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CSS Triangle Generator — Pure CSS, No Images, Live Preview

Generate a pure-CSS triangle — no image file, no SVG — using the classic zero-width/zero-height element with colored borders trick, with a live preview and direction control (up, down, left, right, diagonal), then copy the exact CSS.

How to use CSS Triangle Gen

  1. Choose the triangle direction.
  2. Adjust size and color.
  3. Preview the live result.
  4. Copy the generated CSS.

Frequently asked questions

How does a CSS-only triangle actually work?
A zero-width, zero-height element with only border styling collapses its borders into four triangular wedges meeting at a point — setting three border colors to transparent and one to your target color leaves just that one triangular wedge visible.
Why use CSS instead of an image or SVG for a simple triangle?
No extra HTTP request, trivially resizable and recolorable via CSS, and it scales cleanly at any resolution without needing multiple image sizes.
Can I make an equilateral triangle specifically?
Yes — set equal border widths on the two angled sides for an equilateral or isosceles shape; unequal widths produce a scalene triangle.

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