Your viewport size

Your screen resolution

Your native screen resolution


Looking for a quick and easy way to test your LCD or display screen? Look no further than our LCD test tool! This convenient online tool is designed to help you check your display screen for any issues, including dead pixels or existing pixels that aren't working correctly.

Our LCD test tool features a range of primary colors to help you quickly identify any potential issues with your display screen. Whether you're using a laptop, desktop computer, or mobile device, our online tool makes it easy to check your LCD or display screen in just a few clicks.

Additionally: offers a powerful tool that can accurately detect your device's screen resolution, viewport size, and even the real/native screen resolution taking into account the pixel density of your device. With our tool, you can easily get the information you need to optimize your website for your users' devices.

One of the most important pieces of information our tool provides is the real/native screen resolution of your device. This takes into account the pixel density of your device and provides a more accurate representation of the resolution than the reported resolution alone. By optimizing your website for the real/native screen resolution of your users' devices, you can ensure that your site looks great on any device, regardless of the pixel density.

Our tool also provides information about your device's viewport size, which is important for designing responsive websites that look great on both desktop and mobile devices. By optimizing your site's design for the viewport size of your users' devices, you can ensure that your site looks great and is easy to use on any screen size.

So why wait? If you're concerned about the health of your LCD or display screen, give our online LCD test tool a try today! It's quick, easy, and completely free to use.

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What is LCD?
LCD stands for Liquid Crystal Display, which is a flat panel display technology commonly used in televisions, computer monitors, and mobile devices.

How does the LCD work?
LCD works by using liquid crystals that are sensitive to electric charges to display images on a screen. A backlight is used to illuminate the screen.

How to test a laptop LCD screen?
If you are experiencing issues with your laptop LCD screen, you can use this tool to test its performance and identify any potential problems.
To test your laptop LCD screen, simply navigate to the tool and click on the separated color buttons. The tool will then display the selected color at fullscreen mode.
If you notice any abnormalities or defects during the test, it may indicate that your screen is damaged or malfunctioning. In this case, you may need to contact a professional repair service or replace the screen altogether.

How does the tool on your website detect the real screen resolution of a device?
This tool detects the real screen resolution of a device by taking into account the device's pixel density. It multiplies the reported screen resolution by the device's pixel density to provide a more accurate representation of the resolution.

Why is it important to optimize a website for the viewport size of a user's device?
Optimizing a website for the viewport size of a user's device is important because it ensures that the website looks great and is easy to use on any screen size. This is particularly important for responsive website design that adapts to different screen sizes on desktop and mobile devices.

Who can benefit for getting accurate information about their device's display settings?
Anyone can benefit from using the tool on our website to get accurate information about their device's display settings, whether they are web designers, developers, or simply curious about their device's display. By using our tool, they can ensure that their website is optimized for the real screen resolution and viewport size of their users' devices.

What is viewport size?
Viewport size refers to the visible area of a web page in a browser window or device screen. It's determined by the size of the browser window or device screen minus any space taken up by the browser's user interface elements like the address bar, tabs, and toolbar. The viewport size can vary depending on the device and browser being used. As viewport size can impact how a website is displayed on different devices and browsers, developers use responsive design techniques to adapt layouts to different screen sizes and resolutions. By using flexible layouts and media queries, developers can create websites that look good and are easy to use across different viewport sizes.

What is native screen resolution?
Native screen resolution refers to the physical number of pixels on a display screen. It is the maximum number of pixels that can be displayed on the screen and is determined by the hardware itself. For example, a display screen with a native resolution of 1920 x 1080 can display a maximum of 1920 pixels horizontally and 1080 pixels vertically. This resolution is also known as the "optimal resolution" and is typically the highest resolution that a screen can display. When a screen displays an image or video at its native resolution, the image will look the sharpest and most detailed. However, if an image or video is displayed at a lower resolution, it may appear blurry or pixelated. Native screen resolution is an important consideration for anyone working with digital media, such as photographers, graphic designers, and video editors.