How to Block Untrusted Fonts on Windows 10?

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Do you want to block untrusted fonts on Windows 10 to protect your operating system from attackers?

Windows allows you to install custom fonts from external sources and while this feature is fantastic, it can harm your operating system as well.

Some fonts are untrusted, and the attackers might deploy malicious codes through the external font files to damage your system. The easiest yet effective way to prevent such attacks is to block untrusted fonts on Windows 10. By doing so, the fonts installed outside of the default fonts folder will be disabled.  

If you are looking for ways to do so, you are in the right place. 

We have listed a few easy methods that will help you block untrusted fonts on Windows 10 in no time. 

Let’s dive right in!

1. Use the Group Policy Editor. 

Windows comes with several administrative-level tools and features that allow the users to customize Windows operations according to their requirements. Administrators can control the working environment of Windows, which comes in handy if you, as a network administrator need to enforce specific rules on the computer for other users. 

One such feature is the Group Policy Editor (GPE), and if you want to block untrusted fonts on Windows 10, an effortless way of doing so is via GPE.

Here is how you can do it:

  1. Open a Run dialogue box by pressing Windows + R keys simultaneously.
  2. Inside the text field of the dialogue box, type ‘gpedit.msc’ and hit Enter. Doing so will open the Local Group Policy Editor.
  1. Inside the Group Policy Editor, navigate to the location mentioned below. 
Computer Configuration\Administrative Templates\System\Mitigation Options
How to Block Untrusted Fonts on Windows 10
  1. In the right pane, locate Untrusted Font Blocking and double-click on it.
  2. Choose Enabled and click on Apply/OK to save the changes. 

That’s it. Doing so will block the untrusted fonts on Windows 10 successfully. 

2. Use Windows Registry. 

Windows Registry is another administrative-level tool that allows the administrators to tweak Windows settings according to their requirements. It stores low-level information about installed applications and user accounts. The operating system refers to this information when performing relevant tasks.

Here is how you can use Windows Registry to block untrusted fonts on Windows 10:

  1. Open a Run dialogue box by pressing Windows + R keys simultaneously. 
  2. Type ‘regedit’ in the text field of the dialogue box and hit Enter. Doing so will launch the Registry Window. 
  1. Inside the Registry Editor, navigate to the location mentioned below.
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\MitigationOptions
How to Block Untrusted Fonts on Windows 10
  1. If you cannot locate the MitigationOptions key, then right-click on the Windows NT folder and choose the New > Key.
  2. Name this new key as MitigationOptions and double-click on it.
  3. In the right pane, right-click anywhere and choose the New > String Value value. 
  4. Name this string as MitigationOptions_FontBocking.
  5. Double-click MitigationOptions_FontBocking, and under Value data, type 1000000000000.

Hopefully, this will block the untrusted fonts on Windows 10. 

3. Try Using CleanMyPC.

If the methods mentioned in this guide are not working for you, then there is a chance that your system is infected with a corruption error that is preventing you from executing certain operations. 

In this case, we recommend deep cleaning your system first and then proceeding with the methods we have mentioned. While there are several methods of doing so, using a PC cleaner is the fastest and most efficient way of cleaning your PC. 

If you haven’t used a PC cleaner before or the ones you have did not bring expected results, then we highly recommend trying CleanMyPC

Install CleanMyPC on your PC

CleanMyPC is a reliable cleaner that can help eliminate junk files from your PC in no time. But that isn’t it. 

It comes with a wide range of system maintenance tools capable of handling all your PC-related issues like slow speed, sluggish performance, and even online privacy concerns. All that you need to do is install the tool and run a scan using it. It will identify the issues and attempt to resolve them with little to no user input. 

Install CleanMyPC now and give your PC a much-needed performance boost!


Try CleanMyPC Now!


4. FAQ: How to View the Event Log.

If you choose to turn on the Audit mode to check if blocking the untrusted mode on Windows 10 causes any compatibility issues, you will need to check the event log for details. 

Here is how you can do that:

  1. Open a Run dialogue box by pressing Windows + R keys simultaneously.
  2. Type ‘eventvwr.exe’ in the text field of the dialogue box and hit Enter.
  3. Now navigate to the location mentioned below.
Application and Service Logs/Microsoft/Windows/Win32k/Operational
How to Block Untrusted Fonts on Windows 10
  1. Finally, click on any of the events from the list to see the details.

This should help you identify the issues caused by blocking the untrusted mode on your operating system. 

This brings us to the end of our guide on ways to block untrusted fonts on Windows 10. We hope that one of the solutions we mentioned worked for you. If you still have any questions, please let us know in the comment section below. We will try our best to assist you!

If this guide helped you, please share it. 🙂

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