Convert MP3 to AAC
Convert your MP3 audio files to AAC directly in your browser.
How to convert audio in 3 steps
Choose a MP3 audio file.
Click convert to AAC.
Download your AAC audio.
Format descriptions
MP3 — MP3 is the best-known compressed audio format. It trades a little quality for much smaller files, making it perfect for music and audiobooks.
AAC — AAC (Advanced Audio Coding) is a lossy audio codec that is more efficient than MP3 at the same bitrate. It is the standard for MP4 video and modern devices.
Technical comparison: MP3 vs AAC
Technical breakdown of the MP3 and AAC specifications: compression, colour, transparency and animation support.
| Property | MP3 | AAC |
|---|---|---|
| Specification | MP3 (MPEG-1 Audio Layer III) | AAC (Advanced Audio Coding) |
| Media type | Audio | Audio |
| Compression | Lossy · Psychoacoustic model | Lossy · LC / HE-AAC |
| Color space / bit depth | 16-bit, 44.1 kHz | 16-bit up to 48 kHz |
| Transparency | Not applicable | Not applicable |
| Animation | No (static) | No (static) |
| Best for | MP3 is the best-known compressed audio format. It trades a little quality for much smaller files, making it perfect for music and audiobooks. | AAC (Advanced Audio Coding) is a lossy audio codec that is more efficient than MP3 at the same bitrate. It is the standard for MP4 video and modern devices. |
What happens when converting MP3 to AAC?
The MP3 data is decoded inside your browser with WebAssembly and re-encoded to the AAC specification, so no file is ever uploaded to a server. AAC uses lossy compression: the file gets far lighter, but a small amount of fine detail is discarded in the process.
Frequently Asked Questions
What is audio conversion?
Audio conversion changes an audio file from one format to another, for example from MP3 to AAC, while keeping the audio content.
Are my audio files uploaded?
No. This tool processes audio files directly in your browser. Your audio files are never sent to a server.
Which audio formats are supported?
This tool converts MP3 audio files to AAC, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many audio files as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in AAC format, ready to download and use.
About the audio converter
Convert MP3 to AAC audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Audio Converters
- Compress Audio OnlineCompress MP3, WAV, OGG, M4A, AAC, OGA, FLAC, ALAC, AIFF, OPUS, M4B and AC3 audio files online for free. Reduce the file size of your audio recordings while keeping good quality. Everything happens in your browser: audio files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP3 to WAVConvert MP3 to WAV audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP3 to OGGConvert MP3 to OGG audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert MP3 to M4AConvert MP3 to M4A audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.