Seven free tools to diagnose and calibrate the state of your monitor

In recent months we have been offering you several lists with useful tools to know who may be stealing WiFi, check the health of your hard drive, dominate your partitions, or monitor the performance of Windows, GNU / Linux and macOS. Now it’s the turn to another important component for any computer, your monitor.

That’s why today we’ll offer you a list of free tools to diagnose the condition of your monitor and calibrate it to your liking. Some are installable tools, but since we want it to be a useful tool for all operating systems we have also included several web apps that will work on any operating system.

Photo Friday

Photo Friday is a monitor calibration tool, a web page that will show you various elements that will help you adjust the brightness and contrast of your screen . The idea is that you have it open, and that based on what you see in it you can get entangled in the configuration of your monitor. To make it work better it is advisable to press F11 to see it in full screen.

Thanks to the elements shown in this website, when you make changes in the configuration of your monitor you can distinguish the transitions of the tones from blackest black to true white, and see in real time what influence the changes you make. It includes several tips that explain how to calibrate the screen using the web.


If you’ve noticed that your screen has a pixel that looks dead, maybe the only thing that happens is that it’s stuck in a certain color, something that can be annoying. JScreenFix is a web application that can help you. It does this by creating a frame that displays hundreds of different colors per second, and you can move around the screen to place it in the area where the rebel pixel

Keeping the picture on the affected area for about ten minutes, the rebel pixel should unclog and return to normal. It is not something that always works, of course, but in case the problem with the pixel persists it may be because it is a physical defect on the screen and that it will always remain there. Still, it’s a good tool to give it a second chance before you give it away for lost.

Screen Check

This is another screen to calibrate the monitor, a simpler and simpler, but in which you can also see if you have well configured our brightness and color. It is called Screenchec, and in its upper bar the tones are checked with a white to black band. Meanwhile, in the lower one shows a soft RGB spectrum to check if there are color breaks.

Eizo Monitor Test

Eizo Monitor Test is a simple piece of freeware that contains several tests with which to test the performance of your monitor. No need to install anything, you download a .zip file, unzip it and use the executable to launch it. They are several tests, and you will have a control panel with a button that serves to go through them.

Among the tests you will find patterns, reproduction of colors black, white, red, green and blue, moire patterns, geometry, gray scales, gray gradients, contrast, convergence and response tests. It also offers even colors to find dead pixels.

The Lagom LCD Monitor Test Pages

Another page to test the monitor of your computer and calibrate it, only unlike the others, does not conform to a single test but offers you a whole collection of them. With The Lagom LCD Monitor Test Pages you can measure contrast, gamma calibration, black level, white saturation or response times.

With each test you click a few instructions will explain how to use it when calibrating the computer, although these tutorials are something that can be disabled. The web also gives you the option to download all these images in a ZIP file, so that you can take them in a USB and calibrate the monitor of other computers.

Monitor Calibration Wizard

Monitor Calibration Wizard is another simple, free and easy to use application to calibrate your monitor and detect any defects. It works for all Windows operating systems from 95, and its great benefit is that it guides you step by step through the process of creating a unique profile for each computer.

It has support for an infinite number of profiles, gives you tips to prevent other programs from changing the color settings in your Windows, and generally simplifies to the maximum the sometimes complex task of having the monitor configured as it should.

Online Monitor Test

And we end up with another web to calibrate the screen, because Online Monitor Test is simply the best you can find. It has three modes, each with several options. The first is the Color Range, which gives you the ability to see multiple color palettes or all on a single page, so you can see if your monitor handles color gradients well.

With the Trailing options you can move a box through the screen to check for traces or ghost images. And finally there are the Homogenuity option tests, which show spot colors to help you identify dead pixels or faulty monitors with backlit leaks.

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