All about CSR Files

The CSR file type is primarily associated with OpenSSL.

CSR	File extension: CSR
	File type:	text file

What is a CSR file?

CSR files mostly belong to OpenSSL. Certificate Signing Request (CSR) files are encoded text files used to request a digital certificate. They carry encrypted data such as a public key and identifying details.

Purpose: Contains the information a certificate authority uses to issue an SSL certificate.

Process: Generated with cryptographic utilities like OpenSSL, these files encode data in Base64.

Content Structure: Typically begins with -----BEGIN CERTIFICATE REQUEST----- and ends with a corresponding footer.

Alternate Use: In rare cases, certain devices (e.g., some Casio models) may use the CSR extension for different data types.

FilExt.com note: This file does not contain the certificate itself; it is a formal request that, once approved by a certificate authority, leads to the creation of a certificate.

How do you open CSR files?

You need a suitable software like OpenSSL to open a CSR file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CSR file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CSR file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CSR Text Viewer

Choose your .csr file to view

or drag and drop it here

Online File Viewer

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How to extract texts from CSR files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

If you want to extract texts from CSR file or capture a screenshot, you can use our free Online CSR File Viewer:

To do this, click the button "Choose your .csr file to view" on this page.
After your file is opened in browser,
click "Save as..." in the menu.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert CSR files:

OpenSSL
See the previous paragraphs to learn more about the main application. CSR files are often referred to as OpenSSL encodeds because this type of file is primarily created or used by this software.
Fast SMS Set (SMS Relay Configuration) by Comat AG
The Comat SMS relay is a remote control and messaging system. Digital inputs and relay outputs with alternating contacts are monitored by means of a SMS (Short Message System) via a mobile telephone network. This file format is classified as Text.

CSR file extension format:

To find out what program is needed to open CSR files, you need to determine the file format. The file format can be deduced from the file extension and the signature. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our evaluation of the CSR files is as follows:

As a file extension, CSR isn't very common and is mainly used by one program with a specific format. But the following two file formats are common:

75% of all CSR files are Certificate Signing Request files, which are using the popular certificate file format. A digital certificate is a unique, digitally signed document which authoritatively identifies the identity of an individual or organization. Using public key cryptography, its authenticity can be verified to ensure that the software or website you are using is legitimate. The contents of these files can even be read by a human. The files are often between 980 bytes and 1 KB in size. It is a modern file type. Certain words are almost always found in the files, such as ----BEGIN CERTIFICATE REQUEST----. The file name server.csr is characteristic of these files. Such files are related to certificate, cert, telia, certyfikat, egamings, request, relayr and bank.
8% of all CSR files start with the bytes PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0i crucial for this file format. These files are plain text, which means they can be viewed with any text editor such as Windows Editor, Nano for Linux, and TextEdit for macOS. Most of these files are 8.8 KB to 8.9 KB in size. The following keywords are characteristic: bWwgdmVyc, lvbj, wIiBlbmNvZGluZz, QtMS, RURCBQTElTVCAxLjAvL, VOIiAiaHR, cDovL, eUxpc, hcHBsZS, iVVRGLTgiPz, wLmR and wZXJ. These files are attributed to signing and push.

All the rest of the CSR files (17%) have different formats. You can get all the details of your CSR file by dragging it onto this page or by clicking the button "Choose your .csr file to view" above.

Technical Data for CSR File Extension

File classification:

Encoded

Related files:

crt, cer, pem, key, der, crs, tbd, ca, jks, req, scr, p10, cse, keystore, zip, csl, txt

Mime type:

application/pkcs10

a csr text file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CSR files

Associate the CSR file extension with the correct application.
Update your software that should actually open text files. Because only the current version supports the latest CSR file format. Search, therefore, e.g. on the manufacturer website after an available OpenSSL update.
To make sure that your CSR file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CSR file online - secure, fast, and no downloads needed.