AAC to MP4 converter

Convert AAC audio to an MP4 file, either as audio only or as a black-screen video for upload.

    Drop AAC files here or choose files.

    • 500MB and up to 30 minutes per file. Up to 5 files at a time
    • The first time you use it, the browser downloads the video engine (about 31MB)

    Audio only moves the sound into an MP4 container with no picture and finishes in seconds. For sites that only accept video, such as YouTube, choose Black-screen video (1280x720).

    Files never leave this device. Privacy policy

    Result

    Upload an AAC file and click Convert. The MP4 file will appear here.

    What to do next

    AAC to MP3 converter

    When you need an MP3 that plays anywhere.

    M4A to MP4 converter

    iPhone recordings (M4A) convert the same way.

    AAC to M4R converter (iPhone ringtone)

    Turn the audio into an iPhone ringtone.

    How it works

    Choose an AAC file and click Convert to save it as MP4. By default the audio is moved into an MP4 container without re-encoding, so it finishes in seconds and the sound is unchanged.

    For sites that only accept video, such as YouTube, choose Black-screen video. The tool puts the audio over a 1280x720 black frame and saves it as MP4.

    Things to know

    Check the copyright before uploading music. Some platforms do not recognize an audio-only MP4 as a video.

    Frequently asked questions

    What is the difference between audio-only MP4 and black-screen video?

    Audio-only MP4 keeps the sound untouched and only changes the container, so it finishes in seconds and the file size is about the same. YouTube and some social networks reject files with no picture, though. For those, choose the black-screen video, which puts the audio over a 1280x720 black frame. Because the picture never changes, the file grows only a little.

    What is the difference between AAC and M4A?

    The audio compression is the same. An AAC file holds the raw audio stream, while M4A and MP4 wrap that stream in an MP4 container. That is why the tool can swap the container without re-encoding.

    Does the black-screen video take long?

    Because the picture never changes, it is much faster than a regular video. On a computer, 30 minutes of audio takes about 1 to 2 minutes, depending on the hardware. Phones are slower and stop when the screen turns off, so a computer is recommended.

    Are my files uploaded to a server?

    No. The conversion runs entirely in this browser, and the file never leaves your device. The only download is the conversion engine, once. The result disappears when you close the page, so use the save button to keep it.

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