Free Responsive Website Emulator

Build, Test & Debug Responsive Websites With Our Life Time FREE Tool LT Browser.

Windows 7+, OS X 10.10+ & Ubuntu 12.04+Download LT BrowserDownload
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Ltbrowser Laptop testingEnter

Device 1

Device 2

iPhone 12 pro(1170x2532)


Google Pixel (1080 x 1920)

Google Pixel

Why my mobile website refused to connect? : Your website may not be supporting iframe. Don't worry LT Browser has it covered. Download and install LT Browser to enjoy un-interrupted mobile website testing for FREE!!


Accelerate Testing with Our Responsive Website Emulator


Custom Device Resolutions

Create and save your own device viewports. Test your website on mobile, tablet or Computer viewports.


Side-by-Side Mobile View

Work on two screen simultaneously. Compare multiple viewports without switching any window.


In-built DevTools

With In-built DevTools you can easily debug your website across multiple device sizes while checking responsive layout..


Google Lighthouse Report

One Click Lighthouse report gives you the scoop on your website’s performance, accessibility, SEO, and more.


Quick Bug Logging

With bug logging you can share, track and fix bugs of your website over Trello, Jira, Asana, Slack and more-all from one window.


Network Simulation

LT Browser offers a network throttling feature to test responsive websites on slow 3G to 5G networks with a dedicated button.

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What is a responsive website?
A responsive website is a website that provides the same optimal viewing experience on any device. It uses fluid, proportion-based grids and flexible images to adapt the layout of content to the size of the screen, no matter what device or window size.
How can I test responsive website?
LT Browser is a handy website emulator for checking the responsiveness of your website on several kinds of devices. It allows you to create custom screen resolutions and then test your site for responsiveness at each resolution.
What is responsive website emulator?
It is a type of software or virtual environment designed to emulate the responsive behavior of a website over multiple screen resolutions. LT Browser is the best website emulator for development and testing of a website
Why responsive website testing is important?
You should test responsiveness of your website to make sure it responds well to users coming from different browsers, devices and screen sizes. It is a best way to make sure your site runs as smoothly as possible.
What are the popular devices I should test my website on?
Following are the major devices one should consider fot responsive testing.
Mobile- iPhones, Samsung Galaxy series, OnePlus phones of past 2 to 3 years.
Tablets- iPads and Samsung Tablets launched in past 3 to 4 years
PCs- Laptops from Lenovo, Dell, Apple for past 5 years
How to make my website responsive?
There no one size fits all but following are the major points should keep in mind for testing the website.
  • 1. Choose a mobile responsive theme for website
  • 2. Use light images , videos, and CSS
  • 3. Prefer easy to read font and font size
  • 4. Check for CTA designs, size and placement
  • 5. Avoid un necessary pop-ups
  • 6. Avoid un necessary hyperlinks on website
  • 7. Test website regularly
What is the difference between responsive and adaptive design?
Responsive website is fluidic enough to adapt to any shape or size of the viewing device. Adaptive website first detect a predefined resolution and shows pre decided static elements of the website. Google ranks mobile friendly websites higher then any other form of website.

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