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HTML Viewer (Online HTML Editor)

Paste HTML, CSS and JavaScript and see it rendered instantly in a secure sandbox.

Runs instantly in your browser — results update as you type.

What is an HTML viewer?

An HTML viewer renders HTML code as a web page so you can see what it looks like without creating a file or uploading it to a server.

How to use it

  1. Paste or type HTML — you can include <style> and <script> blocks.
  2. The preview updates as you type.
  3. Tick "Run JavaScript" to execute scripts.

Safe by design

The preview runs in a sandboxed iframe with no access to this site, your cookies, storage or other tabs. Even with JavaScript enabled, code cannot read anything outside the preview.

Great for testing email templates, embed codes, snippets from tutorials and HTML exported from other tools. Tidy the code with the HTML Beautifier.

Frequently asked questions

Can I load external CSS or images?

Yes, absolute URLs to stylesheets, images and fonts load normally in the preview.

Why does my script not run?

JavaScript is off by default; tick "Run JavaScript in the preview".

Is my code saved?

No, nothing is stored or uploaded.