Free Developer Tool · No Sign-up
HTML Editor Online — Free, with Live Preview
Write and test HTML, CSS, and JavaScript online with an instant live preview. Start from 7 templates or a blank page, check mobile responsiveness, go fullscreen, and download your work — all free, right in your browser.
How to Run HTML Online in 3 Steps
- 1
Write or paste your code
HTML in the editor — with CSS in style tags and JavaScript in script tags — or load one of the 7 templates.
- 2
Watch the live preview
Every keystroke re-renders instantly in the sandboxed preview panel. Toggle mobile width to test responsiveness.
- 3
Download or keep iterating
Export as a standalone .html file, or use fullscreen mode for longer sessions.
Everything the Editor Includes
A complete HTML/CSS/JS playground — free, private, and fast.
Instant Live Preview
See HTML rendered in real time as you type — the fastest feedback loop for learning and prototyping.
7 Ready Templates
Starter page, profile card, contact form, CSS grid gallery, navbar, animation, and landing page.
Split Layouts
Side-by-side or stacked editor/preview — pick what fits your screen.
Mobile Preview
One click switches the preview to 375px width to test responsive behavior.
Fullscreen Mode
Maximize the workspace for distraction-free coding sessions.
Download as HTML
Export your work as a standalone file — open it in any browser or keep building in an IDE.
What People Use This Editor For
The zero-setup editor fits anywhere a full IDE is overkill:
- Learning HTML and CSS with instant visual feedback — the fastest way to understand what each tag does
- Prototyping layouts and CSS animations before committing them to a real project
- Testing email signature and embed snippets safely in a sandbox
- Preparing code examples for presentations, tutorials, and documentation
- Building small standalone pages — landing pages, profile cards — without a dev environment
Frequently Asked Questions
How do I test HTML code online for free?
Type or paste your HTML, CSS, and JavaScript into the editor above — the live preview updates instantly as you type. No account, no install, no limits; you can also start from one of 7 templates.
How does the live preview work?
As you type, the preview panel re-renders your code in a sandboxed iframe entirely in your browser — no server round-trips, which is why updates are instant and your code stays private.
Can I use JavaScript in the editor?
Yes. Inline scripts and script tags run inside a sandboxed iframe for security, so they cannot access your browser data or navigate away from the page.
Is my code saved or sent anywhere?
No. All code stays in your browser — nothing is uploaded or stored on any server. Download your work as a standalone HTML file whenever you want to keep it.
How is this different from CodePen or VS Code?
It is the zero-setup middle ground: faster than opening an IDE, no account like CodePen requires for saving. Ideal for quick experiments, learning, and testing snippets — graduate to VS Code when projects grow beyond one file.
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