RatioFit
About RatioFit
RatioFit exists because crop math is boring and easy to get wrong at 11 p.m. before an upload. You should not have to open a spreadsheet to turn a 1920-wide 16:9 master into a 9:16 cut, or to check that 1080×1350 is actually 4:5.
The site is a static Astro build. There is no app backend, no file pipeline, and no account. Type a ratio or a W×H pair, lock one side, copy the other. Optional preview shows the proportion — not a 1:1 pixel canvas — so you can see landscape versus vertical before you export.
We keep dedicated pages for the frames people search for: 16:9, 9:16, 1:1, 4:5, 21:9, plus YouTube, Instagram, TikTok, and Reels. Platform numbers change; when they do, we update the size tables.
RatioFit is AdSense-ready: content pages, a privacy policy, and labeled ad slots. Ads stay off until a publisher ID is set. The calculator does not depend on them.