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Free HTML CSS JS compiler with manual Run, live preview, console, import design, export & share. 100% local. # HTML Compiler — Free HTML, CSS & JavaScript Editor with Live Preview Write, edit, test, and run **HTML, CSS, and JavaScript directly in your browser** with a fast, simple, and privacy-focused HTML compiler. Build web pages, experiment with frontend code, preview your designs, and export your projects without installing a development environment. **Manual Run is enabled by default**, so you decide exactly when your code is compiled and the preview is updated. Press **Run** or use **Ctrl+Enter** whenever you're ready. No setup. No registration. No unnecessary distractions. ## Key Features ### Manual HTML, CSS & JavaScript Compiler Write HTML, CSS, and JavaScript in separate editors and run your code whenever you choose. Manual compilation gives you full control over when the live preview refreshes. ### HTML, CSS & JS Editors Work with three dedicated code editors for: * HTML markup * CSS styles * JavaScript code Enjoy syntax highlighting, line numbers, and a clean coding experience designed for quick frontend development and testing. ### Live Preview Instantly see the result of your HTML, CSS, and JavaScript code in the built-in preview. Test layouts, styles, scripts, landing pages, components, and website ideas directly from your browser. ### Export Your Project Download your work as a **single portable `.html` file** and open it anywhere. This makes it easy to save, share, or continue working on your project later. ### Open Preview in a New Tab Need more space? Open your live preview in a **full browser tab** for a cleaner, larger view of your webpage. ### Autosave Your code is automatically saved locally and restored when you reopen the compiler, so you can continue your work without starting over. ### Import Design — Beta Use **Import Design** to capture the current webpage as an editable design reference. This feature is intended for inspiration, prototyping, and frontend experimentation. It does not guarantee a complete copy of a website. Protected, encrypted, dynamic, or restricted pages may not be fully captured, and imported code may require manual editing. We respect website privacy, permissions, and applicable Terms of Service. ### Privacy-Focused & Local Your code stays on your device. The extension does not collect or transmit your projects for analytics or telemetry. ## How to Use 1. Open the **HTML Compiler** extension. 2. Enter your HTML in the HTML editor. 3. Add styles in the CSS editor. 4. Add JavaScript in the JS editor. 5. Click **Run** or press **Ctrl+Enter** to compile and update the preview. 6. Export your project as an `.html` file or open the preview in a new browser tab. 7. Use **Import Design** when you want to capture a webpage as an editable reference. ## Perfect For The HTML Compiler is useful for: * Learning HTML, CSS, and JavaScript * Testing frontend code * Building quick website prototypes * Creating landing page experiments * Debugging small HTML/CSS/JS projects * Practicing web development * Testing JavaScript interactions * Creating standalone HTML files * Experimenting with website layouts and designs ## Explore More Free Web Development Tools Looking for more browser-based developer tools? Visit **[HTMLRunner.com](https://htmlrunner.com)** to explore free tools for web developers, including **Html Runner, HTML Editor, CSS Minifier, and other frontend utilities**. **Visit Htmlrunner:** https://htmlrunner.com Every visit helps support the continued development of free tools for web developers. ## Permissions The extension uses the following permissions: * **Storage** — saves your code locally and restores it when you return. * **Active Tab + Scripting** — used for Import Design only when you explicitly click the feature. * **Tabs + Host Permissions** — used to find and read the webpage you choose when you request an Import Design action. The extension does not continuously monitor your browsing activity. ## Privacy Your code is processed locally whenever possible, and the extension does not collect personal data or telemetry for analytics. Read the full privacy policy: **[Htmlrunner Privacy Policy](https://htmlrunner.com/privacy-policy/)** ## Why Use HTML Compiler? Get a lightweight **HTML, CSS, and JavaScript playground** directly in your browser. Whether you're learning web development, testing a code snippet, prototyping a webpage, or creating a standalone HTML file, the HTML Compiler gives you the essential tools without complicated setup. **Write. Run. Preview. Export.**