Convert any MP4 file to MP3 — free, private, entirely in your browser.
Click "Start Converting — Free" to launch the converter in your browser.
Drag and drop your MP4 file or click to browse. Choose MP3 as the output format.
Conversion runs locally via WebAssembly. Download your MP3 file instantly.
Files never leave your device. MP4→MP3 conversion is 100% client-side.
No registration, no watermarks, no usage limits — ever.
Uses open-source FFmpeg compiled to WebAssembly for native-speed conversion.
Works in Chrome, Firefox, Edge, and Safari on desktop and mobile.
Convert multiple files using the built-in queue without reloading the page.
Yes. AnyConvert uses open-source FFmpeg via WebAssembly — no cost, no sign-up, no limits.
No. All conversion happens in your browser using WebAssembly. Your files never leave your device.
There is no server-side limit. The practical limit depends on your device's available memory — most files under 500 MB work fine.
Yes. The MP3 audio track is extracted directly from the MP4 container without re-encoding, preserving the original quality.
This tool is optimized for MP4. For AVI, MOV, MKV, and other formats, use the general Audio Converter or Video Converter tool.
Open AnyConvert in your mobile browser, select your MP4 file, choose MP3 as output, and download. No app needed.