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MP4 to AAC · Free

Convert MP4 to AAC

Pull the audio out of your MP4 file and save it as AAC, right in your browser.

  • Free to start
  • In your browser
  • Up to 500 MB
How it works

How to convert MP4 to AAC

  1. Upload your MP4 file

    Drag and drop a MP4 file, or click to browse. Up to 500 MB, and nothing is installed.

  2. Confirm AAC as the output

    AAC is already selected for your MP4. Switch between MP3 and WAV if you change your mind.

  3. Convert and download

    We convert the MP4 on our servers, usually in under a minute. Create a free account to download the AAC, or keep editing it in REQO.

Why convert MP4 to AAC?

MP4 is the closest thing video has to a universal format: an MPEG-4 container that almost always holds H.264 video and AAC audio, which every browser, phone, TV and social platform can play without a plugin.

The practical problem: MP4 is already the safest format, so the usual reason to convert away from it is a specific destination that wants something else.

AAC solves that. Efficient modern codec, standard inside MP4 and streaming.

Container

MP4MPEG-4 Part 14
AACRaw AAC / ADTS stream

Typical codecs

MP4H.264 video, AAC audio
AACAAC (lossy)

Best for

MP4Sharing anywhere, uploads, web embeds
AACAudio pulled out of video files

Plays on

MP4Every phone, browser, TV and editor
AACMost modern devices; bare streams can confuse players

File size

MP4Small for the quality
AACSimilar to MP3, slightly better quality
FAQ

MP4 to AAC questions

Is the MP4 to AAC converter free?

Yes. Convert and preview the result for free, then create a free account to download it. There is no per-file charge and no watermark on the AAC itself beyond the free-plan badge.

Do I need to install any software?

No. The conversion runs on our servers and the whole flow happens in your browser, so it works the same on Windows, macOS, Linux, iPhone and Android. Nothing to install at either end. Where MP4 plays: Every phone, browser, TV and editor. Where the AAC you get back plays: Most modern devices; bare streams can confuse players.

Does converting MP4 to AAC reduce the quality?

The audio is decoded from the video and written as AAC. MP3 is a lossy format, so there is a small re-encode, inaudible for speech at the default quality. The picture is discarded entirely, which is why the file gets so much smaller.

How large a file can I convert?

Up to 500 MB per file, which is more footage in some formats than others. MP4: Small for the quality. AAC coming back: Similar to MP3, slightly better quality. For anything bigger, trim or compress it first, both are free tools here.

Is my file kept private?

Your upload is processed and then held only as long as your project needs it. Nothing is published, indexed or shared unless you create a share link yourself.

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Free, in your browser, and the file stays open in a full video editor afterwards.