Convert MP4 to MP3 — Free & Private
Extract MP3 audio from MP4 video files directly in your browser. No uploads, no accounts, completely free.
How to convert MP4 to MP3
- 1
Select your MP4 file
Click or drag your MP4 file onto the converter above.
- 2
Convert to MP3
The output format is pre-set to MP3. Click the convert button to process your file.
- 3
Save instantly
Your converted MP3 file is ready — save it to your device, no email required.
MP4 to MP3 — FAQ
Is the MP4 to MP3 converter really free?
Yes, completely free. No hidden fees, no watermarks, no file size limits. LocalConvert is open source and free forever.
Are my MP4 files safe?
Absolutely. Your files never leave your browser. All MP4 to MP3 conversion happens using WebAssembly running locally on your device — no uploads, ever.
How long does MP4 to MP3 conversion take?
Most conversions finish in seconds. Larger files may take a little longer depending on your device's speed and memory.
What's the difference between MP4 and MP3?
MP4 is the most universally compatible video format. MP3 is the most widely-supported lossy audio format.