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HTML Viewer

Preview and render HTML live in a sandboxed frame.

PDF & Document ToolsBrowser-only • PrivateFree

HTML Source

Rendered Output

The preview runs in a sandboxed iframe with scripts disabled for your safety. Nothing is uploaded.

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About HTML Viewer

The HTML Viewer renders your HTML in a sandboxed iframe so you can preview a page or snippet exactly as a browser would, safely and instantly. It's handy for checking email templates, markup fragments, and quick experiments without creating a file. Rendering happens locally in your browser and the sandbox isolates the code. To tidy your markup first, use the HTML Formatter, or convert from Markdown with the Markdown to HTML tool.

How to Use

1Open HTML Viewer and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Previewing markdown and HTML before publishing
Formatting and minifying CSS, JavaScript, and HTML
Converting between markdown and HTML for docs and CMSs
Cleaning up code snippets for readability

Frequently Asked Questions

Is it safe to preview arbitrary HTML?

Yes. The HTML renders inside a sandboxed iframe that isolates it from the rest of the page, so scripts in your snippet can't affect the tool or your other tabs.

Will external images and styles load?

Linked resources load if their URLs are reachable, so a self-contained snippet previews fully. For consistent results, inline your critical styles before previewing.

Is HTML Viewer free to use?

Yes. HTML Viewer is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use HTML Viewer?

Absolutely. HTML Viewer runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.