Online HTML Viewer

A web-based HTML viewer that allows users to enter and view HTML code in real time. Perfect for testing and debugging HTML code, or for learning how different HTML elements and attributes are displayed in the browser.

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Online Html Viewer: Preview, Format, and Clean Up HTML Fast

HTML Viewer is a simple online tool that lets you view HTML output and format your code in one place. Just copy and paste your HTML, and you’ll instantly see a clean preview. It’s great for quick checks, fixing messy markup, and making sure your page looks right before you publish it.

An HTML Viewer works right in your browser. It shows your HTML code and the final layout, so you can spot problems, test changes, and edit with confidence—without installing anything.

HTML Viewer also helps you beautify HTML by adding proper spacing and indentation, giving you the best possible readable output. If you also work with structured data, you can clean XML in seconds using our XML Formatter.

What can you do with this HTML Viewer?

Preview HTML output to see how your page will look in a browser.
Format (beautify) HTML code to make it clean, readable, and well-indented.
Upload an HTML file to view and tidy up the code in seconds.
Save or share your HTML when you want to send it to a teammate or keep it for later.
Parse and indent HTML so it’s easier to debug and edit.
Use it on any device and browser—Windows, Mac, or Linux, and works smoothly on Chrome, Firefox, Edge, and Safari.

If you’re preparing a page for faster loading, reduce code size after formatting with our HTML Minifier. For scripts and styles, you can also compress files with the JS Minifier and CSS Minifier.

How to Preview HTML Code Online

Viewing HTML online is quick and simple with our HTML Viewer. You can paste code, upload a file, or load a page by URL—then preview the result instantly.

Open the HTML Viewer and click inside the input editor.
Paste your HTML code to see highlighted syntax and easier-to-spot mistakes.
If you have a file, click Upload File and select your .html file.
If your HTML is on a public page, click URL, paste the link, and load the code.
Click Run / View once your HTML is in the editor.
Your live HTML preview will appear in the output section.

Tip: If your HTML contains JSON (like schema markup or API data), open it in our JSON Viewer to read it clearly. You can also use the JSON Beautifier to format it with neat spacing and indentation.

How Does the HTML Viewer Work?

Our HTML Viewer uses JavaScript in your browser to read, format, and preview your HTML.

When you paste HTML, it is previewed right away in your browser.
For file uploads, your browser reads the file and shows the output—no manual steps needed.
For URL loading, the tool fetches the page HTML first, then displays it in the viewer so you can preview it.

It’s a fast, practical way to test layouts, check your HTML structure, and fix formatting before you publish.

Sample HTML File (Copy & Paste Example)

Want to see how the HTML Viewer works? Copy the code below, paste it into the input editor, then click Run / View to preview the result.

HTML Example (Luxury Car Price List):

 <!DOCTYPE html>
<html lang="en">
  <body>
    <h1>Most Expensive Cars in the World</h1>
    <ul>
      <li>Bugatti La Voiture Noire — $18.68 million</li>
      <li>Pagani Zonda HP Barchetta — $17.5 million</li>
      <li>Rolls-Royce Sweptail — $13 million</li>
      <li>Bugatti Centodieci — $9 million</li>
      <li>Lamborghini Veneno Roadster — $8.3 million</li>
    </ul>
  </body>
</html>

Tip: Use Beautify/Format to make the code cleaner and easier to read.

Frequently Asked Questions

What is an HTML viewer used for?

You can use this tool to quickly test small HTML, CSS, and JavaScript snippets in one place. It lets you preview how a page section looks right away, so you can spot layout issues fast. You can also compare how simple HTML might appear in different browsers by checking the preview (iframe). Need to check mobile and desktop views? Use the viewport size buttons to test basic responsiveness in seconds. It’s also great for learning, because you can change the code and instantly see what happens.

How are the responsive viewport sizes determined?

Responsive viewport sizes depend on three simple things: the viewport meta tag, the device’s screen width in CSS pixels, and your media query breakpoints. When you add , the browser sets the page width to match the device screen instead of using a fixed default like 980px. After that, your CSS media queries decide when the layout should change, based on the widths you define.

Is my HTML code stored on your servers?

No. Your HTML code is not saved on our server. The tool runs inside your browser, so the preview and rendering happen on your device. Your code is not sent to us and is not stored anywhere on our servers.

Is an HTML viewer free to use?

Yes, this online HTML Viewer is 100% free to use. No signup is needed—just paste your HTML and preview it instantly.