I don't remember seeing this before, but Shutterstock has a new feature allowing a buyer to pick certain pre-set sizes (Facebook header, Pinterest, Instagram, etc.) and Filters - named after cities but a small-ish simple-ish set of tonal variations.
Underneath the small/medium/large radio buttons is a new one "Custom Size" and selecting that enables an Edit Image button (versus Download).
I think after you pick a set of choices you get both the edited version and the original when you download.
Possibly this might help buyers who need something quick for a Twitter post or email header (two of the choices). It's marked as Beta so I guess they're trying it out - nice to see improvements for buyers (I'm assuming they must have had feedback suggesting this would be appreciated).