HTML PREVIEW LAB

HTML Formatter

Clean up markup and see the rendered page immediately.

Format, minify, and preview HTML in a sandboxed renderer.

Start nowNo account required

Live

01Format

02Minify

03Sandbox preview

Tags

Comments

420

Text chars

588

Bytes

Input HTML

Processed Output

Indentspaces

<!doctype html>
<html>
  <head>
    <title>
      GoTools preview
    </title>
    <style>
      body { font-family: system-ui, sans-serif; margin: 32px; color: #172033; } .card { max-width: 520px; padding: 24px; border: 1px solid #d7dde8; border-radius: 12px; } .button { display: inline-block; margin-top: 12px; padding: 10px 14px; background: #10b981; color: white; border-radius: 8px; text-decoration: none; }
    </style>
  </head>
  <body>
    <main class="card">
      <h1>
        HTML Formatter
      </h1>
      <p>
        Paste HTML, format it, then preview the rendered result safely.
      </p>
      <a class="button" href="#">
        Preview link
      </a>
    </main>
  </body>
</html>

HTML Formatter and Renderer Help, Examples, and FAQ

Usage Guide

Use the HTML formatter to clean page fragments, email templates, CMS content, component output, and markup copied during debugging. Paste HTML into the input area, then format it into an indented structure or minify it into a compact version for temporary publishing or embedding. The preview panel renders the current content in a sandboxed iframe so you can inspect both structure and visual output. Formatting does not repair semantic issues automatically, so layout bugs still require checking tag closure, nesting, selectors, and external asset paths.

Examples

Paste minified markup from browser developer tools and inspect containers, headings, buttons, and form hierarchy.
Edit an email template or rich-text fragment, then confirm the basic layout in the sandbox preview.
Minify a static HTML snippet before publishing, and switch back to formatted output when debugging.

FAQ

Does the preview run scripts? No. The preview uses a sandboxed iframe without script permission.
Does formatting guarantee valid HTML? No. It improves readability but cannot guarantee semantic correctness, CSS behavior, or asset paths.
Is my input uploaded? Formatting, minifying, and previewing run locally in your browser.

HTML Formatter

HTML Formatter and Renderer Help, Examples, and FAQ

Usage Guide

Examples

FAQ

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