Use the Download HTML button to export your code as a single preview.html file, with your CSS in a tag and JavaScript in a tag. Reopen it in any browser, or paste the code back into the editor later.

HTML Live Preview - Edit & Render Code in a Browser

HTML Live Preview Editor

HTML live preview lets you write HTML, CSS, and JavaScript and watch the result render instantly in your browser. It is a lightweight code playground — like a mini CodePen — with no sign-up, no install, and no local setup.

Whether you are learning web development or prototyping a quick idea, you get a fast feedback loop: type in the editor, and the preview panel updates on its own. Three separate tabs keep your HTML, CSS, and JavaScript organized, while a built-in console shows your logs and errors without opening browser DevTools.

Private by design: all editing, preview rendering, and console output happen entirely in your browser. Your code is never uploaded or stored on any server.

How to Use HTML Live Preview

Pick a tab and write code

Select the HTML, CSS, or JS tab at the top of the editor, then type your code. Syntax highlighting, auto-closing brackets and tags, and bracket matching are on by default.

Watch the live preview

The preview panel re-renders automatically a fraction of a second after you stop typing. Switch tabs to build your structure, style it, and add interactivity — the result updates either way.

Start from a template (optional)

Open the Templates menu to load a starter: Blank, Hello World, Flexbox Layout, or CSS Animation. Picking one fills all three editor tabs with working example code.

Inspect, expand, or download

Open the Console to read your console.log output, toggle the layout, drag the divider to resize, expand the preview to fullscreen, or click Download HTML to save a standalone file.

Features

Three-Tab Code Editor

Separate HTML, CSS, and JavaScript tabs powered by CodeMirror, with syntax highlighting for each language.

Instant Live Preview

Your code renders in a sandboxed iframe and refreshes automatically a moment after you stop typing.

Built-In Console

Captures log, warn, error, and info output plus runtime errors and unhandled promise rejections — no DevTools needed.

Smart Editing

Auto-closing brackets and tags, bracket matching, and two-space soft-tab indentation keep your code tidy.

Resizable Panels

Drag the divider between editor and preview to give either panel more room, clamped between 20% and 80%.

Layout Toggle

Switch between side-by-side and stacked layouts with one click — handy on narrower screens.

Fullscreen Preview

Expand the preview to fill your screen for a distraction-free view, then press Escape or close to return.

HTML Export

Download a complete standalone HTML file with your CSS and JavaScript embedded inline — no dependencies.

Starter Templates

Begin from Blank, Hello World, Flexbox Layout, or a CSS keyframe animation to skip the boilerplate.

Private & Local

Everything runs in your browser with a built-in dark theme. Nothing is uploaded or saved to a server.

Frequently Asked Questions

How do I preview HTML online without installing anything?

Just type your HTML in the editor — the preview panel renders it right away. There is nothing to download or sign up for: open the page, write code, and see the result in your browser.

Can I edit HTML, CSS, and JavaScript and see it live?

Yes. The editor has separate HTML, CSS, and JS tabs. Build your structure in HTML, style it in CSS, and add behavior in JavaScript — the preview combines all three and updates as you type.

Does the preview update in real time as I type?

Yes. After a short pause in typing, the preview re-renders automatically. The brief debounce keeps the preview smooth instead of flickering on every keystroke.

Is my code sent to a server?

No. All editing, preview rendering, and console output happen entirely in your browser. Nothing is uploaded or stored on any server.

Can I use external libraries like Bootstrap or jQuery?

Yes. Add a <link> or <script> tag in the HTML tab pointing to a CDN URL, and the library loads inside the preview iframe.

Why does my JavaScript not work?

The preview runs in a sandboxed iframe with allow-scripts and allow-modals permissions. Most JavaScript works normally, but some browser APIs that need extra permissions (like clipboard or geolocation) may be restricted. Open the built-in console to read any error messages.

Can I save my work?

Use the Download HTML button to export your code as a single preview.html file, with your CSS in a <style> tag and JavaScript in a <script> tag. Reopen it in any browser, or paste the code back into the editor later.

Does the editor work on mobile devices?

Yes. On smaller screens the layout switches to a stacked view, and the divider supports touch, so you can drag to resize the editor and preview on phones and tablets.