Video Converter
Convert videos between MP4, WebM, MOV, MKV and AVI in your browser. Compatible files are rewrapped without re-encoding.
Free · No upload · 100% on your device
Video Converter
Choose videos, or drop them here.
MP4, MOV, MKV, WebM, AVI and more · No size or length limit. Nothing is uploaded.
100% on your device
How to use Video Converter
- Choose your videos, or drop them on the page.
- Pick the settings in the side panel.
- Select “Convert video”. The first use downloads the video engine once.
- Download the result. Your original file is left unchanged.
Private by design. Your files are processed in this browser tab and are never uploaded to KittySuite.
About Video Converter
Choose one or many videos and the format you need. When the video and audio inside already suit the new format, KittySuite only rewraps them, which is fast and loses no quality; otherwise it re-encodes with H.264 (MP4, MOV, MKV), VP8 (WebM) or MPEG-4 (AVI). Everything runs in this tab with FFmpeg compiled to WebAssembly, so the files never leave your device and there is no size or length limit beyond what your device can process.
Processing happens in this tab with FFmpeg compiled to WebAssembly; your files are never uploaded. The first video or audio tool you use downloads the 10 MB engine once and keeps it cached for next time. Long or high-resolution videos take longer than on a desktop editor, especially on phones, where files are processed one at a time to stay within memory. Keep the tab open until the download appears.
Video Converter: frequently asked questions
How do I convert a video to MP4?
Choose one or more videos, pick MP4 and convert. When the video and audio inside already suit MP4, they are only rewrapped, which is fast and keeps the full quality.
Which video formats can I convert?
You can open MP4, MOV, MKV, WebM, AVI, WMV, FLV, MPEG, TS, 3GP and most other common video files, and save as MP4, WebM, MOV, MKV or AVI.
Will converting reduce the video quality?
Not when the streams can be rewrapped. Otherwise the video is re-encoded with H.264 (MP4, MOV, MKV), VP8 (WebM) or MPEG-4 (AVI), which keeps good quality but is not bit-for-bit identical.
Is there a file size or length limit?
No fixed limit. Long or high-resolution videos take longer, especially on phones, where files are processed one at a time to stay within memory.
Are my videos uploaded to a server?
No. FFmpeg runs inside your browser. The first video or audio tool you use downloads the roughly 10 MB engine from this site once; your files are never uploaded.