How To Test Websites in Different Screen Sizes

Testing a website in different screen sizes is essential because it helps ensure that it is responsive and looks good on various devices. Today’s generation accesses the internet using many devices, including smartphones, tablets, laptops, and desktop PCs. Each of these devices has a different screen size, and a website needs to be able to adapt to these different screen sizes to provide a good user experience. This post will share some of the best services and extensions to test websites in different screen sizes.

How To Test Websites in Different Screen Sizes

How To Test Websites in Different Screen Sizes

There are numerous extensions one can use to test websites. However, you must opt for the right one based on your needs. Here is the list of the top extensions/services for website testing.

  1. Lambdatest
  2. Screenfly
  3. BrowserStack
  4. Am I Responsive
  5. Sizzy

Take a look –

1] Lambdatest

Lambadatest - Best Website Resolution Testing Apps

Lambdatest offers LT Browser for efficient and reliable screen resolution testing. You can use this tool to test on different devices such as PC, tablets, mobile, and more. Apart from that, you can also add custom screens. Use the sync roll feature to improve productivity immensely. You can now test the website in multiple screen sizes at once.

LT Browser enables users to perform excellent website auditing. Besides, it is also possible to share reliable bug reports with others. You can use the network throttling feature to test the website’s responsiveness on multiple network profiles. It also enables video recording and full-page screenshots seamlessly.


  • Easy integration with circle CI
  • Environment stability
  • Slack app with testing cards


  • Robust automation grid
  • Numerous integrations


  • Lack of dashboard analytics

Go to Lambdatest

2] Screenfly

Screenfly - Best Tool to Test Website Resolution

Do you want to see how your website looks on different-sized screens? In that case, you can opt for Screenfly. With this tool, you can test a site’s interface and visual elements. That way, you will know how the website performs with different resolutions and devices.

Screenfly is a well-known free web application with a user-friendly interface. You need to enter the URL of the site you want to test. After that, you must select the device type from the menu and wait for the results. The tool offers devices such as computers, tablets, televisions, and mobile devices and their resolutions.


  • Enable rotate display and scrolling
  • Availability of different resolutions for various devices
  • User-friendly interface


  • Registration not required
  • Easy to use


  • None

Go to Screenfly

3] BrowserStack

BrowserStack - Best Tool to Test Website Resolution

If you are looking for a reliable website testing platform, you can choose BrowserStack. Here, you can seamlessly test various web and mobile apps in different browsers and mobile devices. There is no need for virtual machines or evaluators.

The cloud-based testing platform offers cross-browser compatibility. Using this tool, you can check if the app works as you want in various web browsers. You can either opt for the automation mode or go the manual route for testing.

BrowserStack eliminates the complexity of constantly switching between browsers and operating systems. One of the most impressive features is its flexibility. You can use it from anywhere and take advantage of the scalability feature.


  • Covers testing for Android devices
  • Test across various iOS versions
  • Supports automation and manual testing


  • Cross-browser testing
  • Doesn’t need to use virtual machines


  • Not open-source

Go to BrowserStack

4] Am I Responsive

AmIResponsive - Best Website Responsive Testing Tool

One of the most well-known web testing tools is Am I Responsive. Using this tool is easy and hassle-free. All you have to do is to enter the URL of the website you want to test in the input field. Press the GO button and wait for the results.

You can take advantage of the screenshot-taking feature and assess the responsive design factor. The tool works quickly and offers results without any lag. It is vital to understand that the tool is more suited for quick screenshots so that you can deliver presentations about the visual aspects of meetings.

It offers resolutions for four types of Apple devices. These include laptops (1280 x 802 Pixel), mobiles (320 x 480 Pixel), desktops (1600 x 992 Pixel), and tablets (768 x 1024 Pixel).


  • Comparison of different sizes directly
  • Allows users to take screenshots
  • Test websites on local hosts


  • Offers quick results
  • Easy to use


  • Too basic

Go to Am I Responsive

5] Sizzy

Sizzy Tool to Check Website Responsiveness

The last one on the list of the best tools for website testing is Sizzy. It boasts of being the preferred browser for web developers. It comes with a wide range of features, explaining its popularity. For instance, it allows A/B testing.

You can also use Sizzy to test, monitor, and troubleshoot different APIs via the API Inspector Panel. This feature allows you to test form requests, GraphQL, and REST. Another impressive feature is device simulation. It enables device frame simulation and UI for OS and browser.

With Sizzy, customization is easy. Moreover, you can take screenshots of multiple devices at the same time. You can also disable the network per your preference for each device or device.


  • Customizable layouts
  • Recording and screenshot-taking abilities
  • Universal inspection element to inspect multiple devices simultaneously


  • Saves website testing time
  • Easy investigation of CSS bugs


  • Expensive

Go to Sizzy


You can use these different services/extensions to test the website in different resolutions. You will encounter multiple challenges while testing the site as a software tester. The trick is to choose the testing extension that speeds up the process without affecting the efficiency. You don’t want to have inaccurate reports to make up the speed.

What are you waiting for? Try out these website testing extensions today!

Yogesh Mankani
Yogesh Mankani has been a freelance content writer for the last ten years. His passion for blogging and giving words to his ideas and thoughts make him fall more in love with his profession, which he takes very personally.


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