CSS Triangle Generator [2025]

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Create pure CSS triangles effortlessly. Customize direction, size, color, rotation, and add optional borders with live preview.

✓ Pure CSS Output✓ Direction Control✓ Color & Opacity✓ Rotation Option✓ Optional Borders✓ Live Preview

Controls

Basic Shape

Direction

Width50px

Height50px

Appearance

Triangle Color

Opacity100%

Transformation

Rotation0°

Transform Origin

Add Border

Output & Preview

CSS Class Name

Include Settings Comment in CSS

Preview Background

Use Grid

Live Preview

Generated CSS

/* Generated by Terrific Tools - CSS Triangle Generator */
/* Settings:
 * Direction: up
 * Width: 50px
 * Height: 50px
 * Color: #3b82f6 (Opacity: 100%) => rgba(59, 130, 246, 1)
 * Rotation: 0deg
 * Border: Disabled
 */
.css-triangle {
  width: 0; height: 0; border-style: solid;
  border-width: 0 25px 50px 25px;
  border-color: transparent transparent rgba(59, 130, 246, 1) transparent;
}

Key Features

Triangle Customization

•
Direction & Dimensions
Point triangles up, down, left, or right, and control their width and height precisely.
•
Color & Opacity
Choose any color using hex codes and adjust transparency with an opacity slider.
•
Rotation & Origin
Rotate the triangle to any angle around a specified origin point for dynamic designs.

Advanced Options

•
Optional Borders
Add borders with customizable size, style (solid, dashed, dotted), color, and opacity.
•
Live Preview
Instantly see how your triangle looks as you adjust the settings, with background options.
•
Clean CSS Output
Get ready-to-use CSS code with an optional class name and settings comment.

Common Use Cases

UI Elements

• Tooltip arrows
• Dropdown menu indicators
• "Play" button icons
• Breadcrumb separators

Decorative Effects

• Geometric backgrounds
• Corner ribbons
• Speech bubble tails
• Section pointers

Layout & Design

• Visual hierarchy cues
• Masking effects (advanced)
• Creating simple shapes
• Indicating sort direction

Frequently Asked Questions

How does this work without images?

CSS triangles leverage the `border` properties. An element with zero width/height has its borders meet at a point. By making three borders transparent and coloring one, that colored border appears as a triangle.

How is the border effect created?

The optional border uses a CSS pseudo-element (`::before` or `::after`). This creates a second, slightly larger triangle of the border color positioned just behind the main triangle, giving the visual effect of a border.

Is the generated CSS cross-browser compatible?

Yes, the core border technique is universally supported. CSS transforms (for rotation) and pseudo-elements (for borders) are supported by all modern browsers (IE9+ for pseudo-elements).

Can I make triangles with different side lengths?

Absolutely. Adjusting the 'Width' and 'Height' sliders independently allows you to create various isosceles triangles (where two sides are equal). Combining this with rotation can create many different appearances.

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