Video Converter (to MP4 or WebM)
Convert WebM, MOV, MKV, AVI and other videos to MP4, the format that plays everywhere, or convert to WebM for the web.
🔒 Your files never leave your device. This tool runs entirely in your web browser. Nothing is uploaded to ToolsCloset or anyone else, so it’s safe for private photos, recordings and videos.
By Shah Rukh, software developer · Last updated:
How to convert a video
- Choose your video file.
- Pick MP4 (recommended) or WebM.
- Press Convert video, keep the tab open, and download the result.
The first time you use this tool, your browser downloads the media engine (about 31 MB, FFmpeg compiled to WebAssembly). It’s cached afterwards, so later uses start quickly. A computer is much faster than a phone for long files.
Common conversions
- WebM to MP4: screen recordings and web downloads often come as WebM; MP4 plays on every phone and editor.
- MOV to MP4: iPhone and Mac videos are MOV; MP4 is easier to share on Windows and Android.
- MKV to MP4: MP4 works on more TVs, phones and social networks.
Need a smaller file as well? Try the video compressor.
Frequently asked questions
Which format should I choose?
MP4 with H.264 is the most compatible choice for phones, computers, TVs and social media.
Why is conversion slow?
Re-encoding video is heavy work for a browser. Short clips and a computer make it much faster.
Is my video uploaded?
No. It’s converted on your device.
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