Meet WebM :
WebM is an audiovisual media file format Developed by
Google, It is 100% royalty-free.
it supports great video quality, The WebM is designed for the web
and supports a Transparency background (Alpha channel) in a video.
The WebM is a smaller size than the mp4 and mov formats
but worse in terms of quality.
The WebM has a way higher quality than a GIF and even is a smaller size
Video Converters that support Webm
Download one of those converters and convert your mp4 or any format to webm
hitpaw
video conventor
To convert a MOV video format with a Transparency background (Alpha channel)
we have another way to do this but its only working on pc unfortunately
nerdordie
Wev’e attached a tutorial on how to use it right and easily