HTML Previewer
Preview HTML snippets in a sandboxed browser frame.
HTML Previewer
Preview HTML snippets in a sandboxed iframe while editing markup, inline CSS, and small examples. Use it for docs, CMS snippets, and quick UI experiments.
Preview behavior
- The preview uses an iframe sandbox
- Inline CSS is rendered with the markup
- Formatting uses the open-source js-beautify package
How to use HTML Previewer
The HTML previewer renders HTML snippets in a sandboxed iframe so you can inspect markup and inline styles without opening a separate file.
Developers often use this page when they need html previewer, html preview online, html viewer, and preview html code.
Privacy and data handling
This previewer renders your HTML in a sandboxed browser frame for normal use.
- Normal use does not require uploading your snippet to a server.
- Scripts are blocked in the preview sandbox.
- Avoid pasting private customer content or secrets into shared devices.
Examples
Preview a small HTML snippet
Input
<h1>Hello</h1><p>Preview this snippet.</p>Output
Rendered heading and paragraph inside a sandboxed preview frame.Scripts are blocked in the sandbox, so this is best for markup and inline CSS checks.
Steps
- 1Paste or edit an HTML snippet.
- 2Click Preview to refresh the sandbox frame.
- 3Format or copy the HTML when needed.
Common use cases
- Preview docs and CMS snippets.
- Test small HTML and CSS examples.
- Check markup before pasting it into another tool.
Practical tips
- Scripts are blocked in the preview sandbox.
- Inline CSS is useful for quick visual checks.
- Use the formatter before sharing a snippet.
FAQ
Can the preview run JavaScript?
No. The iframe sandbox blocks scripts so previewing snippets is safer and more predictable.
Is this a full browser testing tool?
No. It is for quick snippet previews, not full cross-browser testing.