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>> DER file

DER file format description

Many people share .der files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .der file can be edited, converted or printed with. On this page, we try to provide assistance for handling .der files.

1 filename extension(s) found in our database.

.der - Certificate File

The Distinguished Encoding Rules file contains a binary representation of a certificate, including its public key, but not its private key.

.der file format description:
DER format description not yet available
Other files
- / -
Certificate File related links:
Certificate File related extensions:
OpenSSL Certificate Authority Data
Certificate File
Certificate Signing Request
Key Database File
PKCS #12 Data File
PEM Encoded Certificate File

Naturally, other applications may also use the .der file extension. Even harmful programs can create .der files. Be especially cautious with .der files coming from an unknown source!

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 can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

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:

wer, cer, ser, edr, dsr, dre, dfr, def, ded, xer, ddr, ver, eer, dwr, drr

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Broderbund PrintMaster Certificate
Embird Color Palette Data
OMA DRM Rights Object XML
C++ Definition File
DDRemote Saved Parameters
GROMACS Portable Energy Data

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If you have useful information about the .der file format, then write to us!