MP4 to MP3 Converter
Extract MP3 audio from MP4 videos at up to 320 kbps. Private — videos are processed on your device.
How to convert MP4 to MP3
- 1
Choose your MP4 files
Click the upload area or drag files onto it. Nothing is uploaded — files are opened locally.
- 2
Adjust the settings
Pick audio quality, then press the convert button.
- 3
Download the result
Save each file individually or everything at once as a ZIP.
Save the audio track of a lecture, interview, podcast recording or music video as an MP3 you can play anywhere.
This keeps the sound and drops the picture, which is handy for lectures, interviews and recordings you want to listen to on the move. The MP3 keeps the title of the original file, and the video itself is left untouched on your device.
Pick a higher bitrate for music and a lower one for speech. For a talk or a meeting, a lower bitrate sounds fine and gives a much smaller file. Choosing a bitrate above the source audio makes the file bigger without making it sound better.
Read the full guide with screenshotsWhat is MP4?
MP4 is the most widely supported video format, used by phones, cameras, YouTube and every social platform.
What is MP3?
MP3 is the universal compressed audio format. It plays on every device, car stereo and music app with small file sizes.
Is it private?
Yes. Unlike upload-based converters, ZapMorph processes files inside your browser tab, so the file stays on your device. It is never transmitted, stored or logged — close the tab and it’s gone.
Frequently asked questions
Is the mp4 to mp3 converter free?
Yes, once a day. Convert one file up to 25 MB a day without an account. A free account gets one run a day on any Pro tool with files up to 50 MB; Pro and Lifetime plans are unlimited.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser, so your files never leave your device. We only count how many files you convert — never their names or contents.
What is the maximum file size?
Up to 25 MB per file without an account, 50 MB with a free account, and 1 GB on Pro. Very large files also depend on your device’s memory.
Can I convert multiple MP4 files at once?
Yes. Select several MP4 files at once — up to 5 on the free plan or 50 on Pro — and download all results in a single ZIP.
Does it work on Mac, Windows, iPhone and Android?
Yes. It works in any modern browser — Chrome, Edge, Firefox and Safari — on desktop and mobile, with nothing to install.
Which MP3 bitrate should I choose?
Use a higher bitrate such as 320 kbps for music and a lower one for speech. A bitrate above the original audio only makes the file bigger.
Related converters
WAV to MP3
WAVMP3
Compress WAV audio to MP3 and cut file size by up to 90%. Choose bitrate up to 320 kbps.
M4A to MP3
M4AMP3
Convert M4A audio from iPhone Voice Memos and iTunes to MP3. Private, in-browser conversion.
FLAC to MP3
FLACMP3
Convert lossless FLAC music to MP3 at up to 320 kbps. Play it on any device. Private, in-browser conversion.
OGG to MP3
OGGMP3
Convert OGG Vorbis and Opus audio — including voice notes — to MP3. Private, no uploads.
Audio
AudioMP3
Convert any audio file — WMA, AIFF, AAC, OPUS, FLAC and more — to MP3, M4A, WAV, OGG or FLAC.
MP4 to WebM
MP4WebM
Convert MP4 videos to open WebM (VP8 + Vorbis) for websites and HTML5 players. Private.