What This HTML Viewer Does
This HTML viewer runs in your browser. You paste markup and see the result in the preview panel. No uploads and no account. You fix or tweak code and the preview updates as you type.
Use it to check how a page will look before you publish. Or to debug a snippet. Or to try out structure and tags without touching your real project. The editor runs JavaScript, so scripts inside your HTML run in the preview.
Hierarchical nesting
HTML, CSS, JavaScript
Structure elements
External CSS and Scripts: One Limitation
Inline CSS and inline scripts work in the preview. External files are different.
When your HTML uses <link> or <script src="..."> pointing to another domain, the browser applies CORS (Cross-Origin Resource Sharing). If the server does not allow cross-origin requests, the stylesheet or script will not load in the preview. You will see the HTML and any inline code, but not the external resources. For full control over layout and behavior in this viewer, prefer inline styles and scripts or use a URL that allows cross-origin access.
Good markup uses a clear tree: <html>, <head>, <body>. Inside the body, semantic tags like <header>, <main>, <article>, and <footer> describe the page. Screen readers and search engines rely on this structure. If your output looks wrong in the viewer, check nesting and missing closing tags first.
Mistakes That Break Layout or Readability
When you inspect your code here, watch for these:
- Unclosed tags. Every
<div>,<ul>,<p>needs a matching closing tag. Browsers guess when a tag is missing and often get it wrong. - Wrong nesting. Close the last opened tag first. Overlapping tags lead to odd styling and broken structure.
- Too many
<div>wrappers. Use<article>,<section>,<nav>where they fit. Semantic tags make the page easier to maintain and to parse. - Heavy inline style. A little inline CSS is fine. Large blocks of
style="..."are hard to change. Prefer a small inline block or link to styles when you need to tweak layout often.
After you are happy with structure, you might run the same HTML through an HTML Beautifier for consistent indentation, or an HTML Minifier for smaller file size. For safe embedding of special characters, use an HTML Encoder.
Using the Tool
Paste your HTML into the left panel. The right panel shows the live preview and updates as you edit. Use the copy button to grab the code. Use the clear button to start over. Share links are available if you want to send the current snippet to someone else. All of this runs in your browser. Your code is not sent to our servers.
