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Basic information about CER file

When there is a problem with opening files with the file extension CER（*.CER or *.cer）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the CER file yourself.

There are 5 file types using the CER file extension in our database. In the further part of this page, you will find detail information about all the CER file with their brief description and a list of programs that support CER file sorted by operating systems. The table below provides useful information about the CER file extension. It answers questions such as:
  • What is the CER file?
  • How to open a CER file?
  • What programs do I need to open a CER file?
  • What programs help to create and edit a CER file?
  • How to convert CER files to another file format?
  • How to convert another files to CER file format?


1.Detail information about CER file extension: Internet Security Certificate

File type Internet Security Certificate Category Web Files
Developer N/A File format Binary
Description CER file is a Internet Security Certificate. A CER file is a security file provided by a third party Certificate Authority, such as VeriSign or Thwate, that verifies the authenticity of a website. It is installed on a web server to establish the validity of a certain website hosted on the server.
Software programs that will open, edit or convert CER files

Windows		 Microsoft Internet Explorer
Mozilla Firefox
Other Web browser
Adobe Reader
Adobe Acrobat DC

macOS		 Apple Safari
Mozilla Firefox
Adobe Reader
Adobe Acrobat DC
Apple Keychain Access

Linux		 Mozilla Firefox
Adobe Reader


2.Detail information about CER file extension: Lahey Fortran Compilation Error Message

File type Lahey Fortran Compilation Error Message Category Page Layout Files
Developer N/A File format N/A
Description CER file is a Lahey Fortran Compilation Error Message.
Software programs that will open, edit or convert CER files

Windows		 Lahey Fortran


3.Detail information about CER file extension: Cerius2 Data File

File type Cerius2 Data File Category Misc Files
Developer N/A File format N/A
Description CER file is a Cerius2 Data File.
Software programs that will open, edit or convert CER files

Windows		 Cerius2
Discovery Studio


4.Detail information about CER file extension: Creatacard Certificate Project File

File type Creatacard Certificate Project File Category Misc Files
Developer N/A File format N/A
Description CER file is a Creatacard Certificate Project File.
Software programs that will open, edit or convert CER files

Windows		 CreataCard


5.Detail information about CER file extension: Sierra Print Artist Certificate File

File type Sierra Print Artist Certificate File Category Page Layout Files
Developer N/A File format N/A
Description CER file is a Sierra Print Artist Certificate File.
Software programs that will open, edit or convert CER files



Can't open a CER file?

When you click a file to open it, operating system examines the filename extension. If operating system recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When operating system does not recognize a filename extension, you receive the following message:

”Can't open this file: example.CER”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the CER extension without any issue.


Where I can download the application that support CER file?

If you do not know where you can download the application from our list, click on the link (which is the name of the program), you will find more information there on the location where to download the required application. Most often they are the websites of software manufacturers.


How to change file associations?

  • Right-click a file with the extension whose association you want to change, and then click "Open With".
  • In the "Open With" dialog box, click the program whith which you want the file to open, or click "Browse" to locate the program that you want.
  • Select the ”Always use the selected program to open this kind of file” check box.


Can I change the extension of CER files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a CER file?

The reasons for the lack of the ability to open a CER file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a CER file. If there is still something wrong, you might want to check:

  • Whether the CER file is damaged.
  • Whether the CER file is incorrectly linked in the registry entries.
  • Whether the CER file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the CER file format is incompletely.
  • Whether the CER file is infected.
  • Whether the drivers of the equipment used for opening a CER file are up to date.
  • Whether your computer has enough hardware resources to open a CER file.

If the CER file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.