HTML Viewer
HTML Viewer
Render HTML in a sandboxed preview, inspect escaped source, and extract plain text with line-aware diagnostics.
Live summary
3 tags • depth 2 • 79 bytes.
The iframe preview always stays sandboxed and script-free. This setting only changes what the preview tab copies.
Result
Markup structure looks balanced
No unmatched opening/closing tags were found in the current input.
Tags
3
Unique tags
3
Depth
2
Text chars
51
Source bytes
79
Privacy note
Flow
- Rendered preview uses a sandboxed iframe so script execution is blocked by default.
- Escaped source mode preserves HTML safely for copy/paste into docs and code reviews.
- Text extract mode strips tags while diagnostics highlight common tag-balance issues.
Example
Worked example: inspect a CTA snippet
- 1 Paste `<section><h2>Signup</h2><button>Join</button></section>` in the input.
- 2 Open Rendered Preview to confirm layout and button text.
- 3 Switch to Escaped Source and copy HTML entities for documentation.
You get visual verification plus copy-safe escaped output without leaving the browser.
How
- Paste HTML into the input panel and choose preview viewport (mobile/tablet/desktop).
- Switch between Rendered Preview, Escaped Source, and Text Extract tabs depending on your task.
- Copy panel-specific output, then clear or reset for the next snippet.
Cases
- Validate a UI fragment before embedding it in a CMS block.
- Extract readable text from HTML content for quick content audits.
- Review risky snippets with script/style warnings before sharing.
Avoid
- Assuming script tags will run in preview. The sandbox intentionally blocks execution.
- Pasting incomplete fragments with unclosed tags and ignoring diagnostic messages.
- Copying rendered text when you actually need escaped source for markdown/docs.
FAQ
Does html viewer send my input to a server?
No. HTML Viewer handles the input in your browser whenever possible, so routine conversions, previews, and copy actions stay on your device instead of being sent to Calctrove servers.
Does preview execute JavaScript inside my snippet?
Preview is sandboxed and script execution is disabled by default for safer inspection.
Can I extract plain text from complex markup?
Yes. The Text Extract tab strips tags and returns readable content for quick checks.
Switch
Switch12
No match.