An HTML Online Editor is a web-based tool that lets you write, edit, and preview HTML (and often CSS/JavaScript) code directly in your browser—without installing any software. Many include live previews so you can instantly see how your code looks.
You use it to:
Quickly test and visualize HTML code changes.
Avoid setting up a development environment.
Learn HTML interactively or share code snippets easily.
Build and preview web elements or full pages in real-time.
You use it by:
Going to a website that offers the tool (e.g., CodePen, JSFiddle, JSBin, W3Schools).
Typing or pasting your HTML code into the editor.
Viewing the instant live preview of your webpage or component.
Optionally exporting or saving your work.
Use it when:
You need a quick HTML sandbox to experiment or debug code.
You're learning or teaching HTML/CSS/JS.
Collaborating or sharing code without sending files.
You want to build lightweight prototypes or mockups.