Download Details

Version: 4.1.0 (latest)
File size: 311.23 MB
License: Free
Security scan: VirusTotal: 49 of 49 engines say OK (0 flagged)
SHA-256 checksum: 42e47b1292787040eb56b54fc62b16d3c5e3eb85fdcb88f213a8d02f2148bc52
Developer: Shining Light Productions
Supported OS: Windows 11, Windows 10, Windows 7, Windows 8.1
Installers: 64-bit (x64), 32-bit (x86), ARM (Arm64), Offline
Downloads: 17254
Rating: 4.6 out of 5 · 72 reviews
File name(s): Win64OpenSSL-4_1_0.msi, Win32OpenSSL-4_1_0.msi, Win64ARMOpenSSL-4_1_0.msi

Reviewed by Ahmed Madbouli
Tested on Windows 11 and 10 · November 11, 2026 · How we review

Screenshots

Get this if you need to create certificates, inspect HTTPS connections or convert key formats from a Windows terminal.

It suits developers, sysadmins and anyone setting up a local HTTPS test server. If you only browse the web, you have no reason to install it.

The build is free and comes in 64-bit, 32-bit and ARM64 installers.

Standout: one command line tool covers private keys, certificate requests and TLS checks.

What is OpenSSL?

OpenSSL is an open-source cryptography library with a command line tool on top. Web servers, VPN software and many apps rely on its code for TLS and certificates.

On Windows you install a ready-made build and run the openssl command yourself.

Keys, certificate requests and self-signed certs from one prompt

The command line tool generates private keys, builds certificate signing requests and creates self-signed certificates. That covers most local HTTPS setups and test servers.

It also reads certificates, so you can print their details and check the dates and the issuer.

Tip: openssl x509 -in cert.pem -text -noout prints a certificate in readable form.

Checking what a live HTTPS site really sends

The s_client command opens a TLS connection to a host and shows the certificate chain it presents. It is a quick way to find an expired certificate or a missing intermediate.

Tip: openssl s_client -connect example.com:443 is the usual starting point.

Converting between PEM, PFX and other formats

Windows often wants a PFX file, while Linux servers and many tools expect PEM. OpenSSL converts between them with the pkcs12 command.

The syntax is easy to mistype, so keep a note of the commands you use most.

Hashing and encrypting files by hand

The dgst command calculates file hashes, which helps when you want to verify a download. The enc command encrypts a file with a passphrase.

For everyday file encryption, a dedicated desktop tool is easier to use.

Why the Windows installer comes from Shining Light Productions, and is it safe?

The OpenSSL project publishes source code, so Windows binaries come from third parties. This page offers the build from Shining Light Productions, a long-running source of Windows installers for OpenSSL.

The file was checked with VirusTotal and came back clean. Download it from the button on this page rather than from random mirrors.

A terminal-only tool with a learning curve

There is no window and no menu, only commands and options. Mistyped flags give short error messages that are not always clear.

Tip: start with openssl help and a single task, such as creating a self-signed certificate, before trying anything bigger.

Who can skip OpenSSL

If you never touch certificates, keys or server setups, you can leave it uninstalled. Browsers and most apps ship their own TLS code.

People who want clicks instead of commands should look at a graphical certificate manager.

How to Download & Install

Press the download button at the top of this page to get the OpenSSL setup program (an EXE). The wizard has only a handful of screens.

Installation steps

Step 1: Run the installer you just downloaded and approve the Windows prompt if it appears.

Step 2: Tick the box that accepts the license terms on the first screen, then move on with Next.

OpenSSL Install Accept the Agreement and Click Next

Step 3: Pick the destination folder for the OpenSSL files. Leave the suggested path as it is unless you want the toolkit on a different drive, then click Next.

OpenSSL Install Select Destination Location

Step 4: On the Additional Tasks screen, pick where the OpenSSL DLL files should be copied. The OpenSSL binaries (/bin) directory is the safer choice, because it keeps the files out of the Windows system folder.

OpenSSL Install Select Additional Tasks

Step 5: Click Install and wait until the progress bar finishes.

OpenSSL Install Click Install

Step 6: Click Finish. The last screen offers a donation page to the developer, so untick that box if you do not want it to open.

Step 7: Open Command Prompt or PowerShell and type openssl version to confirm the install worked.

Installer types

Main installer: the 64-bit build, which fits nearly every current Windows PC.
32-bit installer: only for older 32-bit systems or programs that need 32-bit libraries.
ARM64 installer: for Windows laptops with Arm processors.

System requirements

Windows 11, Windows 10, Windows 8.1 or Windows 7
Processor: x64, x86 or Arm64, matching the installer you pick

License and activation

You pay nothing for this build, and it asks for no serial number or sign-in.

How to update

Grab the newest installer from the button on this page and run it on top of the existing setup. Restart any terminal window afterwards so it picks up the new files.

Fixing common install problems

“openssl” is not recognized: add the bin folder inside the install directory to your PATH variable, then open a new terminal window.
Missing DLL errors in other programs: reinstall and choose the /bin directory option for the DLL files, or copy the DLLs next to the program that complains.
A warning about openssl.cnf: set the OPENSSL_CONF environment variable to the configuration file in the install folder.

Pros & Cons

What we liked

Free to use
Standard tool for TLS and certificates
Works offline
64-bit, 32-bit and ARM64 installers

What we didn't like

No graphical interface
Steep learning curve
Windows build comes from a third party

Best OpenSSL Alternatives

Unreal Engine
A professional tool to make high-quality games and 3D experiences.
Node.js
JavaScript runtime for building fast servers, APIs and command line tools.
Git (Git Bash)
Free version control with a Bash terminal for tracking code history.

Conclusion

4.6out of 5 · 72 user ratings

OpenSSL is plain and text-only, but it does certificates, keys and TLS checks better than most tools on Windows. Expect to spend some time learning the commands.

Alternatives worth a look:

LibreSSL: free fork from the OpenBSD team with a smaller codebase, though it is less common on Windows.
GnuTLS: free TLS library, mostly used on Linux.
PowerShell certificate cmdlets: built into Windows, enough for simple self-signed certificates.

Install OpenSSL if you manage servers, build software or test HTTPS locally. Skip it if a browser is all you use.

FAQ

Is the Windows version an official release from the OpenSSL project?

No, the project itself publishes source code. The Windows installer here is built by Shining Light Productions.

How can I tell the installation worked?

Open Command Prompt or PowerShell and run openssl version. If it prints a version line, the install is fine.

What command creates a self-signed certificate?

Run openssl req -x509 -newkey rsa:2048 -nodes -keyout key.pem -out cert.pem -days 365. It asks a few questions and writes the key and certificate to the current folder.

Why do I get a warning about openssl.cnf?

OpenSSL cannot find its configuration file. Set the OPENSSL_CONF environment variable to the config file inside the install folder.

Which installer fits a Windows laptop with an Arm chip?

Use the ARM64 installer. Standard x64 and x86 PCs should use the main or 32-bit installer.

Can older Windows PCs run this build?

Yes, the supported systems for this build include Windows 7 and 8.1 alongside Windows 10 and 11.

Is there a graphical version of OpenSSL?

OpenSSL itself has no graphical interface. It runs from the terminal, and third-party front ends exist if you prefer clicking.

Found a problem with this download? Report an outdated version, broken link, suspicious installer or incorrect information.

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