How to use the HTML Viewer
- Type or paste your HTML code in the left box. Click Load Example to start from a working page.
- The preview on the right updates as you type. Turn off Live update and click Run if you prefer.
- Use the Full, Tablet and Phone buttons to test different screen widths.
- Turn Allow JavaScript off if you only want to preview HTML and CSS.
- Click Copy Code or Download .html when you are happy.
Features
- Live preview of HTML, CSS and JavaScript in a safe sandbox.
- Responsive preview: full width, tablet (768 px) and phone (375 px).
- Tab key inserts spaces. Ctrl or Cmd + Enter runs the code.
- Copy the code or download it as a .html file.
- Works offline in your browser. Nothing is sent or saved. Free, no signup.
Frequently Asked Questions
Is my code saved or sent anywhere?
No. Everything runs in your browser. Your code stays on your device.
Why do my images not show?
Use full web addresses that start with https:// and make sure the image is public. Files on your own computer cannot be used.
Can I use JavaScript?
Yes. The preview runs scripts in a sandbox that cannot reach this website. You can turn JavaScript off with the checkbox.
Can I load external CSS or fonts?
Yes. Link tags with full https addresses work, for example Google Fonts.
Does this check my HTML for errors?
No. Browsers are forgiving, so the preview may still show something. To validate your code, use the W3C Validator.
Is there a size limit?
No fixed limit, but very large code can be slow in your browser.