Convert AAC to MP4

Your AAC file stays on your computer and is never uploaded to our servers. We do the MP4 conversion in your browser.

Choose AAC File

How it Works

Choose your AAC file.
We read your AAC file and convert it to into MP4 format right in your browser. We do not upload your file to our servers.
Once your AAC file is converted to MP4, we save the converted MP4 file to your computer.

Why we built an in-browser AAC to MP4 converter

Existing online AAC to MP4 converters require that you upload your AAC file to their servers. They then do the MP4 file conversion on their servers. So your data essentially leaves your computer and now resides on a server that someone else runs.

If you have confidential AAC recordings, this might give you a pause.

We wanted to do better. We wanted to build an audio/video conversion tool that can be used securely, without the data ever leaving your computer. Many modern-day browsers are advanced enough that the file format conversion can be done right within your browser, without having to upload files anywhere. And this is exactly what we do.

When you select a file, we read the AAC contents into your browser, convert it into MP4 and save it back via your browser to your computer. Though the program that converts your AAC files comes from our servers, the converter program still runs directly in your browser.

We also hate intrusive ads that show up on many of the existing online audio converter sites. So we wanted to build an audio / video converter that’s not only secure, but also has a good & intuitive user experience.

Is the AAC to MP4 converter free and why?

Yes! This AAC to MP4 converter is 100% free to use for both personal and commercial use.

Our primary product is actually our AI-based Transcription Software that helps you convert recorded speech in audio and video files into text. We initially built this audio / video format converter tool for our transcription software users, but then figured that it’s useful enough to make available to everyone.

By giving away this AAC to MP4 converter for free, we hope that you will consider using our transcription software in the future, when you do have a need, or share this out with friends who might want to do transcriptions.

How long does the AAC to MP4 format conversion take?

It usually takes about 1/3rd the duration of your AAC file to convert it into a different format.

So if your AAC file is 30 minutes long, it should take about 15 minutes or less to convert itto MP4.

Please leave this page open until the MP4 conversion is fully complete.

Do you support other audio or video formats?

Yes! Here’s the full list of all the audio and video format converters we have:

If you have another audio or video format that you’d like us to add support for, please reach out to us at