Online HTML Editor

What is an online HTML editor?

An online HTML editor provides a browser-based code area and live preview so you can write HTML and CSS and immediately observe layout and style changes. It includes find and replace, source copying, HTML download, preview height controls, and a safe static mode. Scripts can optionally run inside an isolated iframe for debugging. It is useful for learning HTML, prototyping pages, reviewing snippets, and quick demos.

How to use the online HTML editor

1. Type or paste HTML and CSS into the source editor, then refresh or enable live preview.
2. Use Find and Replace to update repeated tags, class names, text, or attributes with optional case sensitivity.
3. Safe static mode removes scripts, iframes, objects, and event attributes. Enable scripts only when the code is trusted and needs them.
4. Copy the source or download edited.html, then verify it in the real target browser and project before publishing.

Key benefits of the online HTML editor

• Synchronized editing and preview

  Changes can refresh the preview with a short delay to reduce typing interruptions, while a fixed height helps inspect page content.

• Built-in find and replace

  Replace class names, text fragments, or attribute values without leaving the tool, with a visible match count.

• Isolated safe preview

  The preview runs in a sandboxed iframe and removes scripts, nested iframes, objects, and event attributes by default so source cannot affect the tool UI.

• Local copy and download

  Source is processed in the browser and can be copied into a project or downloaded as edited.html.

Online HTML editor frequently asked questions