A file with .crt extension is a security certificate file. It is used by secure websites for establishing secure connections from web server to a browser. Secure websites make it possible to secure data transfers, logins, payment card transactions, and provide protected browsing. If you open a secure website, you see a “lock” icon in the address bar. If you click on it, you can view the details of the installed certificate.
International companies distribute these SSL certificates. The CRT extension can also be used for other types of data. But the use for digital certificates is the most common.
These files contain text and words, not binary data. The file size is 20 KB to 56 KB. Sometimes used for server, client, user, authority or star. If you want to find out what your CRT file contains, drag and drop it onto this page.
What is CRT file? Security certificates used by secure websites saved on the server to enable encrypted connection are saved in files with .CRT extensions. Security Certificates allow secure data transfer, logging, payments, or safe web browsing. CRT files adhere to PEM and X.509 certificate standards.
You need to update the application to open .CRT files. Only the latest version of the software supports the current .CRT file format.
The CRT File Extension has one primary file type, Security Certificate format. It can be opened with four software programs.
Web Browsers
OpenSSL