quality loss, uncompressed WAV for editing or transcription, or OGG, use our video to audio converter. It uses the same engine with more output choices.

Common problems

• "This video has no sound track": screen recordings without a microphone and some silent clips simply have no audio to extract.
• The MP3 is quiet: the converter keeps the original volume. Normalize it in a free audio editor if needed.
• Times are not accepted: write seconds (75), minutes and seconds (1:15) or hours, minutes and seconds (1:01:15).

Only convert what you have the right to use

Converting your own videos, lectures you recorded, or files you have permission to use is fine. Downloading and converting copyrighted music or videos from streaming sites may violate copyright law and the sites' terms. Making content of your own? See our guide to starting a faceless YouTube channel, our list of video editing apps for beginners, and shrink big video files with the video compressor.

Last updated November 3, 2026.