About HTML Viewer Online
HTML Viewer Online is a free tool for viewing, editing, beautifying, minifying, and validating HTML code right in your browser. No data ever leaves your machine - everything runs client-side.
What it does
Paste or upload HTML, add CSS and JavaScript in separate tabs, and see a live rendered preview. Use the Beautify button to clean up messy code, Minify to shrink file size, and Validate to check for common tag errors.
Who made it
Built by Jimmy at CodeBeautify. If you have questions or suggestions, reach out through the CodeBeautify site.
Key features
- Three-panel editing - HTML, CSS, and JavaScript tabs
- Live preview with auto-update toggle
- One-click beautify and minify
- HTML validation with line-level error reporting
- Responsive device preview (desktop, tablet, mobile)
- Split, stacked, or preview-only layout
- Dark and light theme
- Copy, download, and open-in-new-window
- Local storage saves your work