DER file: How to open? The best software for opening der files

DER

DER encoded internet security certificate

File type: Email attachment blocked file, Internet related file

A der file extension is related to the DER encoded internet security certificate file format. A der file stores certificate.

What is der file?

File type category:
Email attachment blocked file
Internet related file

Date updated: June 27, 2025

The der file extension is used for DER encoded internet security certificates. Secure your server, web site transactions, logins, webmail and connections with an SSL Certificate.

Choose GlobalSign SSL Certificates for the highest levels of strong security, confidence and trust in your web site, corporate assets and online brand.

MIME types:
application/x-x509-ca-cert
application/pkix-cert

How to open der file?

Opening a certificate usually prompts you to install it to your system. Be careful when installing unknown certificates.

How to convert der file?

Certificates are not meant to be converted to anything else.

Suggested software to open der file:

Associated software actions with the der file