CSS Corner Smoothing Preview
Preview rounded and superellipse-ish corner styles.
Smoother, superellipse-ish corners
Standard border-radius corners can look slightly hard where the curve meets the straight edge. Smoother, “squircle”-style corners — like Apple’s icons — ease that transition. This tool previews rounded and superellipse-ish corner styles so you can compare the feel.
The difference is subtle but noticeable at large sizes, and seeing them next to each other helps you decide whether the extra smoothing is worth it for your buttons and cards. Preview the options and copy the CSS that fits.
Squircles, previewed
True corner smoothing needs an SVG or clip-path, since border-radius alone cannot soften the transition — the preview shows how close CSS gets. Runs in your browser.
Frequently Asked Questions
What does the css corner smoothing preview do?
It generates CSS from the options you choose and previews the result directly in your browser.
Can I use the CSS in production?
Yes. Copy the generated CSS as a starting point, then review naming, browser support, and design-system fit before shipping.
Does this upload my design values?
No. The generator runs locally in your browser and does not send your input to a server.
Is this free?
Yes. It is a free browser utility with no account required.
Practical utilities for front-end design and implementation work.