AAC to MP4

Raw .aac files from recorders, apps and streams are not accepted everywhere. This converter places the AAC audio inside an MP4 container without changing the sound, and can add a black picture so the result can be uploaded as a video.

How to convert AAC to MP4

1. Choose your AAC file.
2. Pick Audio only or Add a black picture.
3. Click Convert and download the MP4.

AAC to MP4 features

• Lossless: the AAC audio is copied, not re-encoded.
• Optional black video track for YouTube, Facebook and Instagram.
• Correct duration and seeking in all players.

Uploading audio to YouTube

YouTube only accepts video files. Choose Add a black picture to turn your AAC recording into an MP4 video with a simple black background; the file stays small because a still picture compresses extremely well. After uploading, you can add a custom thumbnail in YouTube Studio.

Frequently asked questions

What is the difference between AAC and MP4?

AAC is an audio codec. A raw .aac file has no container, while MP4 (or M4A) is a container that adds timing and metadata, which makes seeking and playback more reliable.

Will the MP4 sound the same?

Yes, the audio is copied without changes.

Can I upload the result to YouTube?

Yes, choose Add a black picture so the MP4 contains a video track.

Is it free?

Yes, and no registration is needed.

Privacy, limits and file safety

Your files are processed on our own server, are never shared with anyone and are deleted automatically 60 minutes after processing. You can upload files up to 500 MB and 60 minutes long. No sign-up, no watermark and no software to install: it works in any modern browser on Windows, Mac, Android and iPhone.

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