Developer Tool Fast · Live Preview · Free HTML Viewer + Monaco Editor

HTML Online Viewer

Use this free HTML Online Viewer to write, paste, format, preview, and inspect HTML instantly. Test webpage snippets, landing page sections, email blocks, widgets, embeds, forms, cards, and raw HTML code with Monaco editor, live preview, beautify, minify, full preview mode, source view, file import, file export, and dark mode.

Pro Feature 1 Write or paste HTML in Monaco editor and preview the output instantly.
Pro Feature 2 Beautify, minify, import, export, copy, and inspect HTML source in one place.
Pro Feature 3 Perfect for snippets, tool sections, widgets, landing pages, forms, and raw HTML testing.
Category: Developer / HTML Tools
SEO Ready · Mobile Friendly · Instant Preview
Select formatting indentation.
Choose how the output area should be shown.
Preview updates while typing.
Switch tool UI between light and dark.
Quick presets
HTML Editor
Ln: 1 | Col: 1
Controls
Pro tip: Use Split View to see rendered output and source together while editing.
Output

Ready
Characters
0
Total characters in the editor.
Lines
0
Total lines in the current HTML code.
Tags Found
0
Approximate HTML tags detected.
Mode
Preview
Current viewer mode selection.
Auto Update
On
Whether live preview updates automatically.
Status
Ready
Current HTML viewer status.
HTML workspace
Paste HTML code and click Run / View to test it instantly.
How to use
  1. Paste or write your HTML code in the Monaco editor.
  2. Choose preview, source, or split mode.
  3. Use beautify or minify if needed.
  4. Click Run / View to render the HTML instantly.
Example
Input: A card layout, form, widget, or HTML snippet.
Action: Beautify and preview it instantly.
Output: Clean formatted source plus rendered live preview.
Use Case: Great for testing landing page sections, widgets, embeds, and custom HTML.
Where can you use this HTML Online Viewer?
Landing Pages & Widgets
Preview page sections, banners, embeds, cards, forms, and UI snippets before publishing.
Email & Template Testing
Inspect HTML email sections, layouts, newsletters, and reusable template blocks quickly.
Learning & Debugging
Test raw HTML, understand structure, format messy code, and debug output side by side.
When to use this tool
When preview matters
Use it whenever you want to see exactly how HTML renders before adding it to a webpage.
When code is messy
Beautify unreadable HTML and inspect the structure more clearly.
When exporting snippets
Prepare HTML blocks, save them, copy them, and test them quickly across workflows.
Frequently Asked Questions


This tool lets you paste HTML, format it, preview it live, inspect the source, and export the result.


Yes. You can use live preview mode or split view to see the rendered HTML instantly.


Yes. This tool includes both beautify and minify actions for HTML code.


Yes. You can import local HTML files and download the edited code again.


Yes. You can use this HTML viewer online for free.
About this free online HTML Online Viewer

This HTML Online Viewer helps you preview, format, inspect, and test HTML code instantly in the browser.
It is useful for developers, bloggers, email marketers, designers, students, and anyone working with HTML snippets.

This version uses Monaco editor for a more professional coding experience with syntax highlighting, minimap, line numbers, and a developer-style layout.

You may also find these related tools useful, including
HTML to Text Converter,
JSON Formatter & Validator,
Base64 Encoder Decoder,
Meta Tag Generator, and
Slug Generator.
Related tools


HTML to Text Converter
Extract clean text from raw markup after inspecting HTML structure.



JSON Formatter & Validator
Useful for API and developer workflows alongside HTML testing.



Base64 Encoder Decoder
Handle encoded strings used in embeds, assets, and dev workflows.



Meta Tag Generator
Create clean head metadata after testing HTML layouts.



Slug Generator
Create clean slugs for pages, snippets, and publishing workflows.


  \n';
} else if (type === 'card') {
html = '
\n
Product Card
\n
Premium quality item with clean layout.
\n  \n
';
} else if (type === 'table') {
html = '\n\n\n\n
NameRole
RahulFounder
PriyaDesigner
';
} else if (type === 'form') {
html = '
\n  
\n  
\n  
\n  
\n  \n
';
}
mtHovSetValue(html);
mtHovRenderNow();
mtHovUpdateCursorInfo();
}function mtHovInitMonaco() {
if (typeof require === 'undefined') {
document.getElementById('mt_hov_input_fallback').style.display = 'block';
return;
}require.config({
paths: {
vs: 'https://cdn.jsdelivr.net/npm/monaco-editor@0.52.2/min/vs'
}
});require(['vs/editor/editor.main'], function () {
mtHovEditor = monaco.editor.create(document.getElementById('mt_hov_monaco'), {
value: '\n\n\nHTML Online Viewer\n\n\n
Hello World
\n
Start editing your HTML here.
\n\n',
language: 'html',
theme: 'vs-dark',
automaticLayout: true,
minimap: { enabled: true },
fontSize: 14,
lineHeight: 24,
roundedSelection: true,
scrollBeyondLastLine: false,
wordWrap: 'on',
tabSize: 4,
insertSpaces: true
});mtHovEditor.onDidChangeModelContent(function () {
mtHovUpdateStats();
mtHovUpdateCursorInfo();
if (document.getElementById('mt_hov_auto_update').checked) {
mtHovRenderNow();
}
});mtHovEditor.onDidChangeCursorPosition(function () {
mtHovUpdateCursorInfo();
});mtHovUpdateStats();
mtHovUpdateCursorInfo();
mtHovRenderNow();
});
}document.addEventListener('DOMContentLoaded', function() {
const wrap = document.getElementById('mt_hov_wrap');
const mode = document.getElementById('mt_hov_view_mode');
const auto = document.getElementById('mt_hov_auto_update');
const dark = document.getElementById('mt_hov_dark_mode');
const fileInput = document.getElementById('mt_hov_file');mtHovApplyViewMode();
mtHovUpdateStats();mode.addEventListener('change', function() {
mtHovApplyViewMode();
mtHovUpdateStats();
});auto.addEventListener('change', function() {
mtHovUpdateStats();
});dark.addEventListener('change', function() {
wrap.classList.toggle('mt-hov-dark', !dark.checked ? false : false);
if (mtHovEditor && typeof monaco !== 'undefined') {
monaco.editor.setTheme(dark.checked ? 'vs-dark' : 'vs');
}
wrap.classList.toggle('mt-hov-dark', !dark.checked ? false : false);
});fileInput.addEventListener('change', function(e) {
const file = e.target.files[0];
if (!file) return;
const reader = new FileReader();
reader.onload = function(evt) {
mtHovSetValue(evt.target.result);
mtHovRenderNow();
mtHovUpdateCursorInfo();
};
reader.readAsText(file);
});document.querySelectorAll('.mt-hov-faq-question').forEach(function(btn) {
btn.addEventListener('click', function() {
const item = this.parentElement;
const isActive = item.classList.contains('active');document.querySelectorAll('.mt-hov-faq-item').forEach(function(faq) {
faq.classList.remove('active');
const s = faq.querySelector('.mt-hov-faq-question span');
if (s) s.textContent = '+';
});if (!isActive) {
item.classList.add('active');
const s = item.querySelector('.mt-hov-faq-question span');
if (s) s.textContent = '−';
}
});
});mtHovInitMonaco();
});

  



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