CSS Triangle Generator
The CSS Triangle Generator creates pure CSS triangles using the border trick, outputting clean Bootstrap 5 HTML and a single .triangle CSS rule you can drop straight into any project. Configure direction, size, and color to get a live preview and copy-ready code. Built for front-end developers, UI designers, and anyone building tooltips, arrows, breadcrumbs, or decorative dividers without image assets.
Configuration
How to Use
1. Choose the triangle direction (up, down, left, right or a corner), shape and size using the controls. 2. Set the triangle color, optional background color, and any wrapper padding or alignment. 3. Preview the rendered triangle and its generated CSS in real time. 4. Copy the code and paste it directly into your Bootstrap 5 project.
Why Use This Tool?
Hand-coding CSS triangles with the border trick is error-prone and easy to forget between projects. This tool eliminates trial-and-error by calculating the correct border values instantly, giving you production-ready HTML with zero third-party dependencies and no JavaScript required in the output.
Frequently Asked Questions
What is the CSS Triangle Generator?
The CSS Triangle Generator is a free browser tool that builds pure CSS triangles using the CSS border trick and outputs Bootstrap 5 HTML with a .triangle CSS rule, ready to paste into any project without images or SVG files.
Can I use these triangles as tooltip arrows or callout pointers?
Yes. The generated triangles are zero-width, zero-height elements styled entirely with borders, which makes them ideal as ::before or ::after pseudo-element arrows on tooltips, dropdown menus, and speech bubbles. The output shows a standalone div, but you can copy the border declarations from the .triangle rule into a pseudo-element rule in your own stylesheet for even cleaner markup.
Is it free?
Yes, the CSS Triangle Generator is completely free with no signup required. Built by the Canvas Builder team.
Stop tweaking snippets. Build the whole site
This tool fixes one piece. Canvas Builder builds the entire page from a single prompt: sections, copy, styling, and responsive layout. You own the code.