What authorizing a computer with iTunes actually does

Authorizing a computer with iTunes means telling Apple that this particular computer is allowed to play music, movies, and other content you bought from the iTunes Store using your Apple ID. When you buy something from iTunes, Apple attaches it to your account. Without authorization, a different computer can't play that content — even if you log in with the same Apple ID.

Think of it like a library card. Your Apple ID is the card itself. Authorization is the library saying "yes, this specific computer can check out books under that card." You can authorize up to five computers at once. If you try to use a sixth computer, you have to deauthorize one of the old ones first.

This matters most if you buy music or movies from iTunes, or if you use iTunes to sync content to an iPhone or iPad. If you only stream music through Apple Music or Spotify, you probably don't need to authorize anything — those services work differently.

Key Takeaways

  • Authorization links your iTunes purchases to a specific computer so you can play them there.
  • You authorize through the Account menu in iTunes on Windows or Mac, or through System Settings on newer Macs.
  • You can authorize up to five computers total; authorizing a sixth computer requires deauthorizing an old one first.
  • If you sell or give away a computer, deauthorize it before you hand it over so the new owner can't access your purchases.
  • Authorization is separate from logging in — you need to do both for iTunes to work properly.

How to authorize on Windows or older Mac versions

Open iTunes on the computer you want to authorize. In the menu bar at the top, click Account (on Windows) or iTunes (on Mac), then select Authorizations or Sign In. You should see an option that says Authorize This Computer.

Click it. iTunes will ask you to sign in with your Apple ID — the same one you used to buy the content. Enter your email address and password, then click Authorize. A message will appear saying the computer is now authorized. That's it. You can now play your iTunes purchases on this computer.

If you don't see an Authorize option, check that you're actually logged into iTunes with your Apple ID. Look at the top of the iTunes window — you should see your name or email address. If you see "Sign In" instead, click that first and enter your credentials.

How to authorize on newer Mac computers

On a Mac running macOS Monterey or later, iTunes was replaced by the Music app. Open Music from your Applications folder. In the menu bar, click Music, then Account, then Authorizations. Select Authorize This Computer.

Sign in with your Apple ID when prompted. The computer is now authorized. You can close the window and start playing your purchases.

If you're not sure which macOS version you have, click the Apple menu in the top-left corner and select About This Mac. Look for the version number. If it says 12.0 or higher, use the Music app method above. If it's 11.x or lower, use the iTunes method in the previous section.

What to do if you can't authorize

The most common reason authorization fails is that you're not logged in with the right Apple ID. Check the account menu again and make sure the email address shown matches the one you used to buy the content. If you have multiple Apple IDs, you may have purchased content under a different one.

Another reason is that you've already authorized five computers. iTunes will tell you this when you try to authorize. To fix it, you need to deauthorize one of the old computers first. If you still have access to that computer, open iTunes or Music on it, go to Account > Authorizations, and click Deauthorize This Computer. Then go back to the new computer and authorize it.

If you no longer have access to one of the five authorized computers — because you sold it, it broke, or you forgot where it is — you can deauthorize all five at once through your Apple ID account online. Go to appleid.apple.com, sign in, scroll to Security, and look for Manage your Devices or iTunes in the Cloud. You should see an option to deauthorize all computers. After you do this, you can authorize your current computer again.

Deauthorizing a computer you're selling or giving away

Before you hand over a computer to someone else, deauthorize it so they can't access your iTunes purchases. Open iTunes or Music, go to Account > Authorizations, and click Deauthorize This Computer. Enter your Apple ID password if prompted. The computer is now deauthorized.

This is important for privacy and security. Even though the new owner won't be able to play your purchases, they could potentially see that you bought them. Deauthorizing removes that link.

If you're wiping the computer completely before selling it, deauthorize it first, while you still have your Apple ID logged in. It only takes a few seconds and saves the new owner from running into authorization errors later.

Authorization vs. signing in — what's the difference

Signing in means entering your Apple ID and password into iTunes or Music. This logs you into your account so the app knows who you are. Authorization is a separate step that tells Apple this specific computer is allowed to use your purchases.

You need both. If you sign in but don't authorize, you can see your library and read your purchases, but you won't be able to play them. If you authorize but don't sign in, the app won't know which account's purchases to unlock. In practice, iTunes usually prompts you to do both at the same time, so you may not notice they're separate steps.

When you don't need to authorize

If you use Apple Music, Spotify, YouTube Music, or another streaming service, you don't authorize computers. Those services work by streaming — the music plays from their servers, not from files stored on your computer. You just sign in with your account and listen.

Authorization only matters for content you own outright: music or movies you bought from iTunes, or content you imported from CDs. If all your music comes from a streaming service, you can skip authorization entirely.

Frequently Asked Questions

Can I authorize the same computer twice with different Apple IDs?

Yes. You can authorize a computer with multiple Apple IDs, and each one can play their own purchases on that computer. Just sign in with the second Apple ID and authorize again. The computer will now be authorized for both accounts.

What happens if I authorize a computer and then forget my Apple ID password?

The authorization stays active. You can still play your purchases on that computer. If you later need to deauthorize it or authorize a different computer, you'll need to reset your password at iforgot.apple.com first.

Do I need to authorize my iPhone or iPad?

No. iPhones and iPads authorize differently — they use your Apple ID and iCloud. You only authorize computers running iTunes or Music on Mac and Windows.

If I authorize a computer, can someone else use it to play my purchases?

Yes, anyone who uses that computer can play your iTunes purchases. Authorization is tied to the computer, not to a specific user account on that computer. If privacy is a concern, deauthorize before letting someone else use the computer.

How long does authorization last?

Authorization lasts indefinitely until you deauthorize the computer. You don't have to renew it or log in again. As long as the computer is authorized and you're signed in with the right Apple ID, you can play your purchases.