How to use the MP4 to MP3
- Add your MP4 file
- Choose the MP3 bitrate
- Download the MP3
About this tool
Convert MP4 videos to MP3 audio online. Free, fast and private — your video is processed on your device. MP4 to MP3 is part of ToolNest's collection of free video & audio. All processing happens locally in your browser, so your files stay private and nothing is uploaded.
Frequently asked questions
Is the MP4 to MP3 free to use?
Yes. MP4 to MP3 on ToolNest is completely free, with no sign-up, no watermark and no daily limits.
Are my files uploaded to a server?
No. MP4 to MP3 processes your files directly in your web browser on your own device. Your files are never uploaded, stored or seen by anyone, which makes it safe for private and confidential documents.
Is there a file size limit?
There is no fixed limit, but very large files depend on your device's memory and speed. Files up to a few hundred MB usually work well on a modern computer.
Does MP4 to MP3 work on mobile phones?
Yes. ToolNest works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux. There is nothing to install.