Development Tools
Border Radius Generator — Live CSS Preview
Drag sliders to build border-radius CSS with live preview. Copy one rule or four-corner syntax — free for web developers.
Border Radius Generator on FYN Tools is a free Development Tools utility. Open Border Radius Generator in your browser — no signup required. Border Radius Generator: Lets you drag four corners and copy the CSS border-radius shorthand. Input: Per-corner pixel or percent values. Output: border-radius CSS + live box preview. Related: Box Shadow Generator.
Privacy & processing: Runs in your browser on FYN Tools — no account required for basic use.
TL;DR: Border Radius Generator: Lets you drag four corners and copy the CSS border-radius shorthand. Input: Per-corner pixel or percent values. Output: border-radius CSS + live box preview.
Reviewed by FYN Tools Editorial · Guides ·
Data input / output
| Inputs | CSS parameters or markup/table paste |
|---|---|
| Outputs | Generated CSS snippet or JSON output |
| Formats | Copy-paste code |
| Limits | Preview in tool — paste into your project manually |
| Processing | Client-side (browser) |
How to Use the Border Radius Generator
- Adjust each corner radius individually using sliders
- Use the preset buttons for common shapes
- Preview the border radius effect in real-time
- Fine-tune the values for perfect curves
- Copy the generated CSS border-radius code
What is a Border Radius Generator?
Border Radius Generator: Lets you drag four corners and copy the CSS border-radius shorthand.
Inputs: Per-corner pixel or percent values. Outputs: border-radius CSS + live box preview. Mistake to avoid: copying only one corner when you needed the 8-value ellipsis form.
Border Radius Generator: Lets you drag four corners and copy the CSS border-radius shorthand.
How it works
Adjust radius per corner or link all corners; the preview box and CSS output update together for copy-paste into your stylesheet.
Explore more tools on our site.
Usage scenarios
- Card chip: Set 12px all around and paste into a card class.
- Pill button: Push radius to 999px and copy the one-line rule.
- Asymmetric blob: Uneven corners for a hero image mask.
Input / Output Examples
Input
Per-corner pixel or percent values
Output
border-radius CSS + live box preview
Input
Open /border-radius-generator and run a second sample
Output
border-radius CSS + live box preview (iterate settings if the tool has options)
Frequently Asked Questions
Can I set different radius values for each corner?+
Yes, you can set individual border-radius values for each corner (top-left, top-right, bottom-right, bottom-left) to create unique shapes.
What's the difference between pixels and percentages?+
Pixel values create fixed radius sizes, while percentage values create responsive curves that scale with the element size. Use percentages for perfect circles and ovals.
Can I create perfect circles with this tool?+
Yes, set the border-radius to 50% on a square element to create a perfect circle, or use different percentages for oval shapes.
Will the generated CSS work in older browsers?+
Border-radius is well-supported in all modern browsers. For very old browsers, consider adding vendor prefixes if needed.
Key Features
- Generate border radius
- Top left radius
- Top right radius
- Bottom left radius
- Bottom right radius
- Uniform radius
- Individual corner control
- Live preview
Benefits
Border Radius Generator runs without installing desktop software
Accepts: Per-corner pixel or percent values
Returns: border-radius CSS + live box preview
When to Use Border Radius Generator
- When you need lets you drag four corners and copy the CSS border-radius shorthand. without another app
- When your input looks like: Per-corner pixel or percent values
Advantages
- Border Radius Generator runs without installing desktop software
- Accepts: Per-corner pixel or percent values
- Returns: border-radius CSS + live box preview
- How-to and FAQs for Border Radius Generator live on the same page
Tips
- Read the Privacy & processing note before you paste secrets.
- Copying only one corner when you needed the 8-value ellipsis form.
- Copy Border Radius Generator output immediately if you will close the tab.
Common Mistakes
Copying only one corner when you needed the 8-value ellipsis form.
Treating one run as final without checking units or a second sample.
Ignoring related tools when the next step is resize, compress, or convert.
Summary
Use Border Radius Generator on this page, then browse related development tools linked below.