About The HTML Editor and Preview

This free online HTML Editor lets you write, paste, and preview HTML directly in your browser. It is useful for quick markup tests, small layout experiments, email snippets, teaching examples, and copied HTML fragments that need a fast visual check.

The editor adds lightweight syntax highlighting while keeping the real input editable. Preview output is rendered in an isolated iframe, so you can inspect how the HTML displays without leaving the page.

How to Preview HTML Online

1. Paste or type your markup into HTML input.
2. Click Render Preview to display the result in the preview panel.
3. Use Load sample when you want a quick starting example.
4. Use Copy HTML when you need to reuse the current markup elsewhere.

Choosing Options Correctly

Script execution:
- Leave it OFF for normal HTML and CSS previews. This is the safer default.
- Turn it ON only when your snippet needs JavaScript to render or behave correctly.
- Preview links are isolated so pasted links do not navigate the main tool page.

Preview behavior:
- The preview shows the HTML and CSS you provide, including any background, spacing, fonts, and colors in the snippet.
- In dark theme, unstyled previews use a dark-friendly default, but styles inside your HTML still take priority.

Common Use Cases

• Test a small HTML component before adding it to a project.
• Preview email-template fragments, table layouts, or inline CSS snippets.
• Check how copied markup renders before cleaning or reusing it.
• Practice HTML structure while seeing the rendered output immediately.

Quick FAQ

Is my HTML uploaded or stored?
No. The editor and preview are designed to run in the browser.

Why does my preview look white in dark theme?
The preview is isolated so your HTML renders closer to a normal page instead of inheriting the app theme.

Why is my JavaScript not running?
Script execution is intentionally limited for safety. Use a local development environment for interactive scripts.

Can this validate HTML errors?
No. It is an editor and preview, not a complete HTML validator or browser compatibility tester.