You can just enter the position on the analysis board.
https://www.chess.com/analysis
You can paste in a pgn. There are many options.
A tool to analyse a given position
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This question has probably been asked but I can't find any valid answer.
I would like to create a given situation, actually one where I did a mistake but can't find out what, and ask an engine to show me which was the best move.
I am sure this exists, but it is not that easy to find, more of this at a good price or for free