About HTML Viewer Pro

HTML Viewer Pro is a fast HTML editor and formatter with an instant live preview. View, edit, format, minify, validate, and export your HTML in real time.

You can see the live preview on the same page in the panel next to the editor. You can also open the preview in a new tab using the Preview tab button, which is often more stable for testing interactive pages.

The editor highlights your HTML for better readability using the high-performance editor Ace (license).

The Format function beautifies your HTML using an efficient third-party library: JS Beautifier (license).

Available functions

• Format — beautifies the HTML in the editor.
• Minify — removes unnecessary whitespace from the HTML.
• Validate — checks the HTML for common structural issues.
• Diff — compares the current HTML against a saved snapshot.
• Sample — loads a sample HTML page into the editor.
• Clear — erases the editor text.
• Copy — copies the editor content to the clipboard.
• Import — opens an .html or .htm file from your device.
• Export — downloads the current HTML as a file.
• Preview tab — renders the HTML in a new browser tab.
• Dark mode — switches between light and dark editor themes.
• Fullscreen — expands the editor workspace to fill the screen.

This website may use cookies for traffic measurement and, when enabled, for serving ads. You can accept or reject non-essential cookies using the banner on your first visit, or change your choice anytime via the Cookies link. See our Privacy Policy for details.

All HTML you type or paste is processed locally in your browser (not on a server). Your code is not uploaded for editing, formatting, or preview. It is private and safe on your device.

Third-party libraries used

• Ace Editor (license) — code editor and syntax highlighting
• JS Beautifier (license) — HTML formatting
• Lucide Icons (license) — toolbar and UI icons

If you have any suggestions or licensing questions, please contact us at support@htmlviewerpro.com.

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