HTML Viewer

Preview and edit HTML code directly in your browser with a live-rendered preview...

SecureFastFree

Updated

Drag & Drop or Click to Upload

Supports .html and .htm files

or

HTML Viewer Features

Edit, preview, and inspect HTML

Live HTML preview
Split editor + preview
Device frame previews
Draggable resize handle
Format / pretty-print HTML
Minify HTML
Dark mode preview toggle
Console output capture
Element statistics
Fullscreen mode
Download .html file
Copy source to clipboard

Why Use HTML Viewer?

Instant Live Preview

See your HTML rendered in real time as you type. Changes appear instantly in the sandboxed preview pane without refreshing.

Responsive Device Frames

Preview your HTML on Desktop, Tablet (768px), and Mobile (375px) screen sizes with realistic browser-style device frames.

Source Editor with Line Numbers

Edit HTML in a dark-themed code editor with line numbers, syntax-friendly monospace font, and keyboard shortcuts.

Built-in Console Output

Capture console.log, console.error, and console.warn messages from your HTML scripts displayed right below the preview.

Common Use Cases

Why preview HTML online

Quick HTML Prototyping

Rapidly prototype HTML layouts and components with instant visual feedback. Perfect for testing snippets before integrating into a project.

Responsive Design Testing

Check how your HTML renders across Desktop, Tablet, and Mobile sizes without deploying. Catch layout issues early.

Learning HTML & CSS

Students and beginners can experiment with HTML and see results instantly. Great for tutorials and code-along exercises.

Email Template Preview

Preview HTML email templates to verify layout, styling, and links before sending. Test across different viewport widths.

How It Works

1

Load Your HTML

Drag and drop an .html file, paste HTML code into the editor, or click 'Sample HTML' to load a demo page.

2

Edit and Preview

Use the split view to edit HTML on the left while seeing live-rendered output on the right. Toggle between view modes as needed.

3

Test Responsiveness

Switch between Desktop, Tablet, and Mobile device frames to see how your HTML looks at different screen sizes.

4

Export or Share

Download the HTML as a file, copy the source code to clipboard, or use Format/Minify to clean up the code.

Pro Tips for HTML Viewing

Use Split View

Split view lets you edit and preview simultaneously. Use horizontal split on wide screens and vertical split on narrow ones.

Go Fullscreen

Click the fullscreen button to maximize the editor and preview area, removing page chrome for a focused editing experience.

Format Before Sharing

Use the Format button to pretty-print messy or minified HTML before sharing with teammates or saving for documentation.

Check Console Output

If your HTML has JavaScript, check the console panel for errors. It captures log, warn, and error messages from the iframe.

Frequently Asked Questions

Yes. All processing happens entirely in your browser. Your HTML code is never uploaded to any server. It stays on your device at all times.
Yes. The preview runs in a sandboxed iframe with 'allow-scripts' enabled. Your JavaScript will execute and console output is captured and displayed.
You can upload .html and .htm files. You can also paste raw HTML code directly into the editor textarea.
Choose Desktop (full width), Tablet (768px), or Mobile (375px) to constrain the preview iframe width. You can also drag the resize handle to set a custom width.
Format HTML pretty-prints your code with proper indentation based on tag nesting. It makes minified or messy HTML readable and well-structured.
Minify removes unnecessary whitespace, line breaks, and indentation from your HTML to reduce file size. Useful before deploying to production.
Yes. The dark mode toggle changes the preview iframe background to dark, making it easier to test how your page looks against a dark backdrop.
We inject a small script into the iframe that intercepts console.log, console.error, and console.warn calls. Messages are sent back to the parent page via postMessage.
Yes. The stats bar shows the total number of HTML elements, unique tags, images, links, scripts, and stylesheets found in your code.
There is no hard limit since processing is client-side. However, very large HTML files (10MB+) may slow down the live preview. For best performance, keep files under 5MB.

Trusted by Millions

SSL Secured
256-bit Encryption
Cloud Processing
Mobile Friendly
Works Everywhere
Free Forever

“Super fast and easy to use!”

Sarah M.

“Best free PDF tool online”

John D.

“Saves me hours every week”

Mike R.

50M+

Files Processed

2M+

Happy Users

4.9

Star Rating

99.9%

Uptime

Related Tools

HTML to PDF

Convert HTML to PDF

HTML to Markdown

Convert HTML to Markdown

Code Formatter

Format source code

CSS Minifier

Minify CSS code