CSS Border Radius Generator

What is a CSS Border Radius Generator?

The CSS border-radius property rounds the corners of an element. While a single value rounds all four corners equally, you can also set each corner independently to create custom shapes. A border radius generator lets you adjust these visually and outputs the cleanest possible CSS.

Our generator gives you a slider for each corner plus a link toggle to control all four together. The live preview shows the rounded shape in real time, and the output collapses to a single value when all corners match.

How to Round Corners

• Keep corners linked to round all four equally with one slider
• Unlink to control the top-left, top-right, bottom-right, and bottom-left separately
• Watch the live preview reshape as you drag
• Copy the optimized border-radius declaration

Creative Uses for Border Radius

Equal rounding creates familiar rounded rectangles for cards and buttons. A very large radius turns a square into a circle (or a rectangle into a pill shape), perfect for avatars and tags. Mixing different corner values produces organic, asymmetric shapes increasingly popular in modern design.

Per-corner control is also handy for elements that connect to others, such as tabs that should be rounded only on top, or speech bubbles with one squared corner.

Why It Matters

Corner rounding strongly influences the personality of a design — sharp corners feel formal and technical, while rounded corners feel friendly and approachable. Consistent radii across components give an interface a cohesive, intentional look. This tool generates the CSS entirely in your browser.

Key Features at a Glance

• Link all four corners or control each one independently
• Sliders make rounding fast and visual
• Live preview reshapes in real time as you drag
• Output collapses to a single value when all corners match
• Copies a clean, optimized border-radius declaration
• Runs in your browser — free, private, and offline-capable

From Rounded Rectangles to Pills and Circles

Border-radius does far more than soften corners. With a single moderate value you get the familiar rounded rectangle of cards and buttons. Push the value high enough — at least half the element's height — and a rectangle becomes a pill shape, the staple of tags, badges, and toggle switches. On a square element, a radius of 50% turns it into a perfect circle, which is how avatars and icon buttons are usually made.

Setting corners independently unlocks another layer of design. Tabs are typically rounded only on their top two corners so they sit flush against the content below. Speech bubbles often square off one corner to point toward their source. Asymmetric radii — small on one corner, large on another — produce the organic, blobby shapes that have become popular in modern illustration-led interfaces. The generator lets you explore all of these without memorizing the longhand syntax.

Tips for Consistent Corners

• Pick a small set of radius values and reuse them across components
• Use a large radius (or 9999px) for reliable pill shapes at any height
• Apply 50% to a square element to make a circle
• Round only the top corners for tabs and stacked panels
• Match the radius to your brand mood — softer corners feel friendlier

Why Choose Our CSS Border Radius Generator?

Our border radius generator is free with no signup, no limits, and no subscription. It runs entirely in your browser, so the preview and CSS update instantly, work offline, and stay private — nothing is uploaded.

It is one of more than 200 free tools on ToopTools, and you can pin it to your My Workspace, a personalized workspace where you keep the tools you use most in a single dashboard. Beside the box-shadow and button generators, it helps you shape and style components and copy production-ready CSS without leaving your workspace.

Common Use Cases

Developers use border-radius constantly — on cards, buttons, inputs, images, modals, and avatars. Defining a consistent set of radii is one of the simplest ways to make an interface feel cohesive and intentional rather than thrown together.

Per-corner control covers the trickier cases: tabs rounded only on top, grouped buttons where only the outer corners are rounded, and decorative shapes that break the grid for visual interest. Designers prototyping a new brand use the tool to test how sharp versus rounded corners change the personality of their components before committing to a value.

Is the CSS Border Radius Generator free?

Yes. It is completely free with no account, no sign-up, and no usage limits. Round corners and copy the CSS as many times as you like at no cost.

How do I make a perfect circle?

Apply a border-radius of 50% to a square element — one where width and height are equal. The four corners round until they meet, producing a circle, which is how avatars and round icon buttons are made.

How do I create a pill-shaped button?

Use a radius at least half the element's height, or a very large value like 9999px. The corners round into full semicircles on each end, giving the smooth pill shape used for tags and toggles regardless of the element's width.

Can I round each corner differently?

Yes. Unlink the corners and set the top-left, top-right, bottom-right, and bottom-left independently. This is how you make tabs rounded only on top, speech bubbles, and asymmetric organic shapes.

Should I use pixels or percentages?

Pixels give a fixed corner size regardless of the element's dimensions, which keeps cards and buttons consistent. Percentages scale with the element and are best for circles and ellipses. Choose based on whether you want a fixed or proportional curve.

Is my design kept private?

Yes. The shape and its CSS are generated entirely in your browser, so nothing is uploaded. The tool is private and works without an internet connection.

How do I round the corners of an element with CSS?

Drag the radius sliders — together or per corner — and the live preview updates instantly. When the shape looks right, copy the generated border-radius CSS and paste it onto your element to round its corners exactly as shown.

Does the CSS border radius generator work offline?

Yes. The shape and its CSS are generated entirely in your browser, so once the page has loaded the tool works without an internet connection, and nothing you design is uploaded. You can create rounded shapes privately on your own device.