DER File

What are DER files and how to open them

Are you having problems opening a DER file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a DER file?

A .DER file is a DER Encoded X509 Certificate file.

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open DER files

Important: Different programs may use files with the DER file extension for different purposes, so unless you are sure which format your DER file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 2 different DER openers which you will find listed below.

Last updated: December 3, 2022

Various apps that use files with this extension

These apps are known to open certain types of DER files. Remember, different programs may use DER files for different purposes, so you may need to try out a few of them to be able to open your specific file.

DigitalSign ProfessionalDigitalSign ProfessionalUser submitted
DigitalSign ReaderDigitalSign ReaderUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about DER file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.