TetraKits
Paste HTML markup and see the rendered page instantly in a sandboxed preview. Test snippets, email templates, and landing page sections without setting up a local server or deploying to staging. The TetraKits HTML Viewer runs entirely in your browser — free, private, and ready on mobile or desktop.
Overview
Email template QA, snippet debugging, and quick layout checks should not require npm, localhost, or a deploy pipeline. Paste markup and see the rendered result immediately in a private browser preview.
How to use the html viewer
- Paste your HTML — Enter full page markup or a fragment in the source pane. Include <style> blocks for CSS.
- View rendered output — The preview pane updates live. Layout, typography, and colors render as they would in a browser.
- Edit and iterate — Adjust markup and re-preview. For writing HTML from scratch, use the HTML editor.
Common use cases
- Paste your HTML: Enter full page markup or a fragment in the source pane.
- View rendered output: The preview pane updates live.
- Edit and iterate: Adjust markup and re-preview.
- Bookmark for quick access: Save the tool for repeat tasks without installing an app.
Frequently asked questions
Does the viewer render CSS?
Yes. Inline styles and <style> tags in your pasted HTML apply in the preview iframe.
Can I preview JavaScript?
The sandboxed iframe restricts script execution for security. Use this viewer for HTML and CSS output.
Do I need a full HTML document?
Fragments work — the viewer wraps content in a minimal document. Full <html> pages also render correctly.
Is my HTML uploaded anywhere?
No. Rendering happens entirely in your browser. Pasted markup never leaves your device.
Is this HTML viewer free?
Yes. Unlimited previews with no signup.
