What this is actually doing.
Platform tools are really constraint checkers: they help you fit copy or creative into the space, ratio or limit the destination expects.
Social & Ads
Make this image fit an email.
Choose a newsletter-friendly output size and download a new copy.
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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.
Platforms can change rendering, safe areas and limits, and a technically valid asset can still be cropped or truncated in a live placement.
What to inspect.
Preview it at phone size and keep important text, faces and logos away from platform UI and edges.
Worth knowing.
Preview it where it will actually appear, especially on a phone. The platform UI is part of the layout whether you designed for it or not.