web

CSS Selector Tester

Paste HTML and a CSS selector and see exactly which elements match. Great for debugging selectors and learning CSS.

HTML

<div class="hero">
  <h1>Hello world</h1>
  <button class="btn primary">Click me</button>
  <button class="btn">Read more</button>
  <ul>
    <li class="item active">First</li>
    <li class="item">Second</li>
    <li class="item">Third</li>
  </ul>
</div>

CSS Selector

Highlighted HTML (0 matches)

No matches

How to use CSS Selector Tester

1Paste your input in the panel above or use the example data if available.
2Choose an action — format, generate, convert, encode, or analyze.
3Your result appears instantly. Use Copy to grab it, or Download if a file option is shown.

Runs entirely in your browser

Nothing you type, paste, generate, or upload leaves your device.

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