Why a dedicated border-radius tool helps design systems and handoff
Product teams express radius scales in design tokens—often 2, 4, 8, 12, 16 px or rem equivalents. Engineers still need the exact border-radius shorthand that matches mockups when corners are not uniform (for example a card with only the top corners rounded). Guessing the four-value order or whether two-value shorthand applies slows code review. This page shows the live shape, emits minimal CSS, and documents the clockwise corner order so CSS border radius generator searches resolve to a repeatable workflow. Combine radii with accessible color choices from the color picker and verify text contrast with the contrast checker.
How to use this border radius CSS generator (step by step)
- Choose px, rem, or %. Use rem when your design system ties radii to typography; use % for circular avatars or fluid shapes where the box size changes.
- Enable Link all corners for a single slider, or disable it to set each corner on its own (order: top-left, top-right, bottom-right, bottom-left).
- Click Pill when you need a capsule button or tag: output becomes
border-radius: 9999px;, which is the usual pattern for horizontal pills of any width. - Optional: use Upload image to drop a screenshot or photo into the preview so you can see clipping against a checkerboard. Remove the image when you are done.
- Use quick presets (None through 24px) to snap to common pixel radii; values convert to your active unit. Then press Copy CSS and paste into stylesheets, Tailwind arbitrary values, or token files.
Border radius vs layout: Flexbox, Grid, and shadows
Rounding affects paint, not document flow. Structure content first in the Flexbox playground or CSS grid playground, then apply border-radius on the container or image. Depth and elevation usually come from box-shadow layered with your radii so cards read clearly in light and dark themes.
SEO and performance: CSS radii instead of bitmap corners
Vector-friendly rounded corners scale with resolution and zoom without extra PNG or WebP assets. That supports fast LCP when you avoid oversized full-bleed images for simple rounding. Keep decorative gradients in CSS when possible using the gradient generator so marketing copy stays selectable and accessible. For inclusive color palettes before you lock radii globally, generate scales with the tint and shade generator.
Related design and developer tools
More from the design and color tools category:
- Color Picker & Converter — Pick colors and copy HEX, RGB, HSL, and CMYK values for design systems and handoff.
- Color Contrast Checker — Test text and background pairs against WCAG AA and AAA contrast ratios for accessible UI.
- Color Palette Generator — From one base hue, build complementary, triadic, analogous, and monochrome palettes.
- Gradient Generator — Design linear and radial gradients visually and copy production-ready CSS in seconds.
- Tint & Shade Generator — Generate lighter tints and darker shades from a brand color for consistent UI scales.
- Color Blindness Simulator — Preview images or palettes under common color-vision deficiencies to validate inclusive design.
- Box Shadow Generator — Tune offset, blur, spread, color, and inset shadows with live preview and copyable CSS.
- CSS Gradient Generator — Build multi-stop gradients with angles and stops—outputs clean, modern CSS gradients.
- Flexbox Playground — Tweak flex container and item properties and see layout updates in real time.
- CSS Grid Playground — Prototype grid templates, gaps, and placement with instant visual feedback.
- Favicon Generator — Create favicon.ico and PNG sizes from an image or text for every device and browser tab.