Build, inspect, and refine HTML instantly.

Use the editor and sandboxed preview side by side, then test the same markup across common viewport sizes without leaving the page.

Ready for HTML

HTML Editor

Live Preview

Full width

Features

Purpose-built controls for fast HTML testing, clean code, and quick iteration from any modern browser.

Instant preview and testing

Render HTML in a sandboxed preview and switch between full, desktop, tablet, and mobile widths.

Easy file handling

Paste snippets, upload local HTML files, or download your current work as a ready-to-open document.

Beautify and minify

Clean up messy markup with readable indentation or compress it for compact sharing and storage.

Browser-native workflow

No install step, account, or framework is required. Everything runs locally in the page you opened.

How It Works

A simple loop for testing markup, checking responsive behavior, and keeping your HTML tidy.

Paste or type code

Add a full document or a focused HTML snippet directly in the editor.

Click Preview

Render your current markup inside the isolated preview pane.

Switch device sizes

Use the device toolbar to see how the same HTML behaves at common breakpoints.

Download or refine

Beautify, minify, download, or keep editing until the result is ready.

Tips

Small habits that make HTML snippets easier to debug, review, and move into production code.

Debug with the preview

Run after small edits so visual regressions are easier to spot.
Check for missing closing tags, broken nesting, and unescaped characters.
Use your browser developer tools on the iframe when layout issues need deeper inspection.

Format before review

Readable indentation exposes hierarchy and makes misplaced elements obvious.
Keep related attributes together so links, classes, and accessibility labels are easy to scan.
Minify only when you need compact output, not while you are actively debugging.

Test snippets safely

Try new snippets here before adding them to real sites or templates.
Avoid pasting sensitive tokens, private content, or production secrets into any test markup.
Validate behavior at multiple widths before reusing layout-heavy code.

FAQ

Quick answers for common questions about using HTML Viewer Pro.

Is HTML Viewer Pro free to use?

Yes. This single-file tool is free to open, use, and customize for your own workflow.

Do I need to install anything?

No. Open the HTML file in a modern browser and the editor, preview, formatter, and file tools are ready.

Can I use it on mobile?

Yes. The editor and preview stack vertically on smaller screens, and the interface adapts to touch-friendly layouts.

Is my HTML code stored anywhere?

No. Your code stays in your browser session unless you download it or save the page state yourself.

What types of HTML snippets work best?

Full HTML documents, component snippets, email prototypes, semantic layout tests, and small CSS or script experiments all work well.

Axvoid Service Information

Contact, privacy, and usage details for adding HTML Viewer Pro to the services available through Axvoid.com.

Contact HTML Viewer Pro on Axvoid.com

Use this section as the in-page contact surface for support, feature requests, and service feedback related to HTML Viewer Pro.

Best ways to reach the service team

For general support, describe the browser, device, and the HTML snippet behavior you expected.
For privacy requests, include the service name and the exact request type so the Axvoid team can route it correctly.
For partnership or integration questions, mention Axvoid.com and the intended service placement.