· Nov 14, 2016 1m read

openssl for Windows


Where can I find the openssl command line tool for Windows?


The openssl command line utility comes with Unix, but not with Windows. It is used for working with security certificates.

The main site is

There are no binaries on this site but in the Community section there is a link for binaries which leads to:

This contains a link to "An informal list of third party engines":

At the time of writing this had two entries for OpenSSL for Windows. I chose the first one:

On this page there are several options. For 64 bit Windows I chose this one: "Win64 OpenSSL v1.1.0c Light".

I installed and ran this on Windows 10 successfully.

For example:

1. Convert certificate from binary to PEM format:

[install_dir]\bin\openssl x509 -in cert.cer -inform der -outform pem -out cert.pem

2. Display binary certificate as text:

[install_dir]\bin\openssl x509 -in cert.cer -inform der - text

You can find the Unix man pages here:

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