Disable Windows 11 Rounded Corners: 5 Ways

If you want to turn off the rounded corners on Windows 11 windows, you can do so by using a third-party app like Win11DisableOrRestoreRoundedCorners or by editing the system registry with a custom value. There is no built-in toggle in Settings, so you must use one of these workarounds to restore sharp, square corners.

Why Windows 11 Has Rounded Corners

Rounded corners are a core part of Windows 11’s “Fluent Design” language, introduced alongside the new Start menu, centered taskbar, and acrylic materials. Microsoft chose rounded corners to soften the interface and make it feel more modern and approachable compared to the sharp edges of Windows 10. The corners are rendered by the Desktop Window Manager (DWM), the same system component that handles visual effects, transparency, and window animations. Because the rounding is applied at the DWM level, there is no per-app setting to disable it—it affects all standard Win32 and UWP windows globally.

Method 1: Use Win11DisableOrRestoreRoundedCorners (Easiest)

The most straightforward way is to download a small open-source utility called Win11DisableOrRestoreRoundedCorners. It is a portable tool that does not require installation. Here is how to use it:

1. Download the latest release from the developer’s GitHub page (search for “Win11DisableOrRestoreRoundedCorners”).
2. Extract the ZIP file to a folder, then run the executable (usually named Win11DisableOrRestoreRoundedCorners.exe).
3. Click the Disable rounded corners button. The change takes effect immediately—you do not need to restart your PC.
4. To re-enable rounded corners, run the same tool and click Restore rounded corners.

This tool works by modifying a specific registry key that controls the corner radius. It is free, open-source, and widely used. Because it only changes a visual setting, it does not affect system stability or performance.

Method 2: Manual Registry Edit (No Extra Software)

If you prefer not to download anything, you can manually edit the registry. The relevant key is:

HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM

Here are the steps:

1. Press Win + R, type regedit, and press Enter.
2. Navigate to the path above.
3. Right-click on the right pane, choose New → DWORD (32-bit) Value.
4. Name it CornerRadius.
5. Double-click it, set the value to 0 (zero) to disable rounding, then click OK.
6. Restart your PC or sign out and back in for the change to take effect.

To restore rounded corners, either delete the CornerRadius value or set it back to 1 (the default). Note that this registry value is not officially documented by Microsoft, so it may not work in every Windows 11 build—especially after major feature updates.

Method 3: Use a Third-Party Theme or Visual Style

Another approach is to apply a custom Windows theme that uses square corners. Tools like UXThemePatcher or SecureUxTheme allow you to load third-party visual styles that can override DWM’s corner rounding. These themes often include a “Classic” or “Windows 10” style that renders windows with sharp corners.

However, this method is more invasive: it patches system files and can break with Windows updates. It also requires you to download and install themes from third-party sources, which carries a small security risk. Only use this if you are comfortable with system file modification and have a backup of your system.

Method 4: Disable Animations (Partial Fix)

If your goal is simply to reduce the visual effect of rounded corners (for example, to make screen recording look cleaner), you can disable window animations. This does not remove the rounding, but it removes the smooth transition when windows open, close, or snap, which can make the corners appear less prominent.

1. Open Settings → Accessibility → Visual effects.
2. Toggle off Animation effects.

This is not a true fix, but it is a built-in option that requires no third-party tools.

Common Problems and Troubleshooting

• Registry edit does nothing: If you set CornerRadius to 0 but corners remain rounded, your Windows build may have removed support for that value. Try the third-party tool instead—it often uses a different method (like patching DWM in memory) that works on more builds.
• Rounded corners return after update: Windows feature updates can reset DWM settings or change how the registry key is read. You will need to reapply the fix after major updates.
• Some apps still have rounded corners: Certain apps (like Microsoft Edge or the new Notepad) draw their own window frames and ignore the global DWM setting. For those, you may need to disable the app’s own rounded-corner setting (if it has one) or use a per-app compatibility setting.
• Tool is flagged by antivirus: Because the tool modifies registry values and may use undocumented APIs, some antivirus programs may flag it as a hacktool. This is usually a false positive, but always download from the official GitHub release page.

How to Choose the Right Method

Your choice depends on how comfortable you are with system modifications and how often you want to reapply the fix.

• Easiest and reversible: Use the Win11DisableOrRestoreRoundedCorners tool. It is one click, and you can restore instantly.
• No third-party software: Use the manual registry edit. It is simple but may not survive updates.
• Long-term customization: Use a custom theme if you want a full Windows 10 look, but be prepared for update issues.
• No permanent change: Disable animations if you only need a temporary visual reduction.

Safety and Risks

All these methods modify system settings or files. The registry edit and the third-party tool are relatively safe because they only change a visual preference—they do not touch system files. However, editing the registry incorrectly can cause instability, so always back up the registry before making changes (right-click on the DWM key → Export). Custom theme patching is riskier: it replaces system files (like uxtheme.dll), which can trigger Windows Update failures or system crashes if not done correctly. Always create a system restore point before using theme patchers.

Frequently Asked Questions

Does disabling rounded corners improve performance?

No. The corner rounding is a simple visual effect that uses negligible GPU resources. You will not see any measurable performance improvement, even on low-end hardware.

Will the registry hack work on Windows 11 24H2 or future updates?

It is uncertain. Microsoft has not officially documented the CornerRadius value, and they may change or remove it in future builds. The third-party tool is more likely to be updated by its developer to support new versions, so check for updates if the hack stops working.

Can I disable rounded corners for only one app?

No, the DWM setting applies globally. Some apps have their own settings (like Edge’s “use rounded corners” flag), but there is no system-wide per-app override.

Is there a built-in Windows 11 setting to turn off rounded corners?

No. Microsoft does not provide a toggle in Settings or Control Panel. The only built-in option is to disable animations, which does not remove the rounding itself.

Will these methods affect system stability?

The registry edit and the third-party tool are safe and reversible. Custom theme patching can affect stability if done incorrectly, so follow instructions carefully and create a restore point first.

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