HTML Editor
Free online HTML editor with HTML, CSS and JavaScript tabs and a live preview that updates as you type. Prototype pages, test snippets, learn HTML, or build an email template — everything runs in your browser. No sign-up, no upload, unlimited.
💻 What This Tool Does
A lightweight online HTML editor with three tabs — HTML, CSS, and JavaScript — and a sandboxed preview iframe that updates instantly as you type. Write code in any of the three tabs and see the result rendered in real time. When you're happy, copy the combined HTML or download it as a single, self-contained .html file.
Everything runs 100% in your browser. No sign-up, no server, no code sent anywhere. Your work lives only in the current tab — close it and it's gone. Nothing is tracked or stored.
⚡ How to Use
- Pick a tab — HTML, CSS, or JS — and start typing
- Watch the preview update on the right as you type (debounced 300ms for smooth performance)
- Load an example — click Hello World, Click Counter, Card, or Contact Form to see how it all fits together
- Copy or download — get a single self-contained .html file with your CSS inlined in a <style> tag and JS in a <script> tag
🎯 Use Cases
🧪 Quick prototyping
Test a component idea or CSS trick without spinning up a dev server. Paste, tweak, done.
📚 Learning HTML & CSS
Beginners can see exactly how HTML tags and CSS properties affect the page, in real time.
📧 Email templates
Draft an HTML email in the editor and preview it before pasting into your email service.
📝 Bug reproductions
Isolate a bug in a minimal HTML/CSS/JS snippet, then download the .html and share the file.
🔒 Privacy & Sandbox
- ✓ Runs entirely in your browser — no server processing
- ✓ Your code is never sent, stored, or logged
- ✓ Preview runs in a sandboxed iframe (
allow-scriptsonly, no same-origin access) - ✓ Your code cannot access this page's cookies, localStorage, or data
- ✓ Works offline after the page loads
❓ Frequently Asked Questions
What is this HTML editor?
A free online HTML editor with three tabs — HTML, CSS, and JavaScript — and a live preview pane that updates instantly as you type. It runs entirely in your browser, so you can prototype web pages, test snippets, or learn HTML without any setup.
Is my code private?
Yes. Everything runs locally in your browser. Your HTML, CSS, and JavaScript are never sent to any server. Close the tab and everything is gone — nothing is stored, logged, or transmitted.
Can I download my work?
Yes. Click the "Download .html" button to save everything as a single self-contained .html file — the HTML, CSS (inlined in a <style> tag), and JavaScript (inlined in a <script> tag) are all bundled together. Open the file in any browser and it works offline.
Is JavaScript sandboxed?
Yes. The preview runs inside a sandboxed iframe with the "allow-scripts" flag but without "allow-same-origin". This means your code can use JavaScript, DOM APIs, and fetch, but it cannot access this page's cookies, localStorage, or data. It is isolated for your safety.
Can I use external libraries like React or jQuery?
Yes. Add a <script src="https://..."> tag in the HTML tab pointing to any CDN (unpkg, jsdelivr, cdnjs). For example, load jQuery with <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script> and then use it in your JS tab.
How is this different from CodePen or JSFiddle?
This is a lightweight, free alternative. No sign-up, no accounts, no history, no social features — just an editor and preview. If you need collaboration, versioning, or sharing features, use CodePen. If you just want to write and preview HTML quickly without any friction, this is faster.