HTML Preview
Preview HTML in real-time with split view, inline CSS and JavaScript support. Edit code on the left, see rendered output on the right. Free online HTML previewer.
Why Use an HTML Preview Tool?
Writing HTML can be tedious without instant feedback. Our HTML Preview tool gives you a real-time split-view editor — type code on the left and see the rendered output on the right instantly. It supports inline CSS, basic JavaScript, and lets you export your work as a complete HTML file.
Key Features
- Real-time split view: code editor on left, rendered preview on right
- Full inline CSS and basic JavaScript support via sandboxed iframe
- Copy formatted HTML or export as .html file
- Pre-loaded sample HTML template to get started quickly
- 100% client-side — your code never leaves your browser
How It Works
- Write or paste HTML in the left editor panel
- See the rendered preview update in real-time on the right
- Copy the HTML code or export as a complete .html file
- Your content is rendered safely in a sandboxed iframe
Technical Details
This tool uses an iframe with the srcdoc attribute for safe HTML rendering. The sandbox attribute is set to allow-scripts, enabling JavaScript execution while preventing top-level navigation, form submissions, and same-origin access. This provides a secure preview environment.
Frequently Asked Questions
Can I use JavaScript in my HTML?
Yes! The preview uses a sandboxed iframe with script execution enabled. You can include inline JavaScript, button click handlers, and basic DOM manipulation. For security, some features like popups are restricted.
Is my HTML code sent to any server?
No. All rendering happens entirely in your browser using an iframe with srcdoc. Your HTML code is never transmitted to any server.
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