A csr file extension is related to certificate signing request file format developed by OpenSSL.
There are 2 other file types using
the CSR file extension!
.csr - Fast SMS Set SMS Relay configuration
.csr - Cardinal spline representational data
Detailed description
Software that open csr file
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What is csr file? How to open csr files?
The csr file extension is associated with the Certificate signing request service used to sign certificates developed by OpenSSL Project.
The csr file contains certificate signing request encrypted data and digital signs.
The default software associated to open csr file:
OpenSSL 
OpenSSL is toolkit used for implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols.
Help how to open:
Use compatible tools to work with *.csr files.
How to convert:
As far as we know, this .csr file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.
Related links:
OpenSSL Project website
List of software applications associated to the .csr file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open csr file, edit csr file, convert csr file, view csr file, play csr file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting csr files.
Software that open csr file - Certificate signing request
Programs supporting the exension csr on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open csr file action.
Programs that can create csr file - Certificate signing request
Programs supporting the exension csr on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for create csr file action.
Unspecified and all other actions for computer programs working with csr file - Certificate signing request
Click on the software link(s) for more information. Suggested software applications use csr file type for internal purposes and/or also by different way than common edit or open csr file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
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