I'm a professional PHP, Python and Javascript developer from the UK. I've worked with Django, Laravel, and React, among others. I also maintain a legacy Zend 1 application.
It's probably not the exact solution for you given that it's in PHP and it looks like your site is done in C#, but Glide allows you to create an endpoint in your application that serves up your images, and provides a simple API to allow you to dynamically resize, crop or reformat your images, as well as providing various effects and transformations, by simply specifying query parameters when fetching them. You do have to specify signatures so that it can't be misused, but that's straightforward enough.
If you can find a C# equivalent that would probably do the trick.
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It's probably not the exact solution for you given that it's in PHP and it looks like your site is done in C#, but Glide allows you to create an endpoint in your application that serves up your images, and provides a simple API to allow you to dynamically resize, crop or reformat your images, as well as providing various effects and transformations, by simply specifying query parameters when fetching them. You do have to specify signatures so that it can't be misused, but that's straightforward enough.
If you can find a C# equivalent that would probably do the trick.