Convert MP4 to AAC
Extract the audio from MP4 videos and save it as AAC — ideal for efficient music files and broadcast audio.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert MP4 to AAC
- 1
Tap Choose files and select one or more MP4 files (or drag them in).
- 2
Check that AAC is selected. Use Advanced options for bitrate, channels or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your AAC downloads automatically. Converting several files? Grab them all as a ZIP.
MP4 vs AAC
Only the sound is kept — the picture is dropped, so the AAC file is far smaller than the MP4 video. Phone videos usually carry AAC audio, so in Smart mode the AAC is extracted instantly with zero quality loss.
| MP4 | AAC | |
|---|---|---|
| Full name | MPEG-4 Part 14 | Advanced Audio Coding (raw ADTS) |
| Type | Video | Audio |
| Compression | Lossy | Lossy |
| Developed by | MPEG | MPEG |
| Introduced | 2001 | 1997 |
| Plays on iPhone | ✓ Yes | ✓ Yes |
| Plays on Android | ✓ Yes | ✓ Yes |
| Plays on Windows | ✓ Yes | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About MP4 and AAC
MP4: MP4 is the universal video format. With H.264 video and AAC audio it plays on every iPhone, Android phone, smart TV, browser, WhatsApp, Instagram and YouTube.
AAC: AAC is the successor to MP3 and the audio codec behind YouTube, iTunes and most streaming services. A .aac file stores the raw AAC stream without an MP4 wrapper.
Frequently asked questions
How do I convert MP4 to AAC on my phone?
Will converting MP4 to AAC reduce quality?
Can I convert only part of the MP4?
Is this MP4 to AAC converter free?
Are my files uploaded to a server?
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