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Hazuu Tools

Realtime HTML Editor

Write HTML, CSS, and JavaScript with instant live preview. A CodePen-like editor that runs entirely in your browser.

Live Preview
play_circleStart writing code to see live preview...
code3 panels opendata_objectHTML: 0 charspaletteCSS: 0 charsjavascriptJS: 0 chars
info

About Realtime HTML Editor

A Realtime HTML Editor is a browser-based coding environment that lets you write HTML, CSS, and JavaScript side by side and instantly see the rendered output in a live preview pane. Similar to tools like CodePen or JSFiddle, it eliminates the edit-save-refresh cycle so you can experiment with web code and see results as you type.

Our editor runs entirely in your browser with no server round-trips. Code is combined into a sandboxed iframe using the srcdoc attribute, giving you an accurate rendering of your work while keeping the host page secure. Whether you are prototyping a UI component, learning front-end basics, or debugging a CSS layout, this tool provides an instant feedback loop that accelerates your workflow.

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How to Use

01

Write Your Code

Enter HTML in the blue panel, CSS in the pink panel, and JavaScript in the yellow panel. Each panel can be collapsed if you do not need it.

02

See Live Output

The preview pane updates in real time as you type. Switch between vertical and horizontal layouts to suit your screen.

03

Copy or Reset

Click "Copy All" to grab the combined HTML document, or use "Clear" to start fresh. Load the sample demo to see a working example.

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Frequently Asked Questions

What is a Realtime HTML Editor? expand_more
A Realtime HTML Editor is an online tool that combines separate HTML, CSS, and JavaScript code panels with a live preview iframe. As you type in any panel, the preview updates instantly so you can see exactly how your code renders in a browser without manually refreshing.
Is my code sent to a server? expand_more
No. All code stays in your browser. The preview is rendered using a sandboxed iframe with the srcdoc attribute, so nothing is uploaded or stored on any server. Your work remains completely private.
Can I use external libraries or frameworks? expand_more
Yes. You can include external CSS or JavaScript libraries by adding <link> or <script> tags with CDN URLs directly in the HTML panel. The iframe will load and execute them just like a normal web page.
Does the JavaScript panel support modern syntax? expand_more
The JavaScript you write runs natively in your browser engine, so any syntax your browser supports (ES6+, async/await, etc.) will work in the editor. No transpilation step is involved.