Having problems opening a cer file?

Find out what programs can help open, view, play or convert your cer files.

Opening cer files
Internet Security Certificate

Did your computer fail to open a cer file? We explain what cer files are and recommend software that we know can open or convert your cer files.

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What is cer file?

Security file provided by a third party Certificate Authority, such as VeriSign or Thwate, that verifies the authenticity of a website; 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). Secure certificate information can be viewed in Internet Explorer and Firefox by double-clicking the lock icon located near the bottom-right corner of the browser window. To view the certificate in Safari, click the lock icon located near the top-right corner of the browser window.

Software that will open, convert or fix cer files

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