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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.
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
Opening a certificate usually prompts you to install it to your system. Be careful when installing unknown certificates.
Certificates are not meant to be converted to anything else.
Software apps that import der files:
Microsoft Windows
Software applications that handle other tasks involving der files:
Microsoft Windows
Apple macOS / Mac OS X