Free HTML tool

HTML viewer and tester.

Paste your HTML and see it 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 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 →

03 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 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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