We used a Chrome-exclusive tech for animation generation here which had several limitations, such as limitations in quality, formats, and the results are not seamless repeatable.
Meanwhile, we have upgraded loading.io's editor with advanced features and formats support. To provide better results and supports to our users, we decided to migrate effects in makebackground.io to loading.io.
You can still download static images here, but for more options and formats, please go directly to loading.io.