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Convert MP4 to AAC

Save the sound of a MP4 video as AAC – high quality, with optional cutting.

or drag them here, or paste with Ctrl+V / ⌘V

Audio and video files · up to 10 files at once

Conversion options

PDF pages

Leave empty for all, or type e.g. 1-3, 5, 8-

Resolution
PDF document
Page size
Images per page
Image resolution in the PDF
Image
Icon sizes (px)
Video

Lower resolutions reduce file size. The video will not be enlarged.

Audio
Bitrate

Higher means better sound and a larger file. “Auto” keeps the bitrate of the original (at least 128 kbit/s); from lossless files it uses the format’s high-quality setting.

Sample rate
Channels
Cut (optional)

Times such as 1:30 or 0:45.5. Leave empty to keep the whole recording.

Picture

The video shows this picture for the whole length of the sound – for example to upload music or a podcast to YouTube.

Video size
Document
Resolution
Pages to convert

Several pages arrive as a ZIP with one image per page.

Shown by e-readers in the library; leave empty to keep what the document says.

PDF/A-2b embeds all fonts so the file looks the same in many years; required by many courts and public offices.

Scales every sheet so it fits on a single page instead of being split across several.

Sheets

CSV and TSV hold one table: with “Every sheet” each sheet becomes its own file, together in a ZIP.

Separator

Excel in many European languages expects a semicolon; most other programs a comma.

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 7 days so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Audio and video files are uploaded only after you accept and are converted on our server. The input is deleted after processing; results are kept for 7 days. Privacy details

How to use: MP4 to AAC

  1. 1 Click “Choose files” or drop your MP4 video onto the page (up to 10 at once).
  2. 2 AAC is already selected as the output; open “Options” to set bitrate or channels, or to keep only part of the sound.
  3. 3 Click “Convert” and confirm the upload: the conversion runs on our server.
  4. 4 Follow the upload and the progress – you can keep browsing meanwhile.
  5. 5 Download the AAC file when it is ready; it stays available for 7 days unless you delete it.

About this tool

MP4 (H.264) is the most widely supported video format: it plays on every phone, computer, TV and website. AAC is the successor of MP3: better sound at the same size, used by Apple, YouTube and most streaming services.

This converter takes the sound of your MP4 video and saves it as AAC, the right choice for iPhone, iTunes, streaming and small files with good sound – for example the music of a clip, a recorded talk, lecture or interview, or the sound of your own phone videos. The sound keeps its quality by default; under “Options” you can choose the bitrate, mono or stereo, and cut out just the part you need. The picture and the video’s own data (such as the camera or the place it was filmed) are not copied into the audio file.

Files are converted on our server: the upload starts only after you confirm, the original is deleted after conversion and the result is kept for 7 days unless you delete it sooner.

Frequently asked questions

How do I convert MP4 to AAC?

Choose or drop your MP4 video, keep AAC as the output and click Convert. After you confirm the upload, our server saves the sound of the video as AAC and you download it.

Can I convert a YouTube video to AAC?

We do not download videos from YouTube or any other website – that is against their terms of use. If you have the video file itself, for example a video you made and downloaded from YouTube Studio, or a clip saved on your phone or computer, drop it here and you get its sound as AAC.

Will the sound keep its quality?

Yes. The sound is converted at high quality: “Auto” keeps the bitrate of the video’s own sound (at least 128 kbit/s). You can choose another bitrate under “Options”.

Can I keep only part of the sound?

Yes. Under “Options” enter a start and/or end time (for example 1:05 and 3:30) and only that part is saved.

How large can the video be?

Each file can be up to 300 MB and 10 hours long, and you can add up to 10 at once.

What happens to my video?

It is uploaded only after you confirm. The video is deleted as soon as the sound is saved, and the AAC file is kept for 7 days unless you delete it sooner.

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