HTML Viewer

Write or paste HTML and see it rendered instantly in the browser.

Layout:Scripts are sandboxed and cannot run.

HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>
    body { font-family: sans-serif; padding: 16px; color: #1e293b; }
    h1 { color: #3b82f6; }
    button { background: #3b82f6; color: white; border: none; padding: 8px 16px; border-radius: 6px; cursor: pointer; }
    button:hover { background: #2563eb; }
  </style>
</head>
<body>
  <h1>HTML Viewer</h1>
  <p>Edit the HTML on the left to see it rendered here.</p>
  <button>Click me</button>
</body>
</html>

Preview

About This Tool

The HTML Viewer lets you write or paste HTML code and immediately see how it renders in a browser. The preview is displayed in a sandboxed iframe with scripts disabled, so you can safely preview HTML from untrusted sources.

The tool supports full HTML documents (with head, inline CSS, and style blocks) as well as HTML fragments. All processing happens locally in your browser.

How to Use

Type or paste your HTML into the code editor on the left.
Click Render to update the preview.
Switch to Stacked layout for a taller preview area.
Use Tab to indent lines in the editor.

Use Cases

Frontend developers test HTML snippets quickly. Email developers preview HTML email templates. Students learning HTML experiment with tags and see results instantly. Code reviewers verify rendered output visually.

FAQ

Why are scripts disabled? — The preview iframe uses sandbox="allow-same-origin" which blocks JavaScript execution. This lets you safely preview HTML from unknown sources.
Can I preview CSS? — Yes. Include style tags in your HTML or use inline styles. External stylesheets from other origins may be blocked by CSP.
Does it support full HTML documents? — Yes. You can paste a complete HTML document including DOCTYPE, head, and body tags.