Browse Tools Top 100
REQ CER
Not possible

Convert REQ to CER

Can you convert REQ to CER?
QUICK ANSWER
Is it possible to convert REQ to CER?
No - not a direct conversion.

A CSR cannot be 'converted' into a certificate (.cer/.crt) - only a Certificate Authority can issue the certificate by signing your request. Submit the .req to a CA (or your internal Windows CA) and it returns the .cer. There is no offline file conversion that produces a valid cert.

No direct path
Also to CER: PFX · P12 · CAT

On this page

Tested on macOS, Windows & Linux
Last verified Oct 2026

More free converters

HEIC, PNG, WEBP, MP3 and more - every tool here is free.

Open the toolbox

Converting REQ to CER

A .REQ file and a .CER file hold different kinds of data, so there is no direct way to turn one into the other.

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 →
.CER Security certificate (X.509 .cer)

A CER file is an X.509 digital certificate that binds an identity (a website, server, or publisher) to a public key, signed by a Certificate Authority. On Windows, double-click it to view…

Open .CER details →