media → media
Convert MP3 to AAC
Convert MP3 to AAC in seconds. Free, no signup, no watermark, no file-size limit. Runs on our conversion servers.
At a glance
- Source
- MP3
- Target
- AAC
- Where it runs
- Our servers
- Cost
- Free, unlimited
- Account
- Not needed
MP3 to AAC is on the release list
The audio is decoded, and optionally resampled or re-encoded, into the target container and codec. That needs a full document rendering engine, so it will run on our servers rather than in your browser. It is next in the queue and it will be free.
Do it now, on your device
These MP3 conversions work right now
Same source file, no upload, no account, no watermark. Pick one and the converter opens with sensible defaults already set.
The details
What happens when you convert between audio formats
The digital audio format that made music portable. The audio is decoded, and optionally resampled or re-encoded, into the target container and codec. The result is a advanced audio coding. what itunes, youtube and most streaming use, produced on our conversion servers.
What survives
- The duration and the timing
- The audio itself, to the quality the target codec allows
What changes
- The quality, because every codec that is not PCM is lossy
- The metadata, which is usually rebuilt rather than copied
Where it goes wrong
- Converting to a lossy format more than once is the fastest way to make audio sound bad
- The sample rate is often left as it was, so a 44.1 kHz file stays 44.1 kHz even if the target prefers 48 kHz
Why anyone would do this
The same recording, in a container the device in your hand will actually play.
About the format
The digital audio format that made music portable.
A stream of MPEG-1 Audio Layer III frames, each holding a slice of the audio plus a little compressed data about how to reconstruct the rest.
- Where it is good
- Plays literally everywhere
- Small enough to send over a slow connection
- Metadata (title, artist, album art) travels inside the file
- Where it falls short
- Lossy — a good encoder is transparent, a bad one is not
- No chapter markers, no multi-channel above stereo
- Metadata can be a privacy risk, since it records what you played
- You will find it on
- Every music player, podcast apps, phone recorders
The thing people miss
MP3 files can carry a private tag listing every track you have ever played — old MP3 players used it to show a heat map of your listening.
About the target
Advanced Audio Coding.
A series of MPEG-4 audio frames, each carrying a window of transformed, quantised spectral data.
- Better quality than MP3 at the same bitrate
- The native format of iPhones, iPads and the Apple ecosystem
- Works with the same .m4a container as video
Real jobs
What people are actually doing with MP3
A voice note or recording that has to play on anything
Shrinking an audio file for WhatsApp or email
Cutting a track to the part you actually need
Specification
The details, in one table
| Source format | MP3 — MP3 audio |
|---|---|
| Target format | AAC — AAC audio |
| Typical source size | 3–15 MB per track |
| Runs | On our servers |
| Account needed | No |
| Watermark | None |
| File extension | .mp3 → .aac .m4a |
How to
MP3 to AAC, step by step
- 01
Add your mp3 audio
Drag the file onto the drop zone, or tap to browse. Only one file is needed.
- 02
Choose the AAC settings
Set the AAC-specific options.
- 03
Download the result
The finished AAC downloads to your device. Nothing is uploaded and nothing is retained.
Also available
MP3 converts into
Queued for the servers
Questions
MP3 conversion questions
What actually happens to my MP3 file when I convert it to AAC?
The audio is decoded, and optionally resampled or re-encoded, into the target container and codec. So the MP3 file is unpacked, the content is laid out, and the result is written out as AAC. The duration and the timing survives unchanged.
Will converting MP3 to AAC reduce the quality?
Partly. The quality, because every codec that is not PCM is lossy The text itself is never re-typed, so no words are lost.
Is my MP3 file uploaded to a server?
This particular conversion needs a full document rendering engine, so it is processed on our servers. Your MP3 file is deleted automatically within an hour of the download being ready, and it is never opened or reviewed by a person.
Do I need an account or will there be a watermark?
Neither. There is no sign-up step, no email capture and no watermark on the output. The only limits are the ones your own device imposes.
What is the most common mistake people make when converting MP3 to AAC?
Converting to a lossy format more than once is the fastest way to make audio sound bad
Why would somebody convert MP3 to AAC at all?
The same recording, in a container the device in your hand will actually play. In short: a voice note or recording that has to play on anything
Something most people do not know about MP3?
MP3 files can carry a private tag listing every track you have ever played — old MP3 players used it to show a heat map of your listening.