How to convert MP3 to AAC
To convert MP3 to AAC, upload your MP3 file, choose AAC as the output format and press Convert. The finished AAC file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns MP3 audio files into AAC in your browser, with no software to install and no watermark. The conversion runs on our server using ffmpeg, and the result is ready to save to your phone or computer in seconds. Your MP3 file is deleted automatically about 30 minutes after the conversion.
Reasons to switch from MP3 to AAC
- Better quality than MP3 at the same size
- The default audio of YouTube and Apple
- Efficient at low bitrates
- Opens in: iPhone, Android, Windows, macOS, VLC and most hardware players
What to expect from this conversion
- Both formats are lossy, so converting costs a little extra quality. If you still have the original, convert from that.
- AAC output is a raw ADTS stream without a container, which plays in most players but stores no cover art. Choose M4A if you need tags.
- Tags such as title and artist are carried over where AAC supports them.
MP3 vs AAC
| Property | MP3 | AAC |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | Advanced Audio Coding (ADTS stream) |
| Released | 1993, Fraunhofer and MPEG | 1997, MPEG (Fraunhofer, Dolby, Sony and others) |
| Family | Audio | Audio |
| Compression | Lossy | Lossy |
| Opens in | every phone, computer, car stereo, smart speaker and web browser | iPhone, Android, Windows, macOS, VLC and most hardware players |
| Best for | music libraries and downloads; podcasts | streaming and broadcast; radio and live audio |
Steps to convert MP3 to AAC
- Drop your MP3 file onto the converter, or click to choose it.
- Check that AAC is selected as the target format and adjust the options if you want.
- Press Convert, then save the new AAC file to your device when it finishes.
Tips for the best result
- Choose High for music you care about and Small for voice recordings.
- Convert from the original lossless file when you have one.
Frequently asked questions
How do I convert MP3 to AAC?
Drop your MP3 file on the converter, confirm that AAC is the target format and press Convert. When it finishes, press Save to device or download the AAC file. No account or software is needed.
Is the MP3 to AAC converter free?
Yes. It is free, with no watermark, no sign-up and no limit on how many files you convert. The site is supported by ads.
What should I know before converting MP3 to AAC?
Both formats are lossy, so converting costs a little extra quality. If you still have the original, convert from that. AAC output is a raw ADTS stream without a container, which plays in most players but stores no cover art. Choose M4A if you need tags.
Will the sound quality change when converting MP3 to AAC?
Both formats are lossy, so converting costs a little extra quality. If you still have the original, convert from that.
Which programs open AAC files?
AAC files open in iPhone, Android, Windows, macOS, VLC and most hardware players.
How large a file can I convert?
Up to 200 MB per file. Files are deleted from the server about 30 minutes after conversion, and no one looks at them.