How To Add A Brightness Slider In Windows 10
The Windows 10 brightness slider is more accessible than many users realize. On supported Windows 10 devices — particularly laptops, tablets, and other machines with built-in displays — a native brightness slider is available directly from the taskbar flyout (click the network, volume, or battery icon cluster near the system clock) and from Settings > System > Display. However, as Microsoft Support notes, this built-in slider often does not appear on desktop PCs or for external monitors. If your setup falls into that category, or if you want more granular, always-visible control from the system tray, a free open-source tool called Win 10 Brightness Slider can fill that gap nicely.
Win10 Brightness Slider is portable. You don’t need to install it. Just download the app, and run it. It will add a brightness icon to the system tray that fits in perfectly with the power/battery, WiFi, and volume controls. This makes accessing your Windows 10 brightness slider as convenient as adjusting the volume.
How to use the built-in Windows 10 brightness slider
If you are on a laptop or a device with a built-in screen, Windows 10 already includes a brightness slider you can reach in two quick ways:
- Taskbar flyout: Click the notification/Action Center area in the bottom-right corner of the taskbar (the cluster that shows your network, volume, and battery icons). If your device supports it, a Brightness slider will appear alongside the other quick-action tiles. Drag it left or right to dim or brighten your display.
- Settings app: Go to Settings > System > Display. At the top of the Display page you will see a Brightness and color section with a slider you can adjust directly.
These native controls work best on laptop screens and other built-in displays. If you are using a desktop PC or an external monitor, you may find that neither of these paths shows a brightness slider at all — which is where the troubleshooting steps below come in.
If the Windows 10 brightness slider is missing
Not seeing any brightness slider in Windows 10 is a common problem, and there are a few concrete things to check before reaching for a third-party app:
- Check your display type: Windows 10 does not natively expose a brightness slider for most external monitors. If you are on a desktop PC connected to an external display, the built-in slider will typically not appear in Settings or the taskbar flyout.
- Verify Settings > System > Display: Open the Settings app, go to System, then Display, and look for the Brightness slider under the Brightness and color heading. If it is not there, your system or driver may not support native brightness control.
- Update or reinstall your graphics drivers: Missing brightness controls are often a driver issue. Visit your laptop manufacturer’s support page or your GPU vendor’s website (Intel, NVIDIA, or AMD) to download and install the latest driver. After reinstalling, restart your PC and check again.
- Enable DDC/CI on your external monitor: If you are using an external monitor and want software to control its brightness, you need to enable DDC/CI in the monitor’s own on-screen display (OSD) menu. This is usually found under the monitor’s Settings or Advanced section. Without DDC/CI enabled, no Windows tool — native or third-party — can communicate brightness commands to the display.
- Use the app’s monitor rescan feature: If you are using Win10 Brightness Slider and you have recently docked, undocked, or connected a new monitor, use the app’s monitor detect or rescan option from the system tray icon to prompt it to re-detect connected displays.
Compatibility with external monitors and multiple displays
Win10 Brightness Slider is most reliable in two scenarios: laptop internal panels and DDC/CI-enabled external monitors. Understanding which category your setup falls into will save you a lot of troubleshooting time.
For external monitors, DDC/CI (Display Data Channel/Command Interface) is the communication protocol that allows software on your PC to send brightness commands to the display. You must enable DDC/CI in your monitor’s on-screen menu before the app — or any third-party brightness tool — can control it. Most modern monitors support this feature, but it is turned off by default on some models.
When multiple monitors are connected, Win10 Brightness Slider provides separate sliders for each detected display, so you can set different brightness levels for each screen independently. This is a significant advantage over Windows’ native controls, which only target built-in displays.
There are some setups where brightness control through software may not work reliably regardless of the tool you use: monitors connected through certain docking stations, KVM switches, or passive display adapters can block the DDC/CI signal, making software brightness adjustment impossible. In those cases, you will need to adjust brightness manually using the physical buttons on your monitor. Updated graphics drivers from your GPU vendor are also often required for the app to correctly detect and control monitors, so keeping those current is always a good first step.
Windows 10 Brightness Slider Tool
Click the brightness icon and a slider will appear. You can drag the slider knob and increase or decrease the brightness. Like the volume slider in Windows 10, the brightness slider gives you numerical values for how dim or how bright your screen is — you have a scale that goes from 1 to 100. This level of precision is something the default controls simply don’t offer.
Compared to the slider, the default Windows 10 brightness HUD doesn’t give you as fine a control. The function keys on your laptop control the HUD and they manage the brightness in fixed increments. If you need precise control over your display’s brightness level, those fixed steps can be frustrating to work with.
In the screenshot below, you can see the default brightness HUD on the left, and the slider that Win10 Brightness Slider adds on the right. The slider is a lot easier to manage and gives you far more granular control over your display output.
It’s actually a slight improvement on the Control Panel’s brightness slider because it gives you numerical values for the current brightness levels. Whether you’re working in a bright room or a dark environment, being able to set an exact brightness percentage makes a real difference to eye comfort.
Limitations of the Windows 10 Brightness Slider
While Win10 Brightness Slider works great, it does have one limitation. If you use the brightness slider in Control Panel, or if you use the Function keys to change the brightness of your screen, the slider will not update to reflect the new brightness levels. It doesn’t interfere with the default brightness controls, and the default brightness controls do not prevent the app from working. The only limitation is that the app doesn’t update when you use the default controls to change screen brightness.
If however you use Win10 Brightness Slider to change the brightness of your screen, both the Control Panel slider and the Windows 10 default brightness HUD will reflect the new level that has been set. This one-way sync is a minor inconvenience but doesn’t affect the app’s core usefulness.
You can run Win10 Brightness Slider on system startup so that your Windows 10 brightness slider is always available from the moment you log in. The app might show a ‘Not Supported’ error when you try to run it. If you get this error, the developer advises that you run the following command in PowerShell;
$monitor = Get-WmiObject -ns root/wmi -class wmiMonitorBrightNessMethods$monitor.WmiSetBrightness(80,10)
If that doesn’t work, your display drivers may need to be updated. You can check for the latest drivers through your laptop manufacturer’s support page or via Windows Update. Barring these two solutions, if the app doesn’t work there is no recourse for you.
* fixed:it updates old values now.
* has ddc/ci support. if wmi is not supported. supports some seperate desktop monitors