What changing your computer name means and why you might do it

Your computer name is the identifier that appears on your network and in system settings — it's what other devices see when they look for shared files or printers on your home network. By default, Windows assigns a random string of letters and numbers, and Mac uses a variation of your account name. Changing it to something you recognize makes it easier to find your machine when connecting to printers, backing up to network storage, or troubleshooting network problems.

You might rename your computer when you set it up for the first time, when you inherit a used machine, or when you want to distinguish between multiple devices in your home. The process is straightforward and takes a few minutes, though you'll need to restart your computer afterward for the change to take effect.

Key Takeaways

  • On Windows, you change your computer name through Settings > System > About, then click "Rename this PC" and enter your new name.
  • On Mac, go to System Settings > General > About, click the "Edit" button next to the computer name field, and type your new name.
  • Both operating systems require you to restart your computer after renaming it for the change to apply across your network.
  • Computer names can include letters, numbers, and hyphens, but not spaces or special characters like @ or #.
  • Renaming your computer does not affect your files, accounts, or installed programs — it only changes how the device identifies itself.

Renaming a Windows computer

On Windows 10 or 11, open the Settings app by pressing the Windows key and typing "Settings," then pressing Enter. Navigate to System in the left sidebar, then scroll down and click About. You'll see your current computer name listed under "Device name."

Click the button labeled Rename this PC. A text box will appear with your current name highlighted. Delete the existing text and type your new name. Use only letters, numbers, and hyphens — spaces and special characters will cause an error. Once you've entered your new name, click Next.

Windows will ask you to restart your computer. You can choose to restart now or restart later, but the name change won't take effect until you do restart. If you restart later, do so within the next few hours to avoid confusion on your network. After the restart completes, your computer will use the new name.

Renaming a Mac computer

On macOS, click the Apple menu in the top-left corner and select System Settings (or System Preferences on older versions). In the sidebar, click General, then click the About tab. You'll see your current computer name listed as "Computer Name" near the top of the window.

Click the Edit button next to the computer name field. A text box will become active. Select all the existing text and replace it with your new name. Again, use only letters, numbers, and hyphens. Click Done when you're finished.

Unlike Windows, Mac doesn't require an immediate restart, but the name change may not appear on your network until you restart. If you're connecting to network printers or shared drives right away, restart your Mac to ensure other devices recognize the new name immediately.

What you can and cannot use in a computer name

Computer names have character restrictions because they need to work across different networks and devices. You can use uppercase and lowercase letters (A–Z, a–z), numbers (0–9), and hyphens (-). The name can be up to 15 characters on Windows and up to 63 characters on Mac.

You cannot use spaces, periods, underscores, or special characters like @, #, $, %, &, or !. If you try to enter any of these, your operating system will reject the name and ask you to try again. A good approach is to use hyphens to separate words — for example, "Living-Room-Mac" or "Home-Office-PC" — rather than trying to use spaces.

What happens after you rename your computer

After the rename takes effect, your computer will appear under the new name on your home network. If you have a printer connected to your network, you may need to remove and re-add it so your computer can find it under the new device name. The same applies to network-attached storage or other shared devices — they'll recognize your computer by its new identifier.

Your files, user accounts, installed programs, and settings remain unchanged. Renaming your computer does not affect backups, cloud sync services like OneDrive or iCloud, or any of your personal data. If you're signed into a Microsoft account on Windows or an Apple ID on Mac, those connections continue to work normally.

Renaming a computer on a work or school network

If your computer is connected to a workplace or school network managed by an IT department, you may not have permission to rename it. Attempting to rename a domain-joined computer will usually fail with a permissions error. Contact your IT support team — they may need to rename the computer from their end or provide you with a different process.

Home networks and personal computers have no such restrictions, so you can rename freely. If you're unsure whether your computer is part of a managed network, check with whoever manages your network or your IT department before attempting the rename.

Frequently Asked Questions

Do I have to restart my computer for the name change to work?

On Windows, yes — the system will prompt you to restart and the name won't take effect until you do. On Mac, a restart isn't required immediately, but other devices on your network may not recognize the new name until you restart. It's safest to restart both systems within a few hours of renaming.

Can I change my computer name back to the original?

Yes, you can rename your computer as many times as you want using the same process. There's no limit to how many times you can change it, and no permanent record of previous names. Just go back to Settings and follow the same steps with your new desired name.

Will changing my computer name affect my passwords or login?

No. Your user account password and login remain the same. The computer name is separate from your account credentials. You'll still log in the same way, and all your passwords for websites and services continue to work normally.

What if I see an error message when I try to rename?

The most common error is using invalid characters like spaces or special symbols. Delete those and use only letters, numbers, and hyphens. If you're on a work network, you may lack permission to rename — contact your IT department. If the error persists, restart your computer and try again.