Free HTML tool

HTML and CSS viewer, online.

Paste your markup and your styles and see the page render live, instantly, with no signup. When it looks right, publish it as a real shareable link in one click.

Live HTML preview

01 A viewer, a tester, and a publish button

  • See it live: paste HTML and the preview updates as you type, no build step.
  • Real rendering: your CSS and JavaScript run in a sandboxed frame, so you test the true result.
  • Ship it: happy with it? Publish to a live yourname.yapp.page link in about two seconds.
  • Free and private: nothing is uploaded while you edit; publishing is optional and free to try.

02 Viewing HTML together with its CSS

The preview renders your styles, not only your markup, so you see the real layout instead of a wall of unstyled text.

  • A <style> block in the head renders exactly as it would on a live page.
  • Inline style attributes apply as well.
  • A <link> to a stylesheet on another domain will not load here. This page blocks outside style sources on purpose. Paste that CSS into a <style> block to preview it, or publish the page and open the live URL, where your own origin has no such restriction.
  • A relative path such as css/style.css has nothing to resolve against in a preview pane. Publish the folder, or a ZIP containing index.html, and the paths work as written.

Sending the result to somebody? Share it as a link rather than as a file, or the CSS goes missing at the other end.

03 How to test HTML code online

1

Paste your HTML

Drop your markup into the editor on the left. Inline CSS and JavaScript are welcome, and the preview renders instantly on the right.

2

Check the result

The preview runs in a sandbox, so scripts execute and you see exactly what a visitor would. Tweak until it looks right.

3

Publish it live

Click Publish to turn your tested HTML into a real, shareable link with a clean preview and a QR code.

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Built it with AI? Connect yapp.page to ChatGPT or Claude and just say "publish this HTML." Set it up →

04 Frequently asked questions

How do I test HTML code online?

Paste your HTML into the editor above and it renders live in the preview beside it, instantly, with no signup. Your JavaScript and CSS run too, so you test the real result.

Is this HTML viewer free?

Yes, the viewer and tester are free with no account required, and publishing the result as a live page is free to try, no credit card.

Can I turn my tested HTML into a real live link?

Yes. When it looks right, click Publish and yapp.page hosts it at a live URL in about two seconds. Sign in (free) to keep the page for 30 days.

Does the preview run JavaScript?

Yes, in a sandboxed frame, so your scripts execute and you see the true output while your browser and this site stay protected.

Can I view HTML and CSS together online?

Yes. Put your CSS in a <style> block inside the HTML you paste and the preview renders the styled page, exactly as a browser would.

Why is my external stylesheet not loading in the viewer?

This page blocks stylesheets from other domains on purpose, so a <link> pointing at a CDN stays unstyled here. Paste that CSS inline to preview it, or publish the page and open the live URL, which carries no such restriction.

Can I test a full HTML file with images and CSS?

You can test any self-contained HTML here. For a full site with separate files, publish it on yapp.page by dropping the folder or a ZIP that contains index.html.

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