How to Convert MP3 to AAC
- Click the drop zone above or drag and drop your MP3 file(s) into it.
- Make sure AAC is selected as the output format.
- Choose your preferred sample rate (44.1 kHz recommended for most uses).
- Click "Convert All" and wait for the conversion to complete.
- Download your converted AAC file(s) individually.
What is MP3?
MPEG Audio Layer III (MP3) — A widely-used lossy audio format that offers good compression while maintaining reasonable audio quality. Ideal for music streaming and portable devices.
- Format type: Lossy
- File extension: .mp3
What is AAC?
Advanced Audio Coding (AAC) — A lossy audio format that delivers better sound quality than MP3 at the same bitrate. The default format for Apple devices and YouTube.
- Format type: Lossy
- File extension: .aac
Why Convert MP3 to AAC?
Converting from MP3 to AAC can offer better compression efficiency, wider device compatibility, or a format better suited to your specific use case. Both are popular audio formats with broad software and hardware support.
MP3 vs AAC — Key Differences
| Feature | MP3 | AAC |
|---|---|---|
| Full name | MPEG Audio Layer III | Advanced Audio Coding |
| Compression | Lossy | Lossy |
| File extension | .mp3 | .aac |
Frequently Asked Questions
Is this converter free?
Yes, completely free. There are no limits on the number of conversions, no file size restrictions, and no account required.
Is my audio data safe?
Absolutely. Your files never leave your device. All conversion happens locally in your browser using the Web Audio API — no data is uploaded to any server.
What browsers are supported?
This converter works in all modern browsers including Chrome, Firefox, Safari, and Edge. Some output formats (OGG, WebM, AAC) depend on your browser's MediaRecorder support.
Can I convert multiple files at once?
Yes. You can drop or select multiple MP3 files and they will all be converted to AAC in sequence.