Convert MP3 to AAC — Free & Private
Convert MP3 to AAC online for free. MP3 is the most widely-supported lossy audio format; AAC is a high-efficiency audio format used by Apple and YouTube. All processing happens locally in your browser — your files never leave your device.
How to convert MP3 to AAC
- 1
Select your MP3 file
Click or drag your MP3 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.
MP3 to AAC — FAQ
Is the MP3 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 MP3 files safe?
Absolutely. Your files never leave your browser. All MP3 to AAC conversion happens using WebAssembly running locally on your device — no uploads, ever.
How long does MP3 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 MP3 and AAC?
MP3 is the most widely-supported lossy audio format. AAC is a high-efficiency audio format used by Apple and YouTube.