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HTML Preview

Paste embed code or a custom HTML block to see how it renders before pasting it into your post editor.

Preview

The preview renders in a fully sandboxed iframe with scripts, forms, and top-level navigation all disabled, so pasted embed code — an ad snippet, a widget, an affiliate banner — can't run any JavaScript or redirect the page while you're just checking how it looks.

Why does my widget show up blank here?

That's the honest limitation of the sandbox — a widget that depends on its own script to render anything, rather than just static HTML/CSS, will show blank here even though it would work fine once actually embedded on a live page with scripts allowed. This tool checks layout and static markup, not script-driven behavior.