Write code. Watch it render.
Type or paste your HTML, CSS and JavaScript into the three panels, then render a live, sandboxed preview. Everything runs locally — nothing is uploaded.
Drop an .html file here or tap to browse
Or paste your code directly below
Four steps to a live preview.
No setup, no build step — here's the entire flow.
Add your code
Type or paste HTML, CSS and JavaScript into the three panels, or drop in an .html file to load the markup.
Pick a viewport
Choose Phone, Tablet, Laptop or Full width to check how your layout responds at different sizes.
Render the preview
Tap Render preview, or turn on Auto-refresh and the frame updates shortly after you stop typing.
Inspect and download
Check the console for logs and errors, then download a complete .html file combining everything.
Built for testing, not just typing.
The details that make iterating on a small page or component faster, without ever leaving your browser.
Runs on your device
Your HTML, CSS and JavaScript are assembled and rendered locally in a sandboxed iframe. Nothing leaves your device.
Real-time preview
See changes instantly at Phone, Tablet, Laptop or Full width, with an optional auto-refresh as you type.
Console capture
Console output and runtime errors from the preview are captured and shown below the frame, so you can debug without devtools.
Questions people actually ask.
The short answers — with the long ones one tap away.
How do I use this HTML preview tool?+
Type or paste your HTML, CSS and JavaScript into the three panels, then tap Render preview. The output appears in the sandboxed frame on the right, ready to inspect, copy, or download.
Is my code uploaded to a server?+
No. Everything runs locally in your browser. Your HTML, CSS and JavaScript never leave your device, so it's safe to use with private or sensitive code.
Can I test JavaScript in the preview?+
Yes. JavaScript is executed inside a sandboxed iframe. Any console.log, console.warn or console.error calls, plus runtime errors, are captured and shown in the console panel below the preview.
What viewport presets are available?+
You can preview at Phone (375px), Tablet (768px), Laptop (1280px) or Full width. This helps you check responsive layouts without resizing your browser.
Can I auto-refresh the preview while typing?+
Yes. Turn on Auto-refresh and the preview updates shortly after you stop typing, so you can see changes live without pressing a button.
Does the preview include a CSS reset?+
Yes. A minimal, modern reset (box-sizing, margin, font) is injected automatically so your preview looks consistent. You can turn it off if you want the browser defaults.
Can I download the rendered HTML?+
Yes. Tap Download .html to save a complete file that combines your HTML, CSS and JavaScript into a single document you can open or host anywhere.
Is this HTML previewer free to use?+
Yes, it's completely free with no account, no sign-up, and no limit on how many times you use it.