Convert MP4 to MP3 Online
Need to convert MP4 to MP3 right now? Drop your file and get results in seconds. Everything runs in your browser. Your audio never leaves your device.
Drop your MP4 file here or click to browse
MP4 (.mp4) · Max 20 MB
AudioUtils converts MP4 to MP3 using WebAssembly. The entire process happens locally. No upload, no server, no waiting in a queue.
Open any browser. Pick your file. Click convert. The MP3 file downloads instantly. Works on any device with a modern browser.
Both MP4 and MP3 are lossy formats. Each re-encode can degrade quality slightly. Convert once and keep the result. Free tier handles input files up to 20MB with a 10-second preview output. Upgrade to Pro for unlimited, full-length conversions up to 500MB.
Frequently Asked Questions
Will I lose audio quality converting MP4 to MP3?
Most MP4 files already use AAC audio compression. Converting to MP3 involves re-encoding, which can introduce minimal quality loss. At 320kbps, the difference is negligible for most listeners.
Can I extract audio from YouTube downloads?
If you have a locally saved MP4 file, yes. This tool processes files on your device — it doesn't download from URLs.
What happens to the video data?
The video track is discarded entirely. Only the audio is extracted and converted to MP3. Your file size drops dramatically.
About MP4
The most common video container format. Used by YouTube, smartphones, and cameras. Extract audio from any MP4 file instantly.
About MP3
The most widely used audio format. Great compatibility, small file size. Ideal for music, podcasts, and general use.