What you can do with the audio
- save the soundtrack of a video you recorded, such as a concert, speech or class
- turn a recorded lecture, webinar or meeting into audio to listen to on the go
- get the audio from a screen recording to transcribe it
- use the sound from your own clip in another project
How to use it
- Choose the MP3 quality: 192 kbps for music, 128 kbps is enough for speech.
- Choose your MP4 videos or drop them on the box above.
- Download the MP3. The note shows its length and bitrate.
The video itself isn’t changed or uploaded: only the sound is read, on your device.
Which videos work
Nearly all MP4 files from phones, cameras, screen recorders and editing apps store their sound as AAC, which every modern browser can decode. Files ending in .m4v, the variant Apple uses for some videos, work the same way, provided they aren’t copy-protected.
Videos from other containers have their own converters: use MOV to MP3 for iPhone and Mac recordings saved as .mov.
Sound quality
| Bitrate | Use |
|---|---|
| 128 kbps | Speech: lectures, meetings, interviews |
| 192 kbps | Music and general use (default) |
| 320 kbps | The highest MP3 quality, for music you care about |
Choosing a bitrate higher than the video’s own audio doesn’t improve the sound, but it does avoid adding further loss.
Large files and phones
The whole video is read into memory before the audio is decoded. On a computer, files up to about 1 GB are fine. On phones, a 10-minute video is usually fine; hour-long recordings may fail for lack of memory. If that happens, use a computer.
Need uncompressed audio?
For editing or transcription tools that need WAV, use MP4 to WAV instead, which saves the audio without MP3 compression.
Questions
How big a video can I convert?
Videos up to about 1 GB work on a computer. Phones have less memory, so for long videos a computer is more reliable.
Is the audio quality the same as in the video?
The audio is decoded from the video and encoded as MP3, so it's compressed a second time. At 192 kbps or higher it sounds the same to almost everyone.
Why do I get "no audio could be read"?
The video has no sound track, or its audio uses a format your browser can't decode. Most phone and camera MP4s use AAC audio, which works everywhere.
Can I convert YouTube or streaming videos?
This tool converts video files you already have on your device. It doesn't download from websites, and you should only convert content you have the right to use.
Last reviewed 31 October 2026