MP4 to MP3
Free online tool to extract MP3 audio from MP4 videos. Supports MP4, MKV, WebM, and MOV. Browser-based — files never leave your device.
Privacy Protection
All processing is done locally in your browser. MP4 video files are never uploaded to any server, keeping your data fully private.
Fast Extraction
Powered by WebCodecs and hardware acceleration, audio is extracted from MP4 instantly — no upload needed.
Adjustable Quality
Four bitrate options from 64kbps to 320kbps — balance quality and file size to suit your needs.
Drag and drop video files here
or
Supports MP4, MKV, WebM, MOV
3 Steps to Convert MP4 to MP3
Upload Your MP4 File
Click or drag an MP4, MKV, WebM, or MOV file into the upload area. Up to 2 GB supported.
Select the MP3 bitrate
Default is 256kbps high quality. Adjust from 64kbps to 320kbps as needed.
Extract & Download
Click Extract, then download your MP3. Everything runs in the browser — no account required.
Common Use Cases for MP4 to MP3
Extract Background Music from Videos
Extract the background music from your favourite MV, concert clip, or movie scene and save it as an MP3 for offline listening. Choose 256 or 320 kbps to preserve the original quality.
Screen Recordings & Lecture Videos
Convert lecture recordings, meeting videos, or online-course MP4 files to MP3 so you can listen on the go with earphones. 128 kbps is plenty for speech content and keeps file sizes small.
Podcast & Audio Content Production
Convert MP4 interview or talk-show recordings to MP3 before uploading to podcast platforms such as Spotify. MP3 is the standard format and makes files smaller and faster to download for listeners.
Save Storage & Data
When you only need the audio, the video track in an MP4 wastes storage and bandwidth. Converting to MP3 typically shrinks the file by over 90%, letting you store far more tracks on your phone or USB drive.
MP4 Video vs MP3 Audio: Key Differences
| Comparison | MP4 (Video file) | MP3 (Audio only) |
|---|---|---|
| Content | Contains video, audio track, subtitles, and more | Audio data only, no video |
| File Size | Large — typically tens of MB to several GB | Small — about 1–3 MB/min (128–320 kbps) |
| Playback | Requires a device or app with video playback support | Natively supported on virtually every device, including legacy MP3 players |
| Use Cases | Best when you need to watch visuals: video lessons, movies | Audio-only scenarios: commuting, music playback, podcasts |
| Power usage | Video decoding draws more power | Audio-only playback is extremely efficient — better battery life |
Supported input formats
- MP4 — the most common video format, used for screen recordings, camera footage, and downloads
- MKV — popular container for HD movies, supports multiple codecs
- WebM — the standard web video format, commonly downloaded from YouTube
- MOV — Apple QuickTime format, the default for iPhone videos
Technical Notes
VideoKit MP4 to MP3 uses the WebCodecs API to decode the audio track from MP4/MKV/WebM/MOV files directly in your browser and encode it as MP3. Nothing leaves your device.
MP3 encoding uses the LAME algorithm for the best quality-to-size ratio at popular bitrates. Choose from 64 to 320 kbps to suit anything from voice recordings to high-quality music.
Frequently Asked Questions
How do I extract MP3 audio from an MP4 video?
Upload your MP4, choose a bitrate, click Extract MP3 Audio, then download. No software needed, no files uploaded.
Will converting MP4 to MP3 reduce audio quality?
MP3 is lossy and some quality is lost. At 256 or 320 kbps the difference is barely audible in everyday listening.
Which video formats are supported as input?
Supports MP4, MKV, WebM, and MOV — extract MP3 audio from virtually any video source.
Will my files be uploaded to a server?
No. All processing is done locally in your browser. Your video never leaves your device.
Which MP3 bitrate should I choose?
Music: 256 or 320 kbps. Podcasts or lectures: 128 kbps. Voice memos: 64 kbps.
What's the Maximum MP4 File Size Supported?
Files up to 2 GB are supported. For large files, a computer with ample memory is recommended. Processing time scales with video length.
Will the extracted MP3 sound different from the video audio track?
The AAC audio in an MP4 is decoded and re-encoded to MP3, which causes a small quality loss. Choosing a bitrate close to the original preserves audio quality as much as possible.
Where can I use the converted MP3?
MP3 is the most universal audio format — iPhone, Android, Windows, Mac, car stereos, Bluetooth speakers, WeChat, and music platforms all support it natively.