What this is actually doing.
This is the focused version of “Cover / thumbnail maker”: do the one job, inspect the result, and move on without opening a full editor.
Social & Ads
Make a cover or thumbnail.
Choose a common cover shape, preview the crop, and download a new copy.
1 Choose2 Adjust3 Live preview4 Download
Stays on your deviceYour image stays on your device. Resizing, cropping and export happen in this browser.
Useful to know
Four things worth knowing.
Where it stops.
It solves the named job, not every problem around it.
What to inspect.
Preview it at phone size and keep important text, faces and logos away from platform UI and edges.
Worth knowing.
Keep the original until the finished result has worked in the place you made it for.