HTML Viewer

Preview HTML code rendered in a sandboxed frame.

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>{t('title')}</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 without risk.

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 use this to quickly test HTML snippets without creating a local file. Email developers preview HTML email templates before sending. Students learning HTML experiment with tags and attributes and see results instantly. Code reviewers paste HTML from pull requests to verify the rendered output visually.

FAQ

Why are scripts disabled? — The preview iframe uses the sandbox="allow-same-origin" attribute, which blocks JavaScript execution for safety. This lets you preview HTML from unknown sources without risk.
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.