A daily updated filename extension database!

DER file extension

The table below provides useful information about the .der file extension. It answers questions such as:

  • What is the .der file?
  • What program do I need to open a .der file?
  • How can the .der file be opened, edited or printed?
  • How can I convert .der files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Certificate File

The Distinguished Encoding Rules file contains a binary representation of a certificate, including its public key, but not its private key.
DER format description not yet available
Category: Other files
Application: OpenSSL
Mime-type: application/x-x509-ca-cert
Magic number: -
Magic string: -
Sample: -
DER aliases:
DER related links:
DER related extensions:
PEM Encoded Certificate File

Other types of files may also use the .der file extension.

🚫 The .der file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

cer, ddr, de, ded, dee, def, det, dfr, dr, dre, drr, dsr, dwr, edr, eer

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Broderbund PrintMaster Certificate
MSI Cerius 2 Format Data
Dr. Engrave Document
Visual Basic Designer File
Java Serialized Object
Noptel NOS Statistics Series Data
DReport Exported Report
Windows Error Report
Act! Email Message
Creator Circuit Description File

🔴 Can't open a .der file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .der file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .der file extension, write to us!

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