Convert MP3 to AAC for free
Convert your MP3 files to AAC right in your browser, one or many at a time, without uploading them to any server.
Drag your audio files here or click to choose them
- .mp3
Use your Google Drive without giving up your privacy
Pick files from your Drive, process them here and save the result to any folder you like. Everything happens in your browser: ShiftAny has no servers of its own.
- Your Google Drive
- Your browserAll processing happens here
- Your Drive or your device
- Your files travel straight between Google and your browser. They never touch a server of ours, because we don’t have any.
- Processing runs on your device, exactly as it does with a file from your computer.
- The app can only access the files you pick and the ones it saves to your Drive. Never the rest.
- Access expires after one hour and is never stored. This browser only remembers your name and email so you can reconnect in one click; you can disconnect at any time.
- Processing
- In your browser
- Upload
- No upload to ShiftAny
- Account
- No sign-up
- Price
- Free
- Input
- MP3
- Output
- AAC
- Platform
- Web browser
How to use “MP3 to AAC”
- Add the MP3 files you want to turn into AAC: you can drop several at once.
- Choose the AAC kbps: there is no need to go above the MP3’s, because lost quality does not come back.
- Click “Convert to AAC” and wait while each MP3 is processed.
- Download each AAC on its own, or all your converted MP3 files in a ZIP.
From MP3 to AAC: what to expect
AAC is the lossy codec of Apple Music, iTunes and many phones, and at the same kbps it usually sounds better than MP3. The file comes out as .aac (an ADTS stream), which VLC, Windows, macOS, Android and iOS can open. Starting from an MP3 means re-encoding: AAC cannot recover what the MP3 already lost, so asking for more kbps than the original only makes the file bigger. Your own browser encodes it: you need current Chrome or Edge on Windows, macOS or Android, and if its encoder tops out below the kbps you chose, the result says so.
Are my files uploaded?
No. ShiftAny Audio processes your audio directly on your device: this tool runs in your browser and never sends your files to any server.
Limits and metadata
ShiftAny sets no duration or size limits: the real ceiling is your device’s memory, because the audio is decompressed to be processed and an hour of stereo takes more than 1 GB. With very long files, we warn you before loading them. The new file contains only the audio: tags (title, artist, cover art) are not copied.
Frequently asked questions
What is the difference between AAC and M4A?
Both carry AAC audio. An .aac file is the audio stream as it is; an .m4a stores it inside an MP4 container with an index and metadata. This tool makes .aac files; if you need the MP4 container for a ringtone, use “MP3 to M4R”.
Does converting MP3 to AAC improve the sound?
No. The AAC starts from the already decoded MP3 and is encoded again, so it can only match it, never improve on it. It is worth it when a device or app asks you for AAC.
Which kbps should I choose for AAC?
128 kbps is enough for listening to music and 96 is enough for speech. Choosing more than the source MP3’s bitrate does not add quality.