MP3 to AAC Converter
Drop in MP3 files and get AAC back in seconds, processed entirely on your device.
MP3 files (most other audio and video files work too). Files stay on your device.
How it works
- Choose your MP3 file, or drop it on the page. You can add several files at once.
- Choose AAC quality: a bitrate (96 to 256 kbps; 128 to 192 kbps is typical) or leave the default.
- Click Convert. Processing happens on your device and shows progress; you can cancel at any time.
- Preview the result and download the AAC file. With several files, download them all as one ZIP.
About MP3 to AAC conversion
MP3 (MPEG-1/2 Audio Layer III) suits music libraries, podcasts and sharing when you cannot know what the listener uses. AAC (Advanced Audio Coding, raw ADTS stream) suits streaming-style files and hardware that expects a plain AAC stream.
Both formats are lossy, so converting re-encodes the audio and costs a little quality each time. Keep your MP3 original, and choose a AAC bitrate at least as high as the source for the best result.
For a 4-minute track, a typical MP3 file is about 6 MB and a typical AAC file is about 5 MB. Your own result depends on the bitrate and the audio itself.
MP3 vs AAC
AAC support: The codec is everywhere. A bare .aac stream is less common than M4A and often lacks duration and tag information.
MP3 support: Plays on virtually every phone, car stereo, TV, browser and media player made in the last 25 years.
| Detail | MP3 | AAC |
|---|---|---|
| Type | Lossy | Lossy |
| Codec | MP3 | AAC |
| Typical bitrate | 128 to 320 kbps; 192 kbps is a common balance | 96 to 256 kbps; 128 to 192 kbps is typical |
| A 4-minute track | about 6 MB | about 5 MB |
| File extensions | .mp3 | .aac |
| Best for | music libraries, podcasts and sharing when you cannot know what the listener uses | streaming-style files and hardware that expects a plain AAC stream |
| Introduced | 1993 | 1997 |
Quality and compatibility notes
- AAC: A bare ADTS stream has no real tag container, so title, artist and cover art are usually missing.
- MP3: Each re-encode loses a little more detail, and there is no true gapless support without extra tags.
- AAC bitrate range: 96 to 256 kbps; 128 to 192 kbps is typical.
- Tags: AAC stores none in the stream itself; some tools prepend ID3.
Questions
Does converting MP3 to AAC reduce quality?
A little. Both MP3 and AAC are lossy, so converting re-encodes the audio. A high bitrate keeps the loss very small, and keeping your original avoids any permanent change.
How big will the AAC file be?
For a 4-minute track, a typical MP3 file is about 6 MB and a typical AAC file is about 5 MB. Your own result depends on the bitrate and the audio itself.
Is my MP3 file uploaded anywhere?
No. The conversion runs in your browser on your device. The file is never sent to a server, and nothing is stored after you close the page.