Not sure if they have what you need, but Cloudinary has tons of resources for on demand image manipulation, and I believe they have a free tier: cloudinary.com/documentation/image...
Yep, looks like Cloudinary might be just what you want:
Uuuh thank you! It's kinda the opposite of what I need, but this lead me to Imagemagick and Four Point Distortion Methods, which seems to be the exact thing I need. Thanks!
Your lid is still missing BTW.
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