How to "Merge Images into Sprite Sheet"?

Question

Web development

Google Web Designer saves HTML5 banner images alongside the .html file. And Yandex requires them to be combined into a “sprite sheet”, how to do this, they did not find anything.
Here is their requirement:

It is necessary to minimize the number of files in the archive. The images are combined into a sprite sheet. If necessary, you can combine all JS / CSS / Image documents and include them in an HTML file. The maximum number of files is 50.

Answer 1

The page source says

<meta name="generator" content="Web Presence Builder 17.0.16">

Answer 2

web presence builder

Answer 3

https://pentest-tools.com

Answer 4

https://builtwith.com

Answer 5

I don’t know how Yandex specifically has it, but a sprite sheet is just a giant picture that has all your backgrounds and icons. After its creation, you can specify background with the path to the image and the offset, scale for your blocks.