HTML Preview - Preview HTML

Write and preview realtime HTML/CSS/JS

HTML Code

Preview

Sample code

HTML Preview Online - Free realtime HTML/CSS/JavaScript preview tool

Tan Phat Digital's online HTML Preview tool allows you to write and preview HTML, CSS, JavaScript right in the browser with real-time live preview. Supports responsive testing with 3 viewport sizes: Desktop (100%), Tablet (768px), and Mobile (375px) to test layout on all devices. Auto refresh automatically updates the preview when you change the code, or turn it off to manually refresh when needed. There are 4 starter code templates available: Basic HTML, Form, Flexbox Layout, and CSS Grid to get started quickly. JavaScript runs in a secure iframe sandbox, supporting DOM manipulation, event handlers, and console.log. No registration required, no installation required, completely free. Great for learning HTML/CSS, rapid UI prototyping, testing code snippets, and debugging frontend code.

Outstanding features

Live preview realtime updates as soon as you type the code
Responsive testing with 3 viewports: Desktop, Tablet, Mobile
Auto refresh can be turned on/off as needed
4 starter code samples: Basic HTML, Form, Flexbox, Grid
Full support for HTML5, CSS3, and JavaScript ES6+
JavaScript runs in a secure iframe sandbox
Syntax highlighting for easy-to-read code
No need to setup local environment
No need to register an account
Completely free, unlimited use

Why is HTML Preview tool needed in web development?

HTML Preview tool is an indispensable tool for web developers and designers at all levels. For beginners, this is the fastest way to practice HTML/CSS without setting up a local server or a complicated IDE. For experienced developers, the tool helps quickly test code snippets, prototype UI ideas, and debug CSS issues without needing to switch context from the browser. Responsive preview is especially useful for testing layouts on different screen sizes without opening DevTools or resizing the browser window. Auto refresh helps see results immediately, speeding up workflow significantly. Sandbox environment ensures code runs safely, without affecting the main website.

Benefits when used

  • •Test HTML/CSS snippets quickly without setup
  • •Prototype UI ideas and layouts in minutes
  • •Learn HTML/CSS with realtime feedback
  • •Debug CSS issues with responsive preview
  • •Share code demos with colleagues
  • •Test safe JavaScript DOM manipulation
  • •No need to install IDE or local server
  • •Save time with auto refresh

Detailed instructions on how to use HTML Preview online

  1. 1Enter or paste HTML code into the left editor (can include CSS in <style> and JS in <script>)
  2. 2See the automatically updated preview in the right panel
  3. 3Click the Desktop/Tablet/Mobile buttons to test responsive layout
  4. 4Turn on/off Auto refresh as needed (turn off when the code is complex to avoid lag)
  5. 5Use built-in code samples to get started quickly with Form, Flexbox, or Grid
  6. 6Open browser DevTools to debug JavaScript if necessary

Cooperate immediately with Mavis Digital

We not only design websites, but also help businesses build strong digital brands. Providing comprehensive website design services from design to SEO optimization. Please contact Mavis Digital immediately to create breakthrough, effective and sustainable technology solutions for your business in Ho Chi Minh.

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