HTML
Preview

Why Use It?

  • Preview HTML snippets without saving a file
  • Test email or newsletter markup quickly
  • Render scraped or exported HTML safely
  • Debug layout and inline styles instantly
  • Share rendered output via Open in New Tab

What's Supported

  • Full HTML documents or fragments
  • Inline and embedded <style> CSS
  • Embedded <script> (sandboxed)
  • Tables, forms, images, and SVG
  • Drag-and-drop or upload of .html files

Privacy & Speed

  • 100% client-side rendering
  • Preview runs in a sandboxed iframe
  • No sign-up, no tracking, no uploads
  • Instant preview as you type
  • Free for any use, including commercial

About the HTML Viewer

The HTML Viewer is a side-by-side editor and live preview tool that renders your HTML code into a real, visual web page in real time. The interface is split into two equal panels: an HTML source editor on the left and a live rendered preview on the right. As you type, paste, or drop a file, the preview updates instantly so you can see exactly how your markup will look in a browser.

The preview is rendered inside a sandboxed iframe, which isolates the page's styles and scripts from the rest of the site and contains anything your HTML does. That means you can safely render full HTML documents, complete with <style> blocks, inline CSS, embedded JavaScript, forms, tables, images, and SVG. Everything runs in your browser — your code is never uploaded, logged, or stored.

How to Use the HTML Viewer

  1. Paste or type your HTML into the HTML panel on the left, or drag a .html file onto it. The Preview panel on the right updates automatically.
  2. Click Upload .html to load a file from your device, Sample to load an example page, or Clear to start with a blank editor.
  3. Use Copy HTML to copy your source to the clipboard, or Download .html to save it as a file.
  4. Click Open in New Tab to view the rendered page full-screen in its own browser tab.
  5. Use the 100% buttons on each panel to focus on just the code or just the preview, or Fullscreen for a distraction-free editing experience.

Common Use Cases

  • Snippet previews — quickly see how a piece of HTML and CSS renders without spinning up a project.
  • Email template testing — preview newsletter or transactional email markup with inline styles.
  • Learning HTML & CSS — experiment with tags and styles and see the result immediately.
  • Inspecting exported HTML — render HTML copied from a CMS, scraper, or AI tool to verify it.
  • Debugging layouts — isolate a component and tweak its markup until it looks right.
  • Sharing demos — render a page and use Open in New Tab to show it to a teammate.
  • Quick mockups — prototype a static page in seconds, then download the file.

Frequently Asked Questions

Is my HTML sent to a server?

No. Rendering happens entirely in your browser inside a local iframe. Your code is never transmitted, logged, or stored, so it's safe to paste private templates, internal pages, or unpublished drafts.

Does it run embedded JavaScript?

Yes. Scripts run inside a sandboxed iframe with limited permissions (allow-scripts, allow-forms, allow-popups). The sandbox isolates the frame so scripts cannot access this page or your other tabs.

Can I render just a fragment of HTML?

Yes. You can paste a full document with <!DOCTYPE html> or just a fragment like a single <div>. The browser renders both correctly.

Will external images and stylesheets load?

Yes, as long as the resource URLs are publicly accessible and allow cross-origin loading. Relative paths won't resolve because the preview has no base URL, so use absolute https:// links for external assets.

Can I upload an HTML file?

Yes. Click Upload .html to pick a file, or drag and drop a .html file directly onto the editor. The file is read locally and loaded into the editor.

How do I view the page full-size?

Click Open in New Tab to render the HTML in its own browser tab, or use the 100% button on the Preview panel to expand it within the tool.

Is it free for commercial use?

Yes. The HTML Viewer is free for any purpose — personal, educational, or commercial. Since nothing leaves your device, there are no data-handling concerns for proprietary content.

Working with other formats? Try the Markdown Viewer, JSON Viewer, or the JavaScript Tester.