How to Extract Audio from MP4 Video (Convert MP4 to MP3 Free)
Extract the audio track from any MP4 video and save it as an MP3 file. Works in your browser, free, no software needed.
Why Extract Audio from a Video?
There are many practical reasons to pull the audio from an MP4 file:
- Save a podcast, interview, or lecture as an MP3 to listen offline
- Extract the soundtrack from a music video
- Pull a voice recording from a video call
- Create an audio-only version of a tutorial for commuting
- Reduce file size — an MP3 is typically 10x smaller than the equivalent MP4
How to Convert MP4 to MP3 on Breklo
1. Go to Breklo's MP4 to MP3 converter
2. Upload your MP4 file (or drop it onto the page)
3. Choose your output bitrate (128kbps is standard, 320kbps is best quality)
4. Click Convert to MP3
5. Your MP3 file downloads in seconds
The tool also works with MOV, WebM and other video formats — not just MP4.
Choosing the Right Bitrate
Bitrate controls the quality and file size of the output MP3:
| Bitrate | Quality | Best for |
|---|---|---|
| 96 kbps | Acceptable | Voice recordings, podcasts |
| 128 kbps | Good | General use, music |
| 192 kbps | Very good | Music, high-quality audio |
| 320 kbps | Excellent | Archiving, professional use |
For most purposes, 128kbps is the standard choice. If the source video has high-quality audio (like a music video), use 192 or 320kbps.
MP3 vs WAV: Which Should You Use?
After extracting audio, you'll have an MP3 file. If you need to edit the audio in software like Audacity or Adobe Audition, consider converting to WAV format — WAV is uncompressed and gives editing software more to work with.
For just listening or sharing, MP3 is the better choice due to its small file size.
What About Long Videos?
The browser-based converter works well for videos up to around 500 MB. For very large files (full movies, long recordings), it may take a minute or two to decode. The progress indicator will keep you updated.
Other Ways to Use Your MP3
Once you have your MP3 file, you can:
- Convert WAV files to MP3 to compress existing audio
- Convert MP3 back to WAV for editing
- Upload to podcast platforms, music services or cloud storage
Try these free tools
Frequently asked questions
Does MP4 to MP3 conversion work on any video file?
It works on any video format your browser can decode, which includes MP4, MOV, WebM, MKV and AVI in most modern browsers.
How long does MP4 to MP3 conversion take?
It depends on the file size and your device. A typical 100 MB MP4 takes 10–30 seconds. The browser decodes the audio track and re-encodes it as MP3 locally.
Will the audio quality be the same as the original?
The output quality is limited by the source audio. If the original MP4 had high-quality audio, choosing 192kbps or 320kbps will preserve it well.
Can I extract audio from a YouTube video?
Breklo only works with files you upload from your device. For YouTube audio, you would need to download the video first.
What bitrate should I use for music?
192kbps or 320kbps is recommended for music. 128kbps is fine for voice recordings and podcasts.
Is there a file size limit for MP4 to MP3 conversion?
Breklo supports files up to 100 MB. For larger files, processing may be slower depending on your device.