[lonelappde]

This is a feature of lichess, which is free and open source.

[modernerd]

How do you generate an image from a position on lichess?

They have a board editor: https://lichess.org/editor/rnbqkbnr/pppppppp/8/8/8/8/PPPPPPP...

But I've not seen an option to generate an image (aside from taking a screenshot), which is what the posted site appears to have been made for.