CSS Border Generator [2025]

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Visually design CSS borders and rounded corners. Control width, style, color, and radius with instant code generation.

✓ Live Preview✓ Width, Style, Color✓ Border Radius✓ Individual Side/Corner Control✓ Unit Selection✓ Instant CSS Code

Border Controls

2px
8px
1px
0px

Live Preview

Preview Element

Generated CSS

.your-element {
  border: 2px solid #3b82f6;
  border-radius: 8px;
  outline: none;
}

Apply the generated CSS rules to your target HTML element.

Understanding CSS Borders

CSS borders allow you to create outlines around HTML elements. You can control their thickness (`border-width`), appearance (`border-style`), and color (`border-color`).

The `border-radius` property is used to round the corners of an element's outer border edge. You can set a single value for all corners or specify individual values for each corner (top-left, top-right, bottom-right, bottom-left).

This generator helps you visualize these properties and provides both shorthand (e.g., `border: 1px solid black;`) and longhand (e.g., `border-top-width: 2px;`) CSS rules depending on your selections.

Key Properties Controlled

Border Properties

  • border-width: Sets the thickness of the border (all sides or individual).
  • border-style: Defines the line style (solid, dashed, dotted, etc.).
  • border-color: Sets the color of the border lines.
  • border: Shorthand for setting width, style, and color for all sides.
  • border-top, -right, -bottom, -left: Shorthands for individual sides.
  • border-*-width, -style, -color: Longhand properties for individual sides.

Border Radius Properties

  • border-radius: Shorthand for setting all corner radii.
  • border-top-left-radius: Radius of the top-left corner.
  • border-top-right-radius: Radius of the top-right corner.
  • border-bottom-right-radius: Radius of the bottom-right corner.
  • border-bottom-left-radius: Radius of the bottom-left corner.

Frequently Asked Questions

How do I use the generated CSS?

Copy the generated CSS code block. Replace `.your-element` with the actual class or ID selector of the HTML element you want to style, and paste the code into your stylesheet.

What's the difference between shorthand and longhand properties?

Shorthand properties (like `border` or `border-radius`) set multiple related properties at once, usually for all sides/corners equally. Longhand properties (like `border-top-width` or `border-top-left-radius`) control specific aspects individually. This generator uses shorthand when "All Same" is toggled on and longhand when it's off.

Can I use units other than pixels?

Yes! You can select units like `px`, `em`, `rem`, or `%` (for radius) using the dropdown menus next to the width and radius sliders. The generated CSS will reflect your chosen unit.

Why does the `border` shorthand disappear when style is 'none'?

When `border-style` is `none` or `hidden`, the border is not displayed, regardless of width or color. While you *can* technically define width and color, it's often redundant. The generator simplifies the output to just `border-style: none;` in this case, which is usually sufficient. If you need specific widths/colors for layout purposes even with `none`, you might need to add those properties manually or use the individual side controls.

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