File Extension

CRT File Format

Certificate file

CRT is a file extension for a digital certificate file used with a web browser. CRT files are used to verify a secure website's authenticity, distributed by certificate authority (CA) companies such as GlobalSign, VeriSign and Thawte. CRT files allow a web browser to connect securely using the Secure Sockets Layer protocol. CRT files can be viewed by clicking the lock icon within your web browser.

MIME type: application/x-x509-ca-cert, application/pkix-cert, application/keychain_access, application/x-x509-user-cert

 

Learn more about .CRT files:

SearchSecurity.com has collected news and learning resources about digital certificates.

Visit the VeriSign web page.

Learn about Security Certificates at ITKnowledgeExchange.com.

This was last updated in September 2010
Editorial Director Margaret Rouse
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