How to extract audio from a video
- Choose the video. Drop an MP4, MOV, MKV or WebM file onto the box, or tap to pick one from your phone's library. Audio files work too, so you can also convert M4A to MP3 or WAV to MP3.
- Pick a format. MP3 is the safe default. The details panel shows which codec the file's audio already uses.
- Trim if you only need part of it. Play the preview, then use "Use current time" to set the start and end.
- Press Extract audio, listen to the result, and download it. The file name matches your video, so holiday.mp4 becomes holiday.mp3.
Which audio format should I choose?
| Format | Best for | Size per minute |
|---|---|---|
| MP3, 192 kbps | Music players, car stereos, old devices, sharing | about 1.4 MB |
| M4A (AAC), 160 kbps | iPhone, iTunes and Apple Music, ringtones, podcasts | about 1.2 MB |
| WAV, 16-bit | Audio editors (Audacity, GarageBand, DAWs), transcription, archiving | about 10 MB at 44.1 kHz stereo |
| Opus, 96 kbps | Smallest files with excellent quality; web and Android | about 0.7 MB |
Bitrate works the same way in every lossy format: higher sounds closer to the original and takes more space. For speech, 96 to 128 kbps MP3 or 64 kbps Opus is plenty, and choosing Mono halves the size again. For music, 192 kbps MP3 or 160 kbps AAC is hard to tell from the source.
Extract without re-encoding (lossless and instant)
Most phone and camera videos store their sound as AAC. If you choose M4A with Original (no re-encode), the tool copies the audio stream straight into a new file instead of decoding and re-compressing it. You get exactly the original quality, and even an hour-long video finishes in seconds. The same works for Opus audio in WebM files and MP3 audio in MP3 files. The tool shows a tip when this is possible for your file.
Converting to a different format always re-encodes. Re-encoding can't add quality that isn't there, so choosing 320 kbps MP3 for a video with 128 kbps audio only makes a bigger file. WAV is the exception: it stores the decoded sound without further loss, which is what editing software prefers.
Private by design
Your video is never uploaded. The audio is extracted by your browser using WebCodecs and a built-in MP3 encoder, so it works for private recordings, interviews and meetings, and it keeps working offline once the page has loaded. Location data from phone videos is not copied into the audio file; only descriptive tags such as title and artist are kept.
Troubleshooting
- "This video has no audio track": screen recordings and some exported clips are silent. Check the Audio row in the file details.
- M4A isn't available: some browsers, such as Chrome on Linux, can't encode AAC. Choose MP3 or Opus, or pick Original if the video's audio is already AAC.
- AC-3 or DTS audio can't be decoded: browsers don't include these surround-sound decoders, which are common in MKV movie files.
- Several audio tracks: films with multiple languages show an Audio track menu. Pick the one you want.
Next steps: find the tempo of the extracted track with the BPM finder, turn a melody into notes with audio to MIDI, or shrink the video itself with the video compressor.
Frequently asked questions
How do I convert an MP4 video to MP3?
Drop the MP4 onto the tool, leave the format on MP3 (192 kbps is a good default) and press Extract audio. The soundtrack is decoded and encoded to MP3 in your browser, and you can listen to it before downloading. The file keeps your video's name, so clip.mp4 becomes clip.mp3.
Can I extract audio without losing quality?
Yes. Most MP4 and MOV videos store their sound as AAC. Choose M4A and "Original (no re-encode)" and the audio stream is copied into the new file bit for bit, with no quality loss, in a few seconds. The tool tells you when this is possible. Converting to a different format such as MP3 always re-encodes.
Is my video uploaded to a server?
No. The file is read and converted entirely inside your browser, using WebCodecs and a built-in MP3 encoder. Nothing leaves your device, which makes it safe for private recordings, meetings and interviews.
Which format should I choose: MP3, M4A, WAV or Opus?
MP3 plays on everything. M4A (AAC) is the native format for iPhone and Apple Music and is slightly smaller for the same quality. WAV is uncompressed and best for audio editors and transcription, but about ten times larger. Opus gives the smallest files at excellent quality and plays in browsers and on Android.
Can I extract just part of the audio?
Yes. Enter a start and end time, such as 1:30 and 2:45, or play the preview and press "Use current time" at the right moments. Only that section is converted, and the times are added to the file name.
Does it work on iPhone and Android?
Yes. Open the page in Safari or Chrome, tap the box and choose a video from your library. The extracted MP3 or M4A is saved to your Downloads or Files app. Very long videos convert faster on a computer.
Why can't I choose M4A in my browser?
Creating M4A needs an AAC encoder, which some browsers, such as Chrome on Linux, don't include. If the video's audio is already AAC, pick "Original" to copy it into an M4A without encoding. Otherwise choose MP3 or Opus, or use Chrome or Edge on Windows or Mac, or Safari.