See what your HTML looks like without creating a file

Sometimes you just need to know how a fragment renders: an email block, a widget from a vendor, or a snippet a colleague pasted into chat. Saving it as a .html file, finding it in a folder and opening a browser tab is a lot of steps for a quick look. This viewer gives you an editor and a preview frame on one page so you can paste, click and look.

Previewing a snippet

1. Paste your markup into the HTML Source editor. The Paste button reads from your clipboard, and Load Sample inserts a styled card with a heading, a button, a rule and a list so you can see the expected result.
2. Click Render Live Preview. The page shows a Rendered Result panel with your code drawn in an embedded frame.
3. Use Toggle Width to switch the preview container between full width and a narrower 600 pixel column, which is a rough way to see how a layout behaves when it has less room.
4. Edit the code and press the render button again to refresh; the preview updates when you click, not on every keystroke. Clear empties the editor.

What renders and what does not

• Full documents and fragments both work. Inline styles, style blocks and images with reachable addresses appear as they would in a browser.
• Stylesheets or images linked from other sites load only if those addresses are accessible from your browser and allow it.
• Relative paths, such as a local images folder, have nothing to point at here and will show broken.
• The frame has a fixed height of 500 pixels and scrolls if the content is taller.

Where a quick viewer helps

• Checking an HTML email block for obvious layout mistakes before pasting it into an email tool.
• Trying a CSS idea in a style block and comparing it with a variation.
• Reviewing a code answer from a forum before copying it into a project.
• Showing a client a prototype card or button without deploying anything.

Safety and other limits

The header displays the word SANDBOX, but the preview frame is drawn on the same page and does not carry browser sandbox restrictions, so scripts in your markup do run. Only render code you understand; do not paste snippets from unknown sources that contain script tags, and never include real passwords or tokens in test code. Because everything happens in your browser tab, nothing is fetched from a server for the rendering itself. The viewer does not simulate specific devices or browsers; it shows what your own browser produces. For structural problems, use a validator, since browsers quietly repair broken markup and the preview may look fine anyway.

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