Private AAC conversion
AAC to MP4 Converter
Create a standard MP4 video from AAC audio with a simple black 1280×720 background for video-only upload destinations.
The processing engine downloads once from a CDN. Your AAC file stays on this device.
How to use the aac to mp4 converter
- STEP 1Choose an AAC audio file up to 200 MB.
- STEP 2Convert it locally to MP4 with FFmpeg WebAssembly.
- STEP 3Download the finished MP4 file.
About this tool
An AAC stream alone is audio. This converter adds a real H.264 black video track and combines it with AAC audio in a compatible MP4 file.
The generated video uses a static black 720p frame for the full audio duration; it does not generate artwork or animation.
Conversion time and memory use depend on the source duration, bitrate, and your device.
Frequently asked questions
Does the MP4 include video?
Yes. It contains a real 1280×720 H.264 video track displaying a black background, plus the converted AAC audio track.
Is the AAC file uploaded?
No. FFmpeg WebAssembly runs the conversion in your browser. The processing engine is downloaded from a CDN, but your media stays on your device.
Is there a file-size limit?
Yes. The tool accepts AAC files up to 200 MB. Larger files can exceed browser memory limits.