Custom gallery with all images in a category

Probably I shouldn’t be asking here but i’m giving this a shot. I’ve made a website where i would upload 1 image in each post. Now i’ve got over 3000 and putting them in a page (for each category) will be really unefficient as then i’ll have to update it manually every time i make a new post. So I was wondering if there’s a way to create 1 page and make it grab all the image posts inside a category and make a gallery out of that. The reason for this is that this way it’s easier for mobile users to surf the site.

Thanks in advance

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