When you download a Loom, it is downloaded in the .MP4 format.
This is considered the most friendly format for videos.
The video is recorded as a WEBM file but is available for download as an MP4. We handle converting the video for you on our servers so you don't have to worry about pesky file formats and can focus on creating.
Here is a Loom showing you how to download and what format it is downloaded in: