Most modern LCD, LED, and TFT monitors support DDC/CI.

This is a simple, open-source tool designed specifically for multi-monitor setups. It lets you adjust the brightness of individual or grouped monitors with ease. It is available as a free download on the Microsoft Store and GitHub.

A highly popular, free app that adds a brightness slider to the system tray that matches the Windows 10 and 11 aesthetic. It allows you to manage multiple monitors at once and can even automate brightness changes based on the time of day. You can download Twinkle Tray from its official site or the Microsoft Store .

If your monitor’s lowest setting is still too bright, Dimmer is a small, portable utility that applies a software overlay to further reduce screen output. It is useful for late-night work and requires no installation.

Before downloading third-party software, check if these native methods work for your setup: There's no option to change screen brightness in Windows 10

The software works best when the monitor is connected directly via HDMI or DisplayPort, as some older adapters or docking stations may block the DDC/CI signal. Built-in Windows 10 Options