Pixelmator will do everything you need for $10. You can happily resize, layer, drop-shadow, crop and export in a variety of formats. I'd skip downloading a .webp myself and use a higher-resolution screenshot as the source. If you need something simple to drop-shadow don't forget the Photo's app has a really good object isolation tool. You can just hold down on the subject and drag it into Pixelmator to add it as a layer.Firstly, on my Mac I have a very good image editor called Acorn. I use this app almost exclusively for resizing images for wallpaper or for inline inclusion in documents I am preparing. It would be nice if the iPad app could produce drop shadows for images. I also use it for image file type conversion (.webp to .jpg for example). I am looking for something similar for the iPad. I don't need high-end image editors, just something simple and easy to use. I have an app called CropSize which, as it's name implies, resizes image files - it does this very well but that's all it does.
I have a recommendation from another forum forHushPhotos - it certainly looks quite good. Others have suggestedAffinity Pro 2, it’s just too complicated for my modest needs.