Frequently asked questions
Are my videos uploaded anywhere?
No. The conversion runs entirely in your browser on your device, and your videos are never sent to a server.
Which formats can I convert between?
You can convert most common videos to MP4, WebM, MKV or MOV. MP4 with H.264 is the most widely compatible for sharing and playback.
Does converting reduce quality?
Converting to MP4, WebM or MOV re-encodes the video, which can slightly change quality and size depending on the settings. Converting to MKV simply repackages the existing streams, so it is fast and lossless when the codecs are compatible.
Why is it slow on big files?
All the work happens on your device using a built-in engine that downloads about 31 MB the first time. Re-encoding video is heavy, so large files and phones can be slow. Try one file at a time if needed.
How many can I convert at once?
Up to 20 videos, each up to 1 GB. Each finished file is held in memory, so a big batch can strain the tab; do smaller batches on modest devices.