.CER File Extension

Internet Security Certificate File

Data File
CER files are security files that have been provided by a third party Certificate Authority, such as VeriSign or Thwate. CER files are used to verify the authenticity of a website. The CER file is installed on a Web server to establish the validity of a certain website hosted on the server. CER files can be viewed by clicking the lock icon near the edge of a browser window when accessing a secure site (secure sites use SSL encryption as seen by the "https://" prefix in the URL), to view the certificate in Safari, click the lock icon located near the top-right corner of the browser window.

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Comments (2)
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Theo de Wit
2009-09-08 06:28:33
How do I edit a .cer file? I want to change a date in a csp certificate for test reasons.
2009-10-01 02:47:51
usually they're X509 digital certificates encoded in DER format