HTML Viewer & Formatter
Preview and pretty-print HTML code live in your browser. Rendering is fully sandboxed.
How it works & FAQ
Why this is secure?
HTML rendering happens entirely inside an isolated <iframe> sandbox with no access to cookies, storage, or your network. Nothing is sent to any server.
Step-by-Step Guide
- 1Paste or type your HTML code into the editor.
- 2Click Preview to see a live rendering of your HTML in the browser.
- 3Switch to Formatted to auto-indent and pretty-print your HTML.
- 4Copy the formatted output or share the preview directly.
Common Questions
What is an HTML viewer?
An HTML viewer (also called an HTML previewer, HTML renderer, or HTML displayer) lets you paste raw HTML and instantly see how it looks in a browser — no file creation or code editor needed.
Is this HTML viewer free?
Yes, completely free. No account, no download, no limits — paste your HTML and preview it instantly.
Can I use it to render HTML email templates?
Yes. Paste your HTML email template and click Preview to see exactly how it renders. The sandbox prevents scripts from running, making it safe to test untrusted HTML.
What is the difference between viewing and parsing HTML?
An HTML parser analyses the DOM structure of HTML code. This tool is an HTML renderer — it visually displays the output in a sandboxed window, which is better for checking how your HTML looks in a browser.
Does the HTML viewer work offline?
Once the page loads, all rendering and formatting happens locally in your browser. No internet connection is required to preview or format HTML.
Your HTML code never leaves your browser. No server requests are made when you paste, preview, or format HTML on this page.