Browser FFmpeg recipe
Convert MOV to MP4 Online with FFmpeg
Create a broadly compatible MP4 from a MOV source file.
Command
Run this FFmpeg command
ffmpeg -i input.mov -c:v libx264 -crf 23 -preset fast -c:a aac -b:a 128k -movflags +faststart output.mp4When to use it
- iPhone videos
- QuickTime exports
- web uploads
How it works
- Upload your MOV file.
- Run the MP4 compatibility command.
- Download the converted MP4.
Option reference
| Option | What it does |
|---|---|
-c:v libx264 | Converts video to H.264. |
-c:a aac | Converts audio to AAC. |
-movflags +faststart | Moves metadata for faster web playback start. |
Practical notes
- If the MOV already uses compatible streams, a copy command may be faster.
- Re-encoding improves compatibility but can take longer in the browser.
FAQ
Will this work with iPhone MOV files?
Usually yes. Large 4K files may take longer because processing happens on your device.
Why not just rename .mov to .mp4?
Renaming does not change the container or codecs. FFmpeg writes a real MP4 output.