About the Online HTML Viewer
Write or paste HTML and CSS and see the rendered result alongside the source. The browser-based viewer includes syntax highlighting, undo and redo, configurable layouts, line numbers and a full-screen preview.
What you can do
- Live HTML and CSS preview
- Syntax highlighting with optional line numbers
- Undo, redo, resizable panels and multiple layouts
- Sanitized preview that removes scripts and unsafe attributes
How to use it
- Replace the starter markup with your HTML and CSS.
- Watch the preview update while you edit.
- Adjust the layout, open a full-screen preview or copy the finished code.
Frequently asked questions
Can I preview HTML and CSS together?
Yes. Add CSS inside a style element in the editor and the preview will render it with the HTML.
Does the HTML viewer run JavaScript?
No. The preview removes scripts, embedded frames, unsafe event attributes and JavaScript URLs before rendering.
Can I change the editor layout?
Yes. You can place the code canvas on the left, right, top or bottom and resize the panels on supported screens.