Ah, there’s the misunderstanding. :) Use the Image Size app on iOS; it’s free. You’re probably not going to see a native resize tool on iOS because Apple doesn

Ah, there’s the misunderstanding. :) Use the Image Size app on iOS; it’s free. You’re probably not going to see a native resize tool on iOS because Apple doesn’t want users thinking about pixels or file sizes, just saving everything and converting down only when needed (Mail’s small/medium/large sending, etc.)