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DEVELOPER UTILITY

HTML Editor & Live Preview

Write HTML with line numbers and see the rendered output update in real time

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HTML Code

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What is HTML?

HTML (HyperText Markup Language) is the standard language for creating web pages. It describes the structure of a page using elements represented by tags — such as <h1> for headings, <p> for paragraphs, and <a> for links. Browsers read HTML and render it as the visual web pages you interact with every day.

HTML works together with CSS (for styling and layout) and JavaScript (for interactivity). A complete HTML document includes a <head> section for metadata and a <body> section for visible content.

How to Use This HTML Editor

  1. Type or paste HTML in the code editor. The live preview updates automatically as you type.
  2. Click Format to beautify your HTML with proper indentation.
  3. Import an .html file from your computer, or Export the editor contents as a file.
  4. Use Preview in New Tab to see the full-page rendering in a separate browser tab.
  5. On mobile, use the Code / Preview tabs to switch between the editor and the rendered output.

Common Use Cases

  • Prototyping: Quickly sketch out a page layout or component without setting up a full dev environment.
  • Email templates: Write and preview HTML email templates with inline CSS before sending.
  • Learning: Experiment with HTML tags, CSS properties, and JavaScript events in a safe sandbox.
  • Debugging: Paste HTML from an API response or CMS output to inspect how it renders.
  • Sharing: Use the Share button to create a link that includes your HTML, so others can view and edit it.

Security & Privacy

All processing happens entirely in your browser — your HTML is never sent to any server. The live preview uses a sandboxed iframe with restricted permissions, preventing the preview from navigating the parent page, submitting forms to external servers, or accessing cookies.

JavaScript in the preview runs in isolation. The sandbox allows allow-scripts so interactive elements work, but blocks all other capabilities like allow-same-origin, allow-forms, and allow-top-navigation.