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ToolHive

HTML Preview

Write HTML on the left and see the rendered result on the right, instantly. A free online HTML previewer and live editor that runs entirely in your browser, with autosave, formatting and download.

HTML Tools

How to use HTML Preview

  1. Paste or type your HTML into the editor on the left.
  2. The preview pane on the right re-renders as you type, so there is nothing to click.
  3. Add style or script tags directly in your markup; they run inside a sandboxed frame.
  4. Press Tab to indent, Shift + Tab to outdent, and use Format to re-indent the whole document.
  5. Switch the preview between Full, Tablet and Mobile widths to check a responsive layout.
  6. Copy the markup, download it as index.html, or open the rendered page in a new tab when you are done.

Examples

A minimal page

The smallest valid HTML document you can preview.

<!DOCTYPE html>
<html>
  <head>
      <title>My Page</title>
  </head>
  <body>
      <h1>Hello, World!</h1>
  </body>
</html>

Styling with inline CSS

A style block is applied to the preview immediately.

<style>
  body { font-family: system-ui; color: #2563eb; }
</style>
<h1>Styled heading</h1>

Checking a responsive layout

Add a media query, then switch the preview to Mobile to see it apply.

<style>
  .grid { display: flex; gap: 12px; }
  @media (max-width: 480px) {
      .grid { flex-direction: column; }
  }
</style>
<div class="grid"><div>A</div><div>B</div></div>

Running a snippet of JavaScript

Scripts execute inside the sandbox, so you can test behaviour, not just markup.

<h1 id="out">0</h1>
<button onclick="document.getElementById('out').textContent = Date.now()">
  Update
</button>

Features

  • Instant live preview with no build step and no page reload
  • Runs fully client-side, so your markup never leaves your device
  • Autosaves your draft to this browser and restores it on your next visit
  • One-click Format re-indents the document without touching script, style or pre blocks
  • Copy to clipboard, or download a ready-to-open index.html file
  • Responsive preview widths for mobile, tablet and full desktop
  • Supports inline CSS and JavaScript inside a sandboxed iframe
  • Keyboard shortcuts: Tab to indent, Ctrl/Cmd + S to download, Ctrl/Cmd + Enter to re-run
  • Works offline once the page has loaded, with no signup and no usage limits

Frequently asked questions

Is my HTML uploaded anywhere?
No. The editor and the preview both run in your browser, so your markup is never sent to a server. That makes the tool safe for unreleased work and client code.
Where is my work saved?
Your draft is saved to this browser's local storage roughly half a second after you stop typing, and restored the next time you open the page. It never leaves your device, and Reset clears it.
Does JavaScript run in the preview?
Yes. The preview is a sandboxed iframe, so scripts execute but cannot read or change the ToolHive page around them.
Can I preview a full page with head and body tags?
Yes. Paste a complete document, including the doctype, and it renders exactly as a browser would render the file.
How do I download the result?
Use the Download button, or press Ctrl + S (Cmd + S on a Mac). You get a standalone index.html file you can open directly or drop into a project.
What does the Format button do?
It re-indents the document by tag depth using two spaces. The contents of pre, textarea, script and style are left untouched, because re-indenting them would change what the page renders or runs.
Can I test a responsive design?
Yes. The Full, Tablet and Mobile buttons above the preview constrain it to 768px and 375px, so media queries and breakpoints behave as they would on a real device width.
Can I load external CSS or scripts from a CDN?
Yes, as long as the CDN allows it. The preview is a real browser frame, so link and script tags pointing at public URLs load normally.
Does it work offline?
Once the page has loaded, the editor and preview keep working without a network connection. Only external resources your own markup requests would fail.

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About HTML Preview

HTML Preview is part of HTML Tools on ToolHive, a growing collection of small, focused utilities for developers, designers and students. Preview, format, escape and inspect HTML straight in your browser — no build step required. Everything runs client-side, so your data never leaves the browser tab — which makes these tools safe to use with work-in-progress code and private content.