HTML Viewer & Live Preview Playground
Write, edit, test, and render HTML markup, custom CSS stylesheets, and modern JS immediately. Fully secured, offline-ready sandbox.
100% Client-Side Secure
Your raw code compiles securely inside an isolated, sandboxed iframe completely within your local browser. No data ever leaves your computer.
Interactive Console Capture
Equipped with a custom interceptor that parses console logs, warnings, and unhandled syntax exceptions directly into the output panel.
AI Prompt & No-Code Friendly
Perfect companion for inspecting, testing, and modifying UI components produced by generative agents like Cursor, Bolt.new, or ChatGPT.
Free HTML Sandbox: Secure Online Code Editor & Previewer
Do you want to test HTML, CSS, and JavaScript code without installing any software? Our HTML Sandbox is a fully-featured, secure, and real-time online code editor that is excellent for web developers and learners. It provides you with a live environment where you can write code and see an instant preview. This tool uses client-side processing, ensuring your code remains private.
Why Do You Need an HTML Sandbox?
While learning web development or testing a UI component, developers need a fast and distraction-free platform. There is no need to open an IDE or create files. Just type the code in the HTML Sandbox and see the result instantly. It is perfect for rapid prototyping.
Key Features of the HTML Sandbox Tool
- Live Real-Time Preview: HTML, CSS, or JS code output is rendered instantly.
- 100% Secure & Private: The code is never executed or saved on backend servers. It runs entirely in the browser (client-side).
- Syntax Highlighting: Advanced syntax highlighting for HTML, CSS, and JavaScript.
- No Account Required: No login or signup is needed.
How to Build Responsive Designs?
You can test media queries in the sandbox's preview panel. You can check responsive layouts by writing `@media` in the CSS section. You can safely test DOM manipulation in the JavaScript section.
Frequently Asked Questions (FAQs)
1. Can I Use External Libraries (Bootstrap)?
Yes! You can include external CSS/JS by using CDN links in the HTML head section.
2. Is the Code Saved on the Server?
Absolutely not. This is a privacy-first sandbox. The code disappears when you refresh the page.
3. Is It Good for Beginners?
Yes, it is a great platform for students learning HTML, CSS, and JS.
4. Can I Run Backend Code (PHP, Node.js)?
No. It is only for frontend technologies since it relies on client-side browser execution.