MP4 to MP3
Extract MP3 audio from an MP4 file in your browser using FFmpeg WebAssembly.
✓ No signup✓ Mobile friendly✓ Clear limitations✓ Browser-first where practical
Recent tools are remembered only on this device.
Local media conversion. Use files you own or have permission to convert. FFmpeg WebAssembly is downloaded on first use and may take time on mobile.
Why use this mp4 to mp3?
MP4 to MP3 extracts an MP3 audio track from a local MP4 using FFmpeg WebAssembly.
Example
Convert a video recording you own into an audio-only file.
Important note
Use only media you own or are authorized to convert. Large files can be demanding on mobile devices.
How to use it
Start with the inputs shown above, review any options or assumptions, then generate the result. Where the tool creates a file, keep the original until you have opened and checked the downloaded output.
Frequently asked questions
Is this tool free?
Yes. The core tool is free to use.
Do I need an account?
No. You can use it without signing up.
Does it work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers.