Private media conversion
M4A to MP4 Converter
Create a video-compatible MP4 from M4A audio using a real black 1280×720 H.264 background track.
The engine downloads once from a CDN. Your media remains on this device.
How to use the m4a to mp4 converter
- STEP 1Choose a M4A file up to 200 MB.
- STEP 2Convert it locally to MP4.
- STEP 3Download the finished MP4 file.
About this tool
Video-only destinations require a visual stream. This tool combines the source audio with a standards-based static black video track.
The output displays a black background for the recording's duration; it does not create artwork, captions, or animation.
Processing time depends on duration, source bitrate, output format, and device performance.
Frequently asked questions
Is this only a renamed M4A file?
No. The output contains a genuine H.264 video stream plus an AAC audio stream in an MP4 container.
Is my M4A file uploaded?
No. FFmpeg WebAssembly performs the conversion in your browser. The engine downloads from a CDN, but your media stays on your device.
What is the maximum file size?
The browser converter accepts files up to 200 MB. Long files may require substantial device memory.