MP4 to MP3 Converter
Pull the audio track out of your MP4 videos and save it as MP3. MP3 is the most widely-supported audio format, small and playable everywhere. Everything runs on your own device — your videos are never uploaded — so this is the private way to get MP3 audio from a MP4 file you already have.
Drop audio or video files here or click to browse
Converted on your device. Nothing is uploaded. Large files run best on desktop.
How to convert MP4 to MP3
- Drop your MP4 file(s) into the box above, or click to browse.
- Choose MP3 as the output and pick a bitrate.
- Click “Convert to MP3”. The first run loads the converter engine once, then it's cached.
- Download your MP3 file — no watermark, no sign-up.
Frequently asked questions
Is this MP4 to MP3 converter free?
Yes — completely free, no account, no watermark. The only limit is your device's memory, since everything runs locally.
Are my files uploaded to a server?
No. Your MP4 file is processed entirely in your browser using WebAssembly. It never leaves your device.
Does this download videos from YouTube or other sites?
No. This tool only works with MP4 files you already have on your device. It does not download from any website.
Can I convert large files?
Yes, but very large media uses a lot of memory. For big files, a desktop browser works best.