Convert video to MP4
Convert MOV, MKV, AVI and WebM videos to MP4.
How to useVideo as MP4.
Available in: 
Convert video to MP4: what it is for
The tool converts MOV (iPhone), MKV, AVI and WebM videos to MP4, the format that works on any phone, TV, social network and editor. When possible, the conversion is done without re-encoding, in a few seconds.
The video is not sent to any server: everything is processed in your browser, so it works with personal files in full privacy.
How to use
- Upload the video.
- Wait for the conversion.
- Download the MP4.
When to use it
- iPhone videos that will not open on Windows.
- Screen recordings in WebM.
- Posting on social media.
Frequently asked questions
Does it lose quality?
When the video already uses a compatible codec (like iPhone MOV files), the conversion only swaps the "container" and loses nothing. In other cases, it is re-encoded at high quality.
Is the video uploaded to a server?
No. Processing happens in your browser, with FFmpeg running on your device. The file never leaves your computer or phone.
Why does it take a while?
The first time, the browser downloads the video processor (about 30 MB), which is then cached. Long videos take longer because everything runs on your device; on a computer it is much faster than on a phone.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.