unscreen.com — a website that can be used to remove or replace the background of videos and GIFs.
Go to the site. Upload a video, GIF, or select an animation from GIPHY. After that, the background will be automatically deleted.
If necessary, you can set one of the suggested backgrounds as a replacement.
Click Download to download the processed animation. It is also possible to download an archive in which the file is divided into separate frames.