CSS Triangle & Polygon Generator
Create pure CSS triangles pointing in any direction (up, down, left, right, diagonal) using transparent border tricks or modern clip-path polygons.
How the CSS Border-Hack Triangle Works
When an HTML element has a width and height of zero, but non-zero border widths, the borders meet at 45-degree angles in the center. By making three borders transparent and giving one border a color, a sharp geometric triangle is rendered.
Border Trick vs. Clip-Path
- Border Hack: Works in 100% of browsers dating back to IE6. Ideal for tooltip carets and dropdown arrow pseudo-elements (
::after). - clip-path: polygon(): Modern standard that allows applying backgrounds, gradients, and hover transitions directly to triangular surfaces.
How to Use CSS Triangle & Polygon Generator (Step-by-Step)
Select 'Border-Hack Method' or 'CSS clip-path Polygon'.
Pick triangle direction (Top, Bottom, Left, Right, or Corner diagonals).
Adjust width, height, and color values.
Copy the CSS snippet directly into your stylesheet.
Applications
Common Use Cases
- Create dropdown arrow carets and tooltip pointers without icon fonts.
- Build decorative geometric polygons and chevron accents.
- Export CSS ::before or ::after pseudo-element rules.
Privacy Guarantee
Zero Server Uploads
Unlike traditional online converters that upload your confidential documents to external cloud servers, MultiToolX executes computations in your browser runtime via HTML5 Canvas, Web Crypto, and WebAssembly.
Your data never leaves your device and cannot be viewed, stored, or harvested by anyone.
How to Make CSS Triangles & Polygon Clip-Paths Without Images
A developer guide explaining how to create pure CSS triangles using zero-width border hacks and modern clip-path polygon coordinates.
FAQ
Frequently Asked Questions
How does the CSS border triangle trick work?
By giving an element zero width and height and three transparent borders, the fourth colored border renders as a clean diagonal triangle.
When should I use clip-path instead of borders?
Use clip-path: polygon(...) when you want to apply gradient fills, background images, or hover transitions to the triangle.
Are border triangles compatible with all browsers?
Yes. Border triangles work on 100% of browsers dating back decades.
Embed the CSS Triangle & Polygon Generator on Your Website or Blog
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