HTML Viewer Cat_

paste html. see it rendered. thats it.

Editor

Preview

Free Online HTML Editor with Live Preview

HTML Viewer Cat is a free online HTML editor that lets you write HTML code and see it rendered instantly in a live preview. No signup, no downloads, no distractions — just paste your HTML and watch it come to life.

Features

Live preview that updates as you type
Syntax highlighting for HTML tags, attributes, and values
Responsive testing with phone, tablet, and desktop previews
Draggable split panes to adjust editor and preview sizes
Fullscreen preview mode
Works on mobile devices with a toggle between editor and preview

How to use

Type or paste HTML into the editor on the left. The preview on the right updates in real time. Drag the divider to resize the panels, or use the device icons to test how your HTML looks on different screen sizes. Your editor layout preference is saved automatically.

Built for developers

Whether you're learning HTML, prototyping a layout, debugging an email template, or just need a quick way to preview some markup, HTML Viewer Cat is designed to get out of your way and let you focus on code.