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REQ CSR
File conversion

Convert REQ to CSR

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Is it possible to convert REQ to CSR?
Yes - REQ converts to CSR.

.req and .csr are the SAME thing (a PKCS#10 certificate request) - just different extension conventions (Windows certreq uses .req, OpenSSL/Linux uses .csr). Simply rename, or re-output with 'openssl req -in file.req -out file.csr'. No real conversion needed.

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert REQ to CSR

Converting a .REQ file to .CSR lets you open the content in software that prefers the .CSR format, though some details may change compared with the original. We are still putting together the list of programs that handle .REQ files.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats

.REQ Certificate Signing Request (CSR) - .req

A .req file is a Certificate Signing Request (CSR) - a small encoded text block you send to a Certificate Authority to get an SSL/TLS or other digital certificate. Open it in any text…

Open .REQ details →
.CSR Certificate Signing Request (PKCS#10)

A CSR file is a Certificate Signing Request -- a block of Base64 text generated on your server and submitted to a Certificate Authority to apply for an SSL/TLS certificate. Inspect it with…

Open .CSR details →