⚡ Free Browser Tool • Private Preview • No Login • No Install
HTML Viewer Online — Free HTML Editor & Live Preview Tool
HTML Viewer Online lets you paste, edit, run and preview HTML code instantly in your browser. Use the live preview, full screen preview, HTML formatter, validator, minifier, mobile preview and import/export tools without creating an account.
What is HTML Viewer Online?
An HTML viewer online is a browser-based tool that renders HTML source code into a live webpage preview. Instead of saving a file, opening it manually and refreshing again and again, you can paste your HTML code, click Run and see the output immediately.
This tool is useful for students, developers, content teams and anyone who needs to quickly test HTML, CSS and JavaScript snippets. It also works well for previewing AI-generated HTML code before using it in a website, email template or project.
Full Screen HTML Viewer
Use Full Page mode when you need a clean full screen HTML preview without the editor beside it. This is helpful for checking landing pages, HTML email layouts, AI-generated designs, printable pages and responsive sections in a larger view.
- Preview rendered HTML in a distraction-free full page overlay
- Use browser print options to save the rendered output as PDF
- Switch between desktop, laptop, tablet and mobile preview widths
- Take a screenshot of the rendered preview when needed
HTML Viewer Online features
Live HTML Preview
Paste HTML code and instantly render it in the preview pane.
HTML Editor
Write and edit HTML with syntax highlighting, line numbers and word wrap.
Full Screen Preview
Open the output in a clean full page overlay for better checking.
HTML Formatter
Beautify messy HTML code with automatic indentation.
HTML Minifier
Compress HTML by removing unnecessary whitespace and comments.
HTML Validator
Check common markup issues such as missing title, viewport or unclosed tags.
Mobile Preview
Test the same HTML in desktop, laptop, tablet and mobile widths.
Import & Save
Import local HTML files and save your edited code back to your device.
How to use this HTML viewer
1. Paste HTML
Paste your HTML code into the editor or import a local .html file.
2. Click Run
Render the code in the live preview pane using the Run button or Ctrl+Enter.
3. Format or validate
Use Format, Minify, Validator, Accessibility and Meta/OG panels when required.
4. Preview full screen
Use Full Page mode or device buttons to test the output at different sizes.
Preview AI-generated HTML code
If you generate HTML using ChatGPT, Gemini, Claude or another AI coding tool, paste the code here and preview it instantly. You can format the code, check basic validation issues, open the output in full screen mode and test how it looks on mobile widths.
This makes the tool useful for quick experiments, landing page drafts, small components, email layouts, CSS snippets and learning projects.
Common use cases
Students learning HTML
Practice tags, tables, forms, CSS and layout snippets without installing a code editor.
Developers testing snippets
Quickly test HTML, CSS and JavaScript snippets before adding them to a project.
HTML email preview
Check email template structure and visual output before sending or exporting.
Content and SEO teams
Review headings, meta tags, Open Graph tags and simple page sections visually.
Frequently asked questions
What is HTML Viewer Online?
It is a free browser-based tool to paste, edit, run and preview HTML code instantly with live preview and formatting tools.
Can I preview HTML in full screen?
Yes. Click the Full Page button to open the rendered output in a clean full screen preview.
Is my code uploaded to a server?
No. Normal editing and previewing happen inside your browser. The Share feature encodes code in the URL hash.
Can I format HTML online?
Yes. Use the Format button to beautify and indent messy HTML code automatically.
Can I preview AI-generated HTML?
Yes. Paste HTML generated by an AI tool and use Run, Format, Validator, Full Page and Mobile Preview to test it.
Does it work on mobile?
Yes. The page works in modern mobile browsers and also includes a dedicated mobile preview width.