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KioTools
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  • Runs locally

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Code Playground

What is this tool?

A free, browser-based code playground for testing HTML, CSS, and JavaScript. Write code in each pane and see the combined result rendered live, making it useful for quick experiments, demos, and debugging small snippets.

When to use it

  • Testing a CSS animation or layout idea quickly
  • Trying out a small JavaScript function before adding it to a larger project
  • Building a quick demo to share an idea with a colleague
  • Debugging a snippet of HTML/CSS/JS in isolation from a larger codebase
  • Learning web development by experimenting with live feedback

How to use it

  1. 1Open the Code Playground tool.
  2. 2Write your HTML in the HTML pane.
  3. 3Add styles in the CSS pane and scripting in the JavaScript pane.
  4. 4Watch the live preview update as you type.
  5. 5Copy your code once you're happy with the result.

Frequently asked questions

Can I use external JavaScript libraries in the playground?

The preview runs in a sandboxed frame under the site's security policy, which only allows external scripts from a short list of trusted CDNs, including jsDelivr and unpkg. Add them with a script tag in the HTML pane; libraries hosted anywhere else (cdnjs, for example) are blocked, so keep the code self-contained where you can.

Is my code saved anywhere after I close the tab?

No. Nothing you write is saved — not on a server and not in your browser — so copy your code before closing the tab if you want to keep it.

Does the JavaScript I write run on a server?

No, all code execution happens locally in your browser.

Can I use this for a full multi-page project?

It's best suited for small snippets, demos, and quick tests rather than managing a full multi-file or multi-page project.

Is this tool free to use?

Yes, it's completely free with no sign-up required.