Best Responsive Checker For FREE!!

Build, Test & Debug mobile websites.

Best Responsive Checker For Free

  • View Port Testing On Local Machine
  • Responsive Behaviour Checker
  • Side by Side View Port Comparison
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Ltbrowser Laptop testingEnter

Device 1

Device 2

iphone 12 pro(1170x2532)


Google Pixel (1080 x 1920)

Google Pixel

Why my 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 responsive testing for FREE!!


Boost your Productivity and Quality of Work with


Custom Device Resolutions

Create and save your own custom device viewports. Create mobile, tablet, and desktop screens to test websites on them.


Side by Side Mobile View

No need to switch between two viewports. Test on two screens simultaneously with this responsive checker.


Inbuilt DevTools

Use In-Built DevTools to debug multiple device sizes while checking responsiveness. Separate DevTools for both the view ports.


Google Lighthouse Report

Once click sharable google lighthouse report. Analyse key performance metrics, accessibility score, SEO, and more


One-Click Bug Logging

Mark a bug and share it on Jira, Trello, Asana, Slack and more. Share the bugs with a summary to solve it faster than ever


Network Throttling

In-Built network simulation to test websites on fast 3G, slow 3G, online, and offline. Get first hand user experience with LT Browser.

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What is responsive testing?
Responsive testing is testing of the UI/UX of a website on different viewports. Mobile, Tablets and PCs of different brands and OS have different resolutions, shapes and sizes. A responsive website or web app adapts to all those shapes, sizes and resolutions to give the best user experience.
Why is responsive testing important?
Testing responsiveness of the website ensures the best user experience, SEO performance and Least possible bounce rate.
How to test responsiveness of my website/webapp?
You can use LT Browser for responsive testing. It will help you check your website on 50+ viewports across Mobiles, Tablets and PCs of all Major OS. In Fact you can create your own custom viewports, and debug your website on those viewports
What are the popular devices I should check for responsiveness?
It depends on the devices used by your website visitors. Broadly we can consider as follows
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
What does a fully responsive website mean?
A fully responsive website will reshape and resize itself to preserve the best user experience and look and feel across all devices without any need of Scrolling, Zooming and Resizing.
How to measure the success of the responsiveness test for my website?
Once the website renders as it is required to render across all the view ports, and if the user is getting best user experience we can consider it a successful responsive test.
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. Fun Fact: Google ranks mobile friendly websites higher compared to any other form of website.

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