The File Extensions Database

.CSR File Extension

  • Category: Web Files
  • Format: Text

What is an .CSR file?

.CSR is Certificate Signing Request File

A CSR file is a file created as a signing request for a digital certificate. It contains an encrypted block of text that identifies the applicant of the certificate and includes encrypted data for country, state, organization, domain, email address, and public key. The file is used by a Certificate Authority to establish proof of identity for Web sites.

CSR files are generated using a public and private key. The public key is included in the CSR file, and the private key is used to digitally sign the CSR file.

Programs that open Certificate Signing Request File
Microsoft IIS

How to solve problems with CSR files

  • Associate the CSR file extension with the correct application. On :
    Windows: Right click on any CSR file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CSR files". Mac: Right click (or Ctrl-click) the CSR file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CSR is Certificate Signing Request File. Because only the current version supports the latest CSR file format. Search, therefore, e.g. on the N/A manufacturer website after an available .CSR is Certificate Signing Request File update.
  • To make sure that your CSR file is not corrupted or virus-infected, get the file again and scan it with antivirus software.