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iToolVersev3.1

HTML Viewer — Preview HTML Online, Live

Paste any HTML and see it render instantly

A free, private HTML sandbox in your browser — no signup, no install, no upload. Test HTML emails, landing pages, snippets, or debug markup with syntax highlighting, responsive preview modes, and live rendering.

HTML Code0 lines · 0 characters

Paste your HTML to preview it live

Drop in any HTML snippet — emails, landing pages, components — and see it rendered instantly.

Preview (desktop)

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What is the HTML Viewer?

The HTML Viewer is a free online HTML previewer that renders HTML code in real time, directly in your browser. Paste any markup — an email template, a landing page, a Tailwind component — and see it rendered instantly with no signup, no install, and no upload.

Unlike full code playgrounds, this tool is purpose-built for one job: rendering HTML fast. That keeps it lightweight and shareable. Your code stays in your browser, and shareable links encode the snippet directly into the URL — no backend, no storage, no tracking.

HTML Viewer features

Instant live preview

See HTML render in real time as you type — no save, no reload, no server required.

Syntax highlighting & line numbers

Powered by CodeMirror 6 with bracket matching, auto tag-closing, and folding for readable markup.

Resizable split view

Drag the divider between editor and preview to dial in the exact ratio you want.

Responsive preview modes

Switch between mobile (375px), tablet (768px), and desktop widths to test how HTML looks on any device.

Sandboxed & private

Code runs in a sandboxed iframe and never leaves your browser. Nothing is uploaded or stored.

Shareable URLs

Compress your HTML into a link with one click. Recipients see the same preview with no signup.

Common use cases

HTML email templates

Preview transactional emails, newsletters, and marketing templates before sending.

Landing pages & snippets

Test hero sections, pricing tables, or any standalone HTML block in isolation.

Responsive design checks

Verify how layouts collapse on tablet and mobile widths without resizing your browser window.

Quick prototypes

Sketch HTML ideas, share them via URL, and iterate without spinning up a project.

Learning & teaching HTML

Type, render, and tweak — perfect for students, tutorials, and onboarding new developers.

Debugging markup

Paste broken HTML and quickly see what renders, what breaks, and where to fix it.

How to preview HTML online

  1. Paste or type your HTML into the editor on the left.
  2. The preview on the right updates live as you edit (toggle off Live Preview for manual refresh).
  3. Switch between mobile, tablet, and desktop widths to see how the layout responds.
  4. Use Open to view the rendered HTML full-screen, or Share to copy a link that contains the snippet.
  5. Drag the divider between panels to resize the editor and preview.

Frequently asked questions