.DER File Recovery

Have files been deleted due to a user’s error or software error? Have you formatted a disk by accident and need to know how to recover the files? Read our .DER file recovery guide for Windows, MacOS, Android and IOS in 2024.

DER File Recovery

What is a .DER file?

Digital certificate file created in the Distinguished Encoding Rules (DER) format; contains a binary representation of the certificate; commonly used for storing X.509 certificates in public cryptography.

What Are Common Causes of ".DER" Files Lost or Failure?

There are several common causes of ".DER" file loss or failure:

  1. Accidental deletion: One of the most common causes is accidentally deleting the ".DER" file. This can happen when you are cleaning up your computer or storage device and mistakenly delete the file.
  2. File system corruption: If the file system on your computer or storage device becomes corrupted, it can lead to the loss of ".DER" files. This can happen due to software or hardware issues, such as sudden power loss or improper system shutdown.
  3. Virus or malware infection: Malicious software can infect your computer and delete or corrupt ".DER" files. Viruses or malware can enter your system through email attachments, malicious websites, or infected software downloads.
  4. Hardware failure: If there is a hardware failure in your computer or storage device, it can result in the loss of ".DER" files. This can occur due to issues with the hard drive, memory card, or other storage media.
  5. Software conflicts or errors: Sometimes, conflicts between different software programs or errors within a specific program can lead to the loss or failure of ".DER" files. This can occur due to software bugs, compatibility issues, or improper installation/uninstallation of software.
  6. Human error: Human error, such as accidentally formatting the wrong drive or overwriting the ".DER" file, can also cause its loss or failure.
  7. Natural disasters: Natural disasters like floods, fires, or earthquakes can damage your computer or storage devices, leading to the loss of ".DER" files.

It is important to regularly back up your ".DER" files to prevent loss and to use reliable antivirus software to protect against malware and viruses.

How to recover lost ".DER" files?

Sometimes while working with a computer, laptop or other stationary or mobile devices, you may encounter various bugs, freezes, hardware or software failures, even in spite of regular updates and junk cleaning. As a result, an important ".DER" file may be deleted.

Go to view
🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

By no means should you think that the only way to recover a ".DER" file is always to create it once more.

Use programs for recovering ".DER" files if a file was lost after accidental or deliberate deleting, formatting the memory card or the internal storage, cleaning the storage device, after a virus attack or a system failure.

Programs to recover ".DER" files

Looking for a way to get files back? In cases when files were deleted and they cannot be restored by using standard operating system tools, use Hetman Partition Recovery.

Partition Recovery™ 4.9
The tool recovers data from any devices, regardless of the cause of data loss.

Follow the directions below:

  1. Download Hetman Partition Recovery, install and start the program.

  2. The program will automatically scan the computer and display all hard disks and removable drives connected to it, as well as physical and local disks.

    File Recovery Software
  3. Double-click on the disk from which you need to recover ".DER" files, and select analysis type.

    Hetman Partition Recovery - Analysis Type
  4. When the scanning is over, you will be shown the files for recovery.

    Hetman Partition Recovery - Files that Can be Restored
  5. To find a file you need, use the program’s interface to open the folder it was deleted from, or go to the folder "Content-Aware Analysis" and select the required file type.

    Hetman Partition Recovery - Deep Scan
  6. Select the files you have been looking for and click "Recovery".

    File Recovery Software - Files List for Recovery
  7. Choose one of the methods for saving the files and recover them.

    Saving recovered files in Hetman Partition Recovery

How to open file with ".DER" extension?

Looking for how to open a stereo dER Certificate File image file file?

Programs that open ".DER" files

Microsoft Internet Explorer Microsoft Internet Explorer
Mozilla Firefox Mozilla Firefox
Apple Safari Apple Safari
Mozilla Firefox Mozilla Firefox
Apple Keychain Access Apple Keychain Access
Mozilla Firefox Mozilla Firefox

Additional Information

  • File type: DER Certificate File

  • File extension: .DER

  • Developer: N/A

  • Category: Web Files

  • Format: Binary


We will be happy to answer your questions!

Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 12:48 #
    Leave a comment if you have any questions about Recovering lost .DER files after deleting, cleaning or formatting!
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.


Questions and answers

  • What are the common causes of .DER file corruption or damage, and how can I repair them?

    .DER files are commonly used for storing digital certificates. Corruption or damage to these files can occur due to various reasons, including:

    1. File system errors: Issues with the file system, such as disk errors or improper shutdowns, can lead to file corruption.
    2. Malware or viruses: If your system gets infected with malware or viruses, it can corrupt or damage files, including .DER files.
    3. Software or hardware issues: Problems with software or hardware components, such as faulty drivers or conflicts, can cause file corruption.
    4. Improper handling: Accidental deletion, improper shutdowns, or unexpected power outages while working with .DER files can result in corruption.

    To repair corrupted or damaged .DER files, you can try the following solutions:

    1. Restore from backup: If you have a backup of the .DER file, you can restore it to its original state.
    2. Use file repair tools: Several software tools are available that can repair corrupted files. These tools attempt to fix the file by reconstructing its damaged parts.
    3. Scan for malware: Run a thorough scan of your system using reliable antivirus software to detect and remove any malware that might be causing the corruption.
    4. Check hardware: Ensure that your hardware components, such as the hard drive or memory, are functioning properly. Run diagnostic tests to identify and fix any issues.
    5. Seek professional help: If the above methods fail, you may need to consult a professional data recovery service. They have specialized tools and expertise to recover and repair corrupted files.

    Remember to always keep backups of important files to minimize the impact of file corruption or damage.

  • Are there any specific software tools or methods available for repairing .DER files?

    .DER files are commonly associated with digital certificates and are typically in binary format. They contain encoded information about the certificate, such as the public key and other relevant details.

    Repairing .DER files typically involves addressing any corruption or issues that may have occurred during transmission, storage, or processing. However, since .DER files are binary files, there are no specific software tools or methods available for repairing them in the same way you would repair a document or image file.

    If a .DER file is corrupted or not functioning as expected, the best approach is to obtain a valid and uncorrupted version of the file from a trusted source. If the .DER file is related to a digital certificate, you may need to contact the issuer or the entity responsible for providing the certificate to obtain a valid copy.

    It's worth noting that repairing .DER files may not be a common or necessary task, as they are typically generated and managed by certificate authorities or software applications. If you're experiencing issues with a .DER file, it may be more appropriate to troubleshoot the underlying cause or seek assistance from the relevant software or service provider.

  • Can you provide step-by-step instructions on how to repair a corrupted .DER file using a specific tool or technique?

    Certainly! Here's a step-by-step guide to repairing a corrupted .DER file using the OpenSSL tool:

    Step 1: Install OpenSSL

    • Download and install OpenSSL on your computer. You can find the appropriate version for your operating system from the OpenSSL website (https://www.openssl.org).

    Step 2: Open a Command Prompt

    • Open a command prompt or terminal window on your computer.

    Step 3: Navigate to OpenSSL Directory

    • Change the directory to where OpenSSL is installed. For example, if OpenSSL is installed in the default location on Windows, you can navigate to the directory using the following command:


    cd C:OpenSSLbin


    Step 4: Repair the Corrupted .DER File

    • Run the following command to repair the corrupted .DER file:


    openssl x509 -inform der -in .der -out .der


    Replace `.der` with the actual path and filename of the corrupted .DER file, and `.der` with the desired path and filename for the repaired file.

    Step 5: Verify the Repaired File

    • To ensure the file was repaired successfully, you can verify the repaired .DER file using the following command:


    openssl x509 -in .der -text -noout


    Replace `.der` with the actual path and filename of the repaired .DER file.

    That's it! Following these steps should help you repair a corrupted .DER file using the OpenSSL tool.

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