HTML Viewer
Renders pasted HTML visually in a fully sandboxed iframe — scripts, forms, and same-origin access are all disabled, so pasted markup is shown safely without ever executing.
How it works
Paste HTML into the input panel and click View.
Frequently asked questions
- Is it safe to paste HTML from an untrusted source?
- Yes — the preview renders inside an iframe with an empty sandbox attribute, which disables scripts, forms, popups, and same-origin access entirely. Nothing in the pasted HTML can execute.