PC security is not just about having antivirus software on your computer. You should also restrict access to your documents on your PC while you're away from your machine.

Read on to explore how you can automatically lock your PC after a set time, even when you leave it unattended.

How to Keep Your Windows PC Inaccessible While Your Gone

There are lots of places you could use a PC or laptop. It could be in the office, at a conference venue, or on the go at your favorite café. And there'll be times you just need to get up to attend to something pressing.

Fortunately, you can set your PC to lock automatically after a custom amount of time without activity. This means you can safely leave your work desk, knowing your work is safe from prying eyes.

Of course, you can also lock your PC manually when you walk away from it—just press the Win + L keys together or Ctrl + Alt + Del and then sign out. But you could miss doing that in a rush, or if you're distracted.

Instead, check out these methods to configure your Windows PC to lock automatically when there is no activity after a specific amount of time.

1. How to Lock Your Windows PC After a Set Time via the Local Security Policy

Using the Local Security Policy, you can set the exact time in seconds after which your PC will lock itself automatically. Make sure you're signed in as an administrator to automatically lock your PC.

1. Type Local Security Policy in Windows Search. Click the Local Security Policy under Best match to open it. Alternatively, press the Win + R keys together to open the Run box. Type secpol.msc in the Open navigation bar and click OK or hit Enter to launch it.

   

2. Click the down arrow next to Local Policies in the left pane to expand it.
3. Click on Security Options to open it.
4. The Security Options will open up in the right pane. Now scroll down to the policy named Interactive logon: Machine inactivity limit and double-click on it to open its properties.

   

5. Under the section Machine will be locked after, enter the time in seconds after which you want your PC to get locked automatically. This time is the time of machine inactivity or the time when your PC is idle. You can enter the time between 0 to 599940 seconds. For this tutorial, we'll enter 300 seconds which is five minutes. Now click on Apply and then OK.
6. Finally, close the Local Security Policy window and restart your computer for the change to take effect.

Now, when you use your PC, you will experience that your PC will lock itself after your custom timer expires. And if someone tries to unlock your PC while you're gone, it'll ask them for your password, which should keep them at bay until you get back.

If you ever want to reverse this action and not have your PC lock automatically, just open the Interactive logon: Machine inactivity limit policy in Local Security Policy. Then just change the time or seconds to 0—this is the default setting and will not lock your PC automatically.

2. How to Lock Your Windows PC After a Specific Amount of Inactivity via the Registry Editor

You can tweak settings in the Registry Editor to configure your PC to lock automatically after a set time. And you can do this in Windows Home and all the other Windows editions.

However, you must be careful while making changes in the registry and should only make the changes as detailed below and not change anything else. It'd be a good idea to create a restore point in Windows before you change your registry settings. If something goes wrong, you can revert your PC to its last working state.

Now let's go ahead and explore how to lock your PC automatically via the Registry Editor.

1. Type Registry Editor in Windows Search and select Registry Editor under Best match. Or use one of the many ways to open the Registry Editor in Windows 11.
2. Click on Yes on the UAC prompt.
3. In the left pane, use the following path to reach the System registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

   

4. Click on the System key in the left pane and its components will open up in the right pane. Now scroll down to get to the InactivityTimeoutSecs DWORD.

   

5. Double-click on the InactivityTimeoutSecs DWORD to modify its value. Select Decimal under Base, and under Value data, enter a number between 0 to 599940—this is the time in seconds after which your PC will get locked automatically. Like in the Local Security Policy method, we'll give it a time of 300 seconds or five minutes. Now tap on OK.
6. In case you do not find the InactivityTimeoutSecs DWORD in your registry, you can create it. Right-click on the System key folder in the left pane or right-click on a space in the right pane of the System key. Select New, then select DWORD (32-bit) Value.

   

   A new value will be created in the right pane. Name it InactivityTimeoutSecs. Then press Enter.
7. Now double-click on InactivityTimeoutSecs DWORD, and enter the time after which you want your PC to get locked.
8. Finally, close the Registry Editor and restart your PC to apply the changes.

Now your PC will get locked if you're not using it or are away from it after the time you have set in the Registry Editor. If you're on a Windows 11 machine, you can also explore a few other ways to lock your PC.

To stop your PC from getting locked automatically, modify the InactivityTimeoutSecs DWORD value in the Registry Editor by changing the time to 0 seconds.

Work Worry-Free on Your Windows PC With a Custom Time-Out Lock

Now never be tense about someone getting access to your PC or your work getting stolen while you're away from your PC. Use one of the above methods to automatically lock your PC after a set time.

You can also explore how to set up Dynamic Lock using your phone to automatically lock your PC when you move away from it.