This free online AAC to MP4 converter lets you change aac audio files into mp4 video format right inside your web browser. There is nothing to install, no account to create and no watermark added to your result.
Unlike most converters, EverythingConverter never uploads your files to a server. The entire AAC to MP4 conversion happens locally on your own device, which means your documents and media stay completely private and the process works even on slow connections.
How to convert AAC to MP4
- Click the upload area above or drag and drop your AAC file into it. You can also browse and pick a file from your device.
- EverythingConverter reads the file directly in your browser and starts to convert it to MP4 automatically. Nothing is sent to any server.
- When the conversion finishes, your new MP4 file downloads right away. You can convert another file at any time, completely free.
AAC and MP4 explained
What is a AAC file?
AAC is the lossy audio format used by Apple Music, YouTube and most streaming services. It generally sounds better than MP3 at the same bitrate.
What is a MP4 file?
MP4 is the most universal video format, playable on nearly every device and platform. It combines H.264 video with AAC audio for an excellent balance of quality and file size.
Convert AAC to MP4 on any device
You can convert AAC to MP4 on Windows, Mac, Linux, Chromebook, Android and iPhone, straight from Chrome, Safari, Edge or Firefox. There is no app to install and no account to create. Because the conversion runs on your own device, it also works offline once the page has loaded, and you can convert as many files as you want.
Frequently asked questions
How do I convert AAC to MP4 for free?
Upload your AAC file to the converter above and it will be turned into a MP4 file automatically. The tool is completely free, with no limits on how many files you can convert and no watermark on the result.
Is it safe to convert AAC to MP4 here?
Yes. EverythingConverter converts your AAC file entirely inside your browser. Your file is never uploaded to a server, so no one but you ever has access to it. This makes it one of the most private ways to convert AAC to MP4 online.
Can I convert multiple AAC files at once?
Yes. You can drop or select as many AAC files as you like and they are all converted to MP4 in one batch, then bundled into a single ZIP download. It is the fastest way to bulk convert AAC to MP4.
Do I need to install any software?
No. The AAC to MP4 converter runs in any modern web browser on Windows, macOS, Linux, Android and iOS. There is nothing to download or install.
Is there a file size limit?
Because the conversion runs on your own device, the practical limit depends on your computer's memory rather than a server quota. Most everyday AAC files convert instantly, and there is no artificial cap.
How long does it take to convert AAC to MP4?
For typical files it is almost instant, since the conversion happens locally with no upload or download wait. Large media files take a little longer because your device does the encoding, but there is never a queue.
What is the difference between AAC and MP4?
AAC is the lossy audio format used by Apple Music, YouTube and most streaming services. It generally sounds better than MP3 at the same bitrate. MP4 is the most universal video format, playable on nearly every device and platform. It combines H.264 video with AAC audio for an excellent balance of quality and file size. Converting AAC to MP4 gives you the strengths of the MP4 format for your specific use case.