EasyConvert / Code & Developer Tools

HTML Viewer & Playground

Build and preview HTML, CSS, and JavaScript, then export a single file or project ZIP. Free browser-based tool with no signup required.

About HTML Viewer & Playground

Build and preview HTML, CSS, and JavaScript, then export a single file or project ZIP.

The tool is designed to process data in the browser unless the interface explicitly states that a network request is required.

How to use this tool

  1. Enter or select the html, css, javascript value you want to work with.
  2. Review the available settings, then run the preview action.
  3. Review the html preview, web page, single html file output and use the copy or download action when the tool provides one.

What you can do with HTML Viewer & Playground

  • View html output
  • Run html and css
  • Preview web page
  • Export html project

What this conversion does

Write HTML, CSS, and JavaScript in three editors, see the result rendered live in a sandboxed frame, and export a single HTML file or a ready-to-run project ZIP.

Example input

HTML: <h1>Hi</h1>, CSS: h1 { color: rebeccapurple }, JavaScript: document.title = 'Hi'

Example output

A live preview of the purple heading, plus an exported index.html with the CSS and JS inlined

Practical workflow

  1. Edit the HTML, CSS, and JavaScript tabs — a starter card with a working button is loaded for you.
  2. Keep Live preview on to render as you type, or turn it off and press Run when you are ready.
  3. Untick Allow JavaScript to render markup and styles only; use Focus preview or Fullscreen to inspect the page.
  4. Export a single standalone index.html, download markup.html / styles.css / script.js individually, or grab html-playground-project.zip with a README.

Common use cases

  • Prototype a component or landing-page section and hand the exported HTML to a teammate.
  • Test a snippet from a tutorial or Stack Overflow answer without setting up a local project.
  • Preview an HTML email or a fragment of generated markup before pasting it into a CMS.

Important notes and limitations

  • The preview runs in an iframe with sandbox="allow-scripts" and no same-origin access, so page scripts cannot reach this site, your cookies, or local storage.
  • No external libraries are injected. If your snippet needs a CDN script, add the <script> tag yourself in the HTML tab.
  • Your three sources are saved in the browser's local storage and restored on the next visit; Reset returns to the starter code.

Continue your workflow

Frequently asked questions

Can I run JavaScript in the preview?

Yes, when Allow JavaScript is checked. Scripts run inside a sandboxed iframe that has no access to this site. Uncheck it to render only HTML and CSS.

How do I get my work out of the playground?

Export a single index.html with the CSS and JS inlined, download the three files separately, or download the ZIP that links styles.css and script.js from index.html.

What if I paste a full document with <html> and <head> tags?

The tool detects it and injects your CSS into the existing head and your JavaScript before </body>, instead of wrapping the markup in its own template.

Will I lose my code if I close the tab?

No. The HTML, CSS, and JavaScript are stored in this browser's local storage and restored next time. Use Reset if you want the starter example back.

Focused guides for this tool

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