Email & newsletter templates
Preview newsletter HTML at mobile width before you send, so broken tables and cramped columns never make it to your subscribers.
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HTML Viewer
Preview any HTML, live
Use this free HTML viewer to paste or upload HTML code, see it render live in your browser, and check responsive layouts at desktop, tablet, and phone widths. Everything runs locally — publish only when you are ready to share.
Private by designThe preview renders in your browser. Your code never leaves the device until you hit publish.
Any screen sizeSwitch between desktop, tablet, and phone widths to check responsive layouts.
Publish in one clickTurn your code into a hosted page with a public link — no account needed.
How it works
A code viewer and previewer that stays on your device
Paste HTML, CSS, and JavaScript and watch it render instantly in a sandboxed iframe — no build step, no server round-trip. Tidy messy markup in one click, switch preview widths to catch responsive issues, and export a clean .html file whenever you need a copy. The preview is fully local: nothing you type is uploaded, tracked, or stored until you explicitly publish, so it also works as a private HTML previewer for snippets, email templates, and landing page mockups.
Need to change the markup or restyle the result? Open the HTML Editor or Visual Remix.
Want to shrink and harden the markup before sharing? Run it through the HTML Compiler to strip comments and inline bloat.
What you can do
Preview and polish any HTML, from emails to landing pages
Size it, refine the markup, and when it is ready publish it as a hosted page with a public link — or use Markdown to HTML to host Markdown instead. Everything you need for fast HTML work in one place.
Embed a hosted image straight into your preview with Image Hosting.
Landing page mockups
Mock up a landing page or product page in minutes, tune the layout at three screen sizes, then publish a shareable link.
Snippets & learning
Test a button, an animation, or a form without touching a real server — the fastest way to experiment with HTML, CSS, and JavaScript.
Who it's for
For developers, designers, and quick experiments
Test a snippet, check a responsive layout, or build a small page before you share it with the world.
View freely
A distraction-free view with instant preview. No build step, no server round-trip.
Preview at any size
Toggle desktop, tablet, and phone widths to catch responsive issues before publishing.
Share in seconds
Publish to a public URL when you are ready, or keep everything local if you are not.
How it works
From snippet to hosted page
No account, no setup. Write, preview, and publish when it is ready.
Write or paste
Type your code, load the sample, or import an existing .html file.
Preview instantly
See the result live in a sandboxed frame, with responsive width presets.
Publish the link
Get a public URL you can share anywhere — or keep it local and just export the file.
Questions
HTML Viewer FAQ
Is my code uploaded?
No. The preview renders entirely in your browser. Your code only reaches a server when you press Publish.
Is the preview safe?
The preview runs in a sandboxed iframe, so scripts are isolated from the page itself. Your browser still executes the JavaScript exactly as a visitor would see it.
Can I check responsive layouts?
Yes. Switch between desktop, tablet, and phone widths to see how your page behaves at different screen sizes.
What happens when I publish?
Your code becomes a hosted HTML page with a public link. You can delete it later from the history on this page.
Can I preview HTML with CSS and JavaScript?
Yes. The preview runs your full HTML, CSS, and JavaScript in a sandboxed frame, so you can test interactive pages, forms, and animations exactly as a visitor would experience them.
Is there a file size limit?
The viewer itself has no hard limit. When you publish, the page is hosted like any other HTML Hoster page and shares the same limits.
How is this different from Markdown to HTML?
The HTML Viewer works with raw HTML, CSS, and JavaScript. If you prefer writing in Markdown, use Markdown to HTML to convert a .md file into a hosted, styled page.
Can I export or download my code?
Yes. Use Export .html to download your code as a file, or open the preview in a new tab to inspect it in a full browser window.