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Thanks nikolina. The site seems to give a lot of options: what app did you use? Was it a trial?

I did not use any app, I just used their website. Here is a more specific link:
https://ctrlq.org/images/

Ok, this actually worked instantly. I was getting rather frustrated... Thanks so much for being my image-hero! (and following!)

You are very welcome!
I know exactly how you felt, it was the same for me, hehe! :)