CSS Gradient Border Generator
Generate a CSS gradient border using the border-image or padding technique with custom colours, width and radius.
Last reviewed by the Radiatus Cloud team
Generate a CSS gradient border with custom colours and width.
Need this done properly for your business?
Radiatus delivers secure cloud, DevOps & compliance engineering.
Create gradient borders with CSS
A gradient border frames an element with a smooth colour transition rather than a flat colour, giving a modern, eye-catching look. This generator produces the CSS using the mask technique, which supports rounded corners that the simpler border-image approach cannot. You choose two gradient colours, the border width, the gradient angle and the corner radius, and the tool outputs a reusable class.
The border is drawn on a pseudo-element and masked so only the frame shows the gradient, leaving the content area clean.
Rounded gradient borders made easy
Gradient borders with rounded corners are surprisingly tricky in CSS, which is why this generator uses the mask-composite method that handles them correctly. The result works across modern browsers and keeps the inner content unaffected. Gradient borders suit cards, buttons and highlighted panels where you want a premium accent.
Pick colours with enough contrast for the gradient to read clearly, and keep the width modest so it frames rather than overwhelms. All generation happens locally in your browser.
Notes on the generated code
Because the css gradient border generator runs entirely in your browser, you can experiment with every option and watch the generated code update instantly, with nothing uploaded and no account required. The output is clean, standards-based CSS that works in any project without external libraries or a build step, so you can paste it straight into your stylesheet and refine it further by hand whenever you need to.
Related tools
- Color Converter — Convert colours between HEX, RGB, HSL, HWB and OKLCH, with alpha support. Runs in your browser and shows the live swatch for each format.
- Accessibility Color Contrast Checker — Check foreground and background colour contrast against WCAG thresholds, with the rules for text size, UI components and states.
- Typography Scale Generator — Generate a modular type scale from a base size and ratio, with fluid clamp() values for responsive layouts.
- Design Token Generator — Generate design tokens as CSS variables, JSON or platform formats, structured in the layers that make them maintainable.
Frequently Asked Questions
Why use the mask technique?
It allows gradient borders with rounded corners, which the simpler border-image approach cannot produce cleanly.
Does it work in all browsers?
It works in modern browsers that support mask-composite. The generated CSS includes the webkit-prefixed version for wider support.
Can I use more than two colours?
Yes. Extend the linear-gradient in the generated CSS with additional colour stops for a multi-colour border.
Does the gradient affect the content?
No. The gradient is masked to show only the border frame, so the inner content area stays unaffected.
Privacy & Security
Everything runs in your browser; nothing is uploaded.
How to Use
Pick the gradient colours, width and angle, then copy the CSS.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
Color Converter
DesignConvert colours between HEX, RGB, HSL, HWB and OKLCH, with alpha support. Runs in your browser and shows the live swatch for each format.
Accessibility Color Contrast Checker
DesignCheck foreground and background colour contrast against WCAG thresholds, with the rules for text size, UI components and states.
Typography Scale Generator
DesignGenerate a modular type scale from a base size and ratio, with fluid clamp() values for responsive layouts.