What BitLocker does and why you might want to turn it off

BitLocker is Windows encryption that scrambles everything on your hard drive so that if someone steals your device, they cannot read your files without a password. It runs in the background on many Windows computers, especially newer ones and those used for work.

You might want to turn it off because it slows down older computers, because you are moving your drive to a different machine, because you forgot your recovery key and cannot access your files, or straightforward because you do not want the overhead. Turning it off is straightforward, but it takes time — Windows has to unscramble your entire drive, which can take hours on a large one.

The process is different depending on whether you remember your BitLocker password and whether you are using Windows Pro, Enterprise, or Home edition. Home edition does not include BitLocker at all, so if you have Home, you do not have it running.

Key Takeaways

  • BitLocker is encryption that scrambles your hard drive; turning it off unscrambles everything, which takes hours on a full drive.
  • You need your BitLocker password or recovery key to start the process — if you have neither, you will need to contact your IT department or Microsoft support.
  • The fastest way to turn it off is through Settings > System > BitLocker on Windows Pro or Enterprise, then click "Turn off".
  • Once you click "Turn off", Windows will begin decryption in the background and your computer will be slower until it finishes.
  • You can check progress by opening Settings > System > BitLocker and looking at the decryption percentage.

Turning off BitLocker when you know your password

Open Settings by pressing the Windows key and typing "Settings", then press Enter. Click System on the left side, scroll down, and click BitLocker. You will see a blue toggle or a button that says "Turn off" next to "BitLocker encryption".

Click that button. Windows will ask you to confirm and may ask for your password or PIN. Enter it, then click Next. Windows will show you a screen asking whether you want to decrypt the drive now or wait until the next restart — choose "Decrypt the drive now" unless you need your computer for something urgent right away.

Click Next again. Your computer will begin decryption. You can keep using it, but it will be noticeably slower while decryption happens. Do not shut down or restart your computer during this time, or decryption will pause and restart when you turn it back on.

What to do if you do not have your BitLocker password

If you do not remember your password or PIN, you will need your recovery key — a long string of numbers that Microsoft gave you when BitLocker was first turned on. Check your email for a message from Microsoft, or look in your Microsoft account at account.microsoft.com under "Device" or "Security".

If you find your recovery key, go to Settings > System > BitLocker, click "Turn off", and when Windows asks for your password, click "I forgot my PIN" or "I do not have my password". Enter your recovery key instead. The rest of the process is the same.

If you cannot find your recovery key and do not remember your password, you cannot turn off BitLocker yourself. Contact your IT department if this is a work computer, or contact Microsoft support if it is a personal device. They may be able to help you recover access, but the process is slow.

Checking decryption progress and what to expect

Once decryption starts, go back to Settings > System > BitLocker. You will see a percentage showing how much of your drive has been decrypted. On a full 500 GB drive, this can take 4 to 12 hours depending on your computer's speed.

Your computer will work during decryption, but noticeably slower — opening programs will take longer, and copying files will be sluggish. If you need to use your computer heavily, you can pause decryption by clicking "Pause" in the BitLocker settings, then resume it later. Decryption will also pause automatically if you unplug a laptop.

Once decryption reaches 100 percent, BitLocker is off. You will not see the BitLocker option in Settings anymore, and your drive is no longer encrypted.

Why decryption takes so long

BitLocker scrambles every single file on your drive using a mathematical key. Turning it off means Windows has to read every file, unscramble it, and write it back — a process that touches every part of your hard drive. On a solid-state drive (SSD), this is faster. On an older mechanical hard drive, it is much slower.

You cannot speed this up. The only way to make it faster is to delete files before you start decryption, which reduces the amount Windows has to unscramble. If your drive is nearly full, deleting large files or programs you do not need can cut decryption time in half.

Turning BitLocker back on later

If you turn BitLocker off and later want to turn it back on, go to Settings > System > BitLocker and click "Turn on". Windows will encrypt your drive again, which takes the same amount of time as decryption. You will be asked to create a new password or PIN.

You can also choose to save your recovery key to your Microsoft account, to a USB drive, or to a file. Saving it is important — if you lose access to your password later, the recovery key is the only way to get back in.

Frequently Asked Questions

Can I use my computer while BitLocker is decrypting?

Yes, but it will be slow. Decryption happens in the background and does not require you to do anything, but your computer will be noticeably sluggish while it runs. If you need to do something that requires speed, you can pause decryption, do your work, and resume it later.

What happens if I restart my computer during decryption?

Decryption will pause and resume when you turn the computer back on. It will not damage your files or start over from the beginning — it will pick up where it left off. However, restarting multiple times will make the overall process take longer.

Do I need to turn off BitLocker before replacing my hard drive?

If you are moving your current drive to a different computer, yes — turn it off first so the new computer can read the drive. If you are replacing the drive with a new one, you do not need to turn off BitLocker on the old drive, but you should turn it off on the new one if you do not want encryption.

Will turning off BitLocker delete my files?

No. Decryption unscrambles your files in place — they stay on your drive, just no longer encrypted. All your programs, documents, and settings remain exactly as they were.

What if BitLocker is not showing up in my Settings?

You likely have Windows Home edition, which does not include BitLocker. You can check by pressing the Windows key, typing "winver", and pressing Enter — it will show your Windows edition. If you have Pro or Enterprise, BitLocker should appear in Settings. If it does not, try restarting your computer.