.crt DER/PEM/Netscape-encoded X.509 certificate
Other formats
| MIME type | application/x-x509-ca-cert |
|---|---|
| Description | DER/PEM/Netscape-encoded X.509 certificate |
| Category | Other formats |
| Other extensions | .cert, .der, .pem |
Frequently asked questions
What is a .crt file?
A .crt file is a “DER/PEM/Netscape-encoded X.509 certificate” (MIME type application/x-x509-ca-cert).
How do I open a .crt file?
With the program that created the file. On Linux, xdg-mime query default with the MIME type shows the default application, and xdg-open opens the file with it.
How can you tell a genuine .crt file?
No fixed signature at the start of the file is registered for this format; it is recognised mainly by its extension. On Linux and macOS, file --mime-type example.crt shows the guessed type.
Which MIME type belongs to .crt?
The MIME type is application/x-x509-ca-cert. In the Apache web server: AddType application/x-x509-ca-cert .crt; in nginx: types { application/x-x509-ca-cert crt; }.