Free tool

HTML Code Tester

Test and preview HTML online, then publish to a live site

HTML

Paste your HTML here

⌘V/Ctrl V

or drop a .html file onto the editor

0 lines0 characters0 bytes

How to test HTML code online

  1. 1Paste your HTML into the editor, or click Upload to open a .html file from your computer.
  2. 2The live preview updates as you type. Switch between desktop, tablet, and phone viewports to check responsive layouts.
  3. 3Edit directly in the browser until the page looks right. The stats bar shows line, character, and byte counts.
  4. 4Click Publish to Upfling to put your page on a live URL. You can also download the file or copy the code.

Preview HTML across devices

Use the viewport toggles above the preview to switch between desktop, tablet (768px), and phone (375px) widths. The preview iframe resizes to match, so CSS media queries in your code respond exactly as they would on a real device.

Upload and test an HTML file

Drag and drop a .html or .htm file onto the editor, or click Upload and pick one from your file system. The file contents replace the editor, and the preview updates immediately. No server upload, no account needed.

FAQ

An HTML code tester lets you paste or upload HTML and see how it renders in a browser, without setting up a local server or deploying anything. This tool shows a live preview that updates as you edit, so you can iterate on your code and publish it when you are ready.

Ready?

Test and preview HTML online, then publish to a live site

Your code stays in your browser. Nothing is stored unless you publish.