Windows Brightness Control Guides
Practical, tested steps for changing display brightness on Windows — starting with the built-in controls and moving on to what to do when they are missing or greyed out.
How to Adjust Brightness on Windows 11
Change brightness on Windows 11 from Quick Settings, Settings or the keyboard, and add per-monitor sliders for external displays Windows will not control.
Read guideHow to Adjust Brightness on Windows 10
Change brightness on Windows 10 with the Action Center slider, Settings, keyboard keys — and add a slider for a desktop or external monitor that has none.
Read guideHow to Control External Monitor Brightness on Windows
Change the brightness of an external monitor from Windows using DDC/CI software, with setup steps and checks for cables, docks and monitor menus.
Read guideHow to Control Multiple Monitor Brightness
Match and control brightness across two or three monitors on Windows, with a calibration routine, hotkey tips and fixes for stubborn screens.
Read guideHow to Use a Brightness Slider on Windows
Set up and use a brightness slider on Windows, from the built-in panel to a tray utility with per-display sliders and keyboard shortcuts.
Read guideHow to Dim a Computer Screen on Windows
Dim a Windows computer screen for night work: lower the backlight, reduce contrast, use Night light and go below the minimum with software dimming.
Read guideFix Brightness Control on Windows 11
Troubleshoot Windows 11 brightness problems: missing or greyed-out slider, unresponsive keys, levels changing by themselves, and driver fixes.
Read guideFix External Monitor Brightness on Windows
A step-by-step fix list for external monitor brightness on Windows: DDC/CI settings, cables, docks, drivers and conflicting utilities.
Read guide
Looking for software instead? See the download page or the comparisons.