Questions About How to Decrypt A File

Q1: "I recently encrypted some of my files in Windows 10 and kept my encryption key in my Documents folder in C drive. I reinstalled Windows OS the other day, and the encryption key was lost due to formatting. Can I decrypt the file without the certificate?"

Q2: "Unknown viruses encrypted all files and folders on my USB pen drive. I was threatened to pay Bitcoin to recover encrypted files, which I don't want to. I need a way to decrypt encrypted files without a password."

In this article, we will provide a full guide on how to decrypt a file online without a key. And, if your files are encrypted by ransomware, use the robust data recovery tool and get your files back in a click.

Part 1. How to Decrypt a File Online Without Key/Certificate/Password

You can decrypt a file online without a key if you have the right tool. Advanced Encryption Standard(AES) is a symmetric encryption algorithm. Following is the example of generating an AES encrypted password and decrypt an AES encrypted password. 

decrypt a file online without password

Part 2. How to Decrypt a File Without Password/Key/Certificate Offline

You can decrypt the files system by unchecking the "Encrypt Contents to Secure Data" feature. But, this only works for the file system, not your specific file. If you want to decrypt files, the certificate or password is indispensable.

If you haven't exported and backed up the file encryption certificate before or if you have forgotten the password, you cannot decrypt encrypted files if you have done one of the following:

If you really need to decrypt files, many guides will advise you to try the online decryption tools. However, you need to be aware that these tools are not 100% safe. You may be at risk of data theft or source data corruption.

In addition to that, if users actively use tools to encrypt, there is another unexpected way of files being encrypted, which is by viruses or ransomware. For example, ransomware encrypts and deletes files. In the next part, we will show you how to use a reliable ransomware encrypted file recovery tool to get back data without paying the ransom.

related articles

Ransomware Data Recovery: How to Recover Ransomware Encrypted Files

Here, we’ll show you three helpful ways to recover files deleted or encrypted by ransomware like Locky, CryptoLocker, CryptoWall, or TorrentLocker, without paying anything.

virus workflow

Part 3. How to Recover Encrypted Files Locked by Ransomware

Since most ransomware encrypts your files and folders by three steps: make an exact copy of files and folders > encrypt the copy > delete the source files. How this works gives you a great opportunity to recover the encrypted files through professional data recovery software.

Here, we highly recommend you try EaseUS Data Recovery Wizard. This virus attack data recovery program enables you to recover files infected by shortcut virus, restore files deleted and encrypted by ransomware like Locky, CryptoLocker, CryptoWall, and TorrentLocker, without paying.

 Download for Win Recovery Rate 99.7%
 Download for Mac Trustpilot Rating 4.7

  • Recover lost or deleted files, documents, photos, audio, music, emails effectively
  • Recover files from SD card, emptied recycle bin, memory card, flash drive, digital camera, and camcorders
  • Support data recovery for sudden deletion, formatting, hard drive corruption, virus attack, system crash under different situations

Go ahead and download this capable data recovery tool and start to recover ransomware encrypted files within three steps. Note that this is just for file recovery of shortcut virus or ransomware, not including those by encryption tools.

Step 1. Select the virus infected drive to scan

Run EaseUS virus file recovery software on your Windows PC. Select the disk attacked by the virus to scan for lost or hidden files. Note that:

  • If it's an HDD where files were hidden or deleted by virus, it's better to install the software on a different volume or an external USB drive to avoid data overwriting.
  • If the infected device is an external hard drive, flash drive or memory card, it doesn't matter to install the software on the local drive of the computer.
select a location to scan

Step 2. Check all scanned results

EaseUS Data Recovery Wizard will immediately start a scan process to find your deleted or hidden files on the virus infected hard drive. To quickly locate the wanted files, you can use the Filter or search box feature to display only the pictures, videos, documents, emails, etc.

filter deleted or hidden files

Step 3. Preview and recover deleted/hidden files

When the process finishes, you can preview the scanned files. Select the files you want and click the "Recover" button. You should save restored files to another secure location or Cloud drive, not where they were lost.

Restore virus infected files

Consult with EaseUS Data Recovery Experts for one-on-one manual recovery service. We could offer the following services after FREE diagnosis:

  • Repair corrupted RAID structure, unbootable Windows OS and corrupted virtual disk file (.vmdk, .vhd, .vhdx, etc.)
  • Recover/repair lost partition and re-partitioned drive
  • Unformat hard drive and repair raw drive (BitLocker encrypted drive)
  • Fix disks that become GPT protected partitions

Part 4. How to Encrypt a File in Windows 10/8/7

We tend to protect privacy by using some file encryption tools, such as EFS (Encrypting File System), that provide the core file encryption technology used to store encrypted files on NTFS file system volumes. So, only with a certificate, people can access the EFS locked files.

encrypted file recovery

Steps to encrypt a file in Windows 10/8/7

Step 1. Find the file or folder you wish to encrypt.

Step 2. Right-click the file/folder and click "Properties." Then, click the "Advanced..." button on the General screen.

Step 3. Check the "Encrypt Contents to Secure Data" box under the Compress or Encrypt attributes section, then click the "OK" button.

Step 4. Click the "OK" button. An encryption warning box will pop up.

Step 5. Check the "Encrypt the File Only" box to encrypt the individual file, then click "OK" to finish.

Note: If you copy unencrypted files to a folder with encrypted property, they will be automatically encrypted.

how to encrypted files in Windows 10/8/7

EFS encryption is transparent. If you encrypt some data, you can access this data without any restriction. 

To Sum It All Up

You can use EFS or Bitlocker to encrypt your files and data. But, to avoid losing the password, key, or certificate and not being able to decrypt files, we suggest you back up your encryption certificates and keys to a safe location, and remember your EFS backup password.

For solving the encryption problem caused by ransomware, the most important thing is preventing the virus infection. Install and enable the anti-virus software on your computer. Moreover, back up important data and files on your computer regularly. 

 Download for Win Recovery Rate 99.7%
 Download for Mac Trustpilot Rating 4.7

Recover Encrypted Files Without Password FAQs

Want to know more about recovering encrypted files without passwords? You can check the following questions and answers to learn more:

How to restore encrypted Excel files without a password?

It is possible to decrypt Excel files and restore them without a password. You can decrypt Excel files by removing the password, using the VBA code, or using the Excel password removal tool. And you can recover lost Excel files from the Recycle bin and retrieve files by searching the file name or applying EaseUS Data Recovery Wizard.

Is it possible to recover encrypted files?

Yes, you can recover the encrypted files with EaseUS Data Recovery Wizard. It will not take you too much time to recover the files.

  1. 1. Launch EaseUS Data Recovery Wizard and scan for the lost encrypted files.
  2. 2. Preview the lost files.
  3. 3. Recover the lost encrypted files.

How to encrypt files on Windows operating system?

It is not difficult to encrypt files on Windows 11/10/8, you just need to follow the detailed steps below:

  1. 1. Find the file or folder you wish to encrypt.
  2. 2. Right-click the file and click "Properties." Then, click the "Advanced" button on the General screen.
  3. 3. Check the "Encrypt Contents to Secure Data" box under the Compress or Encrypt attributes section, then click the "OK" button.
  4. 4. Click the "OK" button. An encryption warning box will pop up.
  5. 5. Check the "Encrypt the File Only" box to encrypt the individual file, then click "OK" to finish.

How do I manually decrypt a file on Windows 10?

You can follow the steps below to decrypt a file on Windows 10:

  1. 1. Select "Programs or All Programs" under the start menu, click "Accessories", and then choose "Windows Explorer".
  2. 2. Right-click the file you want to decrypt, and click "Properties".
  3. 3. Click "Advanced".
  4. 4. Clear the Encrypt contents and then click "OK".

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Updated by Jaden

Jaden is one of the editors of EaseUS, who focuses on topics concerning PCs and Mac data recovery. Jaden is committed to enhancing professional IT knowledge and writing abilities. She is always keen on new and intelligent products.

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Approved by Mahesh Makvana

Mahesh is an experienced computer tech writer. He's been writing tech how-to guides for about 8 years now and has covered many topics. He loves to teach people how they can get the most out of their devices.

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