ok so hopefully this doesnt annihilate the servers of this poor website but, what i use to convert webp’s is https://ezgif.com/
it has converters for myriad file types including video to gif, webp to png/gif/jpeg, png to pdf, and more; different ways to make and edit gifs, including special effects and adding text; there’s a resizing tool, clip splitter (only for animated gifs and such), and some more doodads. i love this website
they even added a sprite sheet creator ?? i think it extracts a sprite sheet from a gif but i havent used it yet
ezgif is the only converter site that doesn’t spam you with ads in my experience (i use an adblocker tho so maybe that biases it). helps that the interface is geared towards actual use too, you can chain tools without needing to upload the file again and again.
on android theres also a very cool foss app called Image Toolbox that has basically everything you need to handle images. it even has OCR!