Convert MP3 to AAC
MP3 is great for sharing music, podcasts and ringtones that play on every device, but AAC is the better choice for efficient music files and broadcast audio. Convert MP3 to AAC in seconds, right in your browser.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert MP3 to AAC
- 1
Tap Choose files and select one or more MP3 files (or drag them in).
- 2
Check that AAC is selected. Use Advanced options for bitrate, channels or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your AAC downloads automatically. Converting several files? Grab them all as a ZIP.
MP3 vs AAC
Both formats are lossy, so the audio is re-encoded once. Pick High quality to keep it as close to the original as possible, or Small for the smallest file.
| MP3 | AAC | |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | Advanced Audio Coding (raw ADTS) |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Developed by | Fraunhofer IIS | MPEG |
| Introduced | 1993 | 1997 |
| Plays on iPhone | ✓ Yes | ✓ Yes |
| Plays on Android | ✓ Yes | ✓ Yes |
| Plays on Windows | ✓ Yes | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About MP3 and AAC
MP3: MP3 is the most widely supported audio format in the world. It uses lossy compression to make music and voice files small enough to share, while keeping quality good enough for everyday listening.
AAC: AAC is the successor to MP3 and the audio codec behind YouTube, iTunes and most streaming services. A .aac file stores the raw AAC stream without an MP4 wrapper.
Frequently asked questions
How do I convert MP3 to AAC on my phone?
Will converting MP3 to AAC reduce quality?
Is this MP3 to AAC converter free?
Are my files uploaded to a server?
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