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Live HTML Viewer

Write or paste HTML, CSS and JavaScript and see it render instantly in a safe, sandboxed preview, with a built-in console. Free, in your browser.

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About this tool

About Live HTML Viewer

Live HTML Viewer turns any HTML, with inline CSS and JavaScript, into a live preview as you type. Paste a snippet from a tutorial, an email template or a component you are building, and the preview updates a moment after you stop typing. A built-in console captures console.log, info, warnings and errors from your scripts, including uncaught errors with their line and column, so you can debug without opening developer tools. Expand the preview to full screen, or open it in a new tab to test it at a full window size. The preview runs in a sandboxed frame with its own isolated origin: scripts can run, show alerts and open pop-ups, but they cannot read this site’s cookies or storage, which matters when you paste code from somewhere you do not fully trust. Copy your code or clear the editor in one click. Nothing is uploaded; the code stays in your browser.

Live HTML Viewer tool

What people test

Quick experiments without a project

Learning HTML and CSS

Try examples from a course and see what each line does.

ExampleChange a flexbox property and watch the layout move.

Email templates

Preview an HTML email before pasting it into a campaign tool.

ExampleCheck a newsletter header renders correctly.

Components

Prototype a button, card or form quickly.

ExampleBuild a pricing card and test hover styles.

Debugging snippets

Isolate a bug from a larger page.

ExamplePaste a broken menu and read the console errors.

Embeds

Test embed codes before adding them to a site.

ExampleCheck a form embed displays as expected.

Interviews and teaching

Show a concept live without set-up.

ExampleExplain event handlers with a clickable demo.

Tips for the viewer

Get more from quick tests

Use console.log

Log values to the built-in console to see what your script is doing.

Sandboxed by design

Code cannot read cookies or storage here, so login-dependent code will not work.

Test real widths

Open in a new tab and resize the window to check responsive layouts.

JavaScript only?

For pure JavaScript, the compiler shows output more clearly.

JS Compiler

Keep a copy

Your code is not saved; copy it before closing the tab.

Check performance

When it goes live, test the real page speed.

Website Speed Tester

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