HTML Editor Online

A quick HTML/CSS/JS sandbox

Edit HTML, CSS, and JavaScript in the three panels and see the result update instantly in the live preview - useful for quickly testing a snippet, prototyping a small component, or checking how a bit of markup renders without setting up a local project. The preview runs in a sandboxed iframe entirely in your browser; nothing is saved or sent anywhere.

Why changes appear instantly as you type

Every edit to any of the three panels rebuilds the preview document immediately and reloads it into the iframe - there's no save step or refresh button needed, which makes this well suited to quick iteration: tweak a CSS value, see the visual result immediately, adjust again.

Why the preview runs in a sandboxed iframe

Rendering your code inside an isolated iframe, rather than directly in the main page, keeps whatever you're testing contained - your experimental JavaScript can't accidentally interact with or break the editor page itself, which matters when you're deliberately testing unfamiliar or exploratory code.

Testing a component before adding it to a real project

Pasting a self-contained snippet you found or wrote - a CSS animation, a small interactive widget, a layout technique - into this sandbox lets you confirm it actually behaves as expected before copying it into a real codebase, without needing to spin up a local dev server just to check one snippet.

Întrebări frecvente

Is my code saved if I leave the page?

No - this is a scratch pad for quick testing, not a saved project. Copy your code elsewhere before navigating away if you want to keep it.

Can I load external libraries like jQuery?

You can add a <script> tag pointing to a CDN URL inside the HTML panel, and it will load in the preview as long as the CDN allows cross-origin loading.

Why does the preview update without me clicking a button?

Every edit to any panel immediately rebuilds and reloads the preview - there's no manual refresh step, which makes it faster to iterate on small changes.

Is it safe to test unfamiliar JavaScript here?

The preview runs inside a sandboxed iframe, isolated from the main editor page, which contains most risks from code you're just testing - though you should still avoid pasting anything you don't trust at all.

Can I use this to prototype a full webpage?

It works well for small snippets and components, but for a full multi-page project with its own file structure, a local development environment or a dedicated code playground with project support is a better fit.