When you need an HTML viewer
An HTML viewer renders raw markup as a visual page — useful when you need a quick preview without creating a file:
- Email template preview — paste an HTML email and see how the layout renders before sending a test.
- CMS output inspection — check what a WYSIWYG editor actually generated under the hood.
- Code snippet testing — render a snippet from Stack Overflow or documentation to see if it does what you expect.
- Debugging — paste the HTML source of a broken page to isolate the rendering issue.
- Learning HTML — write markup and see the result instantly without any local setup.
Safety: how script removal works
Rendering arbitrary HTML in a browser can be dangerous. This viewer applies two safety measures before rendering:
- Script tag removal — all
<script>elements are stripped, preventing JavaScript execution. - Event handler removal — inline event attributes like
onclick,onload, andonerrorare removed from all elements.
CSS styles, images (via inline style attributes), and all standard HTML elements are preserved in the preview.
Preview vs Source view
The viewer offers two modes:
- Preview — renders the sanitized HTML as a visual page. This is what the markup looks like in a browser.
- Source — shows the sanitized HTML as text. Useful for seeing exactly what was changed by the sanitizer (e.g., which scripts were removed).
Related HTML tools on CodeBoxTools
- HTML Beautifier — format and indent HTML code.
- HTML Minifier — compress HTML by removing whitespace and comments.
- HTML Encode/Decode — convert special characters to HTML entities.
- Markdown Preview — render Markdown as HTML with live preview.