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

  Step-by-step ways to adjust brightness on Windows 11: Quick Settings, Settings, keyboard keys, and options for external monitors.

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• How to Adjust Brightness on Windows 10

  Adjust brightness on Windows 10 using the Action Center, Settings, Mobility Center or laptop keys, plus options for desktop monitors.

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• How 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.

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• How 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.

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• How 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.

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• How 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.

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• Fix Brightness Control on Windows 11

  Troubleshoot Windows 11 brightness problems: missing or greyed-out slider, unresponsive keys, levels changing by themselves, and driver fixes.

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• Fix 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.

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Looking for software instead? See the download page or the comparisons.