.CRT File

File extension crt is frequently used for Internet security certificates. Server, web site transactions, logins, webmail and connections are usually secured with a SSL Certificate.

One of the most used certificate formats is the X.509v3. The standard known as ITU-T X.509 (formerly CCITT X.509) or ISO/IEC 9594-8, which was first published in 1988 as part of the X.500 Directory recommendations, defines a standard certificate format. The certificate format in the 1988 standard is called the version 1 (v1) format.

MIME types used:
application/x-x509-ca-cert
application/pkix-cert
application/keychain_access
application/x-x509-user-cert

Files with crt suffix can be usually found as Internet security certificates in a well known and supported standard.

How to open:

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

How to convert:

Certificates are not meant ot be converted to anythin else.