A BitLocker recovery key is a 48-digit number used to unlock the drive when Windows cannot unlock it automatically.
To find it:
- On the BitLocker recovery screen, note the first 8 digits of the recovery key ID.
- Check whether the key is saved in the Microsoft account used on that PC:
- Open https://aka.ms/myrecoverykey
- Sign in and match the key ID shown there to the one on the locked computer
- Use the related 48-digit recovery key to unlock the drive
- If that PC was ever signed in with a work or school account, check:
- https://aka.ms/aadrecoverykey
- Sign in, go to Devices, expand the device, and select View BitLocker Keys
- Check for a printed copy of the recovery key.
- Check a USB flash drive if the key was saved there.
- If someone else set up the device or turned on BitLocker, the key might be in that person’s Microsoft account.
Important facts:
- Microsoft Support cannot retrieve, provide, or recreate a lost BitLocker recovery key.
- If the device is managed by an organization, contact the IT department.
- If the recovery key cannot be found, the remaining option is to reset the device using Windows recovery options. Warning: resetting removes all files.
References: