Convert MP4 to AAC
Keeps the sound and throws away the picture.
- Free to try — no account for your first conversion
- Files up to 300 MB
- Deleted automatically, never looked at
About converting MP4 to AAC
The audio track is lifted out of the MP4 and written as AAC. Nothing about the sound is re-recorded — length, channels and sample rate come straight across — so what you get is the soundtrack as it was, in a file a fraction of the size.
How to convert MP4 to AAC
Add your MP4 file
Drag it onto the box above, click to browse, or paste it straight from your clipboard.
Check the settings
AAC is already selected. The defaults suit most files, and you can open Settings if you want to change the quality or size.
Download the AAC
Most files are ready in a second or two. Larger ones convert in the background while you watch the progress.
Quality
The file is re-encoded, so the AAC is visually equivalent rather than bit-for-bit identical. At the default settings the difference is not something you would notice.
File size
Up to 300 MB per file on this conversion
Speed
Runs in the background — you can watch the progress and download when it finishes
Questions people ask
- Is converting MP4 to AAC free?
- Your first conversion needs no account at all. A free account gives you three more, and a subscription removes the limit.
- What happens to my file?
- It is deleted automatically, along with the result, and nobody looks at either. Nothing you upload is used to train anything.
- How large can my MP4 file be?
- Up to 300 MB per file on this conversion
- Will the AAC look the same as the MP4?
- The file is re-encoded, so the AAC is visually equivalent rather than bit-for-bit identical. At the default settings the difference is not something you would notice.
- How long does it take?
- Runs in the background — you can watch the progress and download when it finishes