Convert MP4 to AAC — Free & Private
Extract AAC audio from MP4 video files directly in your browser. No uploads, no accounts, completely free.
How to convert MP4 to AAC
- 1
Select your MP4 file
Click or drag your MP4 file onto the converter above.
- 2
Convert to AAC
The output format is pre-set to AAC. Click the convert button to process your file.
- 3
Save instantly
Your converted AAC file is ready — save it to your device, no email required.
MP4 to AAC — FAQ
Is the MP4 to AAC 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 AAC conversion happens using WebAssembly running locally on your device — no uploads, ever.
How long does MP4 to AAC 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 AAC?
MP4 is the most universally compatible video format. AAC is a high-efficiency audio format used by Apple and YouTube.