Online CSS Editor with Instant Live Preview

Experiment with CSS the fast way: type a rule and watch it apply to real HTML in about one second. This free playground gives you a dedicated CSS tab next to live markup and JavaScript, so you can test layouts, colors, gradients, transitions and animations in one place — then export production-ready files.

Open the free editor

Why use this CSS playground

See every rule applied immediately

Your stylesheet is injected into the live preview as you type — tweak a value and the change paints in about a second, which makes experimenting with spacing, colors and shadows feel instant.

Real HTML to style against

You are not styling a static screenshot: the preview runs a real page with working markup, so flexbox, grid, positioning and pseudo-classes behave exactly as they will in production.

Smart completions for properties and values

The editor suggests CSS properties and snippet templates as you type, and accepts the highlighted suggestion with a single Tab — fewer typos, faster rules.

Try animations and transitions safely

Add keyframes and transitions and watch them loop in the preview. A built-in console captures JavaScript errors, so you can tell whether the problem is your CSS or your JS.

Export clean, separate files

Download a ZIP with style.css separated from index.html and script.js — a proper project structure you can drop into any site, CMS or framework.

Quick visual checks on mobile

Switch the preview between desktop, tablet and phone widths, or use the floating preview bubble on mobile to verify responsive styles without leaving the editor.

How to test CSS online in 4 steps

  1. 1

    Open the editor and switch to the CSS tab — a demo page with sample styles is loaded so you can see everything working.

  2. 2

    Edit the existing rules or write your own selectors; the preview restyles the page about a second after you stop typing.

  3. 3

    Adjust the HTML in its tab if you need different elements to style — the two tabs always refer to the same project.

  4. 4

    Download your styled page as a single HTML file or as a ZIP with style.css, or save it and share the link with your team.

Questions this tool answers

Frequently asked questions

Can I test CSS online without setting up a project?

Yes. Open the editor and start typing — there is no npm install, no build step and no account. The preview already contains a working page you can restyle immediately.

Does the CSS editor show updates instantly?

Updates land about one second after you stop typing. The debounce keeps the preview stable while you type; you can change the delay in the toolbar or disable auto-run entirely.

Can I use media queries and modern CSS features?

Yes — everything the browser supports works in the preview, including grid, flexbox, custom properties, container queries, :has(), animations and layered styles. The preview uses your actual browser engine.

How do I get my CSS out of the playground?

The Download menu offers a ZIP with style.css as a separate file plus index.html and script.js, or a single self-contained HTML file with the stylesheet inlined — whichever your workflow needs.

Can I preview responsive breakpoints?

Yes. The preview toolbar switches between desktop, tablet and mobile viewport widths, and on phones a floating live bubble keeps the result visible while you edit.

Is my stylesheet saved between visits?

Your project — HTML, CSS and JS — is auto-saved in your browser's local storage and restored on your next visit. Saving to the cloud and getting a share link is one click away whenever you want it.