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OpenSSL for Windows — download, setup, use

20 focused guides covering the full OpenSSL workflow on Windows 10 and 11 — from downloading the installer to generating certificates, testing TLS connections and fixing runtime errors.

This is an unofficial Windows-focused guide site. It links to the prebuilt installer from Shining Light Productions and provides setup guides. The official OpenSSL project is at openssl.org.
All guides

Everything you need for OpenSSL on Windows

From downloading the installer to generating certificates and fixing runtime errors — 20 focused guides covering the full Windows workflow.

Install & setup
Common tasks
Troubleshoot
Reference
Quick start

Get OpenSSL running on Windows in 5 steps

  • 1

    Download the Win64 installer

    Get the prebuilt installer from the Win64 Prebuilt page. Choose Light (~5 MB) for command-line use or Full (~100 MB) for development with headers.

  • 2

    Verify the SHA256 hash

    Before running the installer, check its integrity: certutil -hashfile Win64OpenSSL_Light-4_0_0.exe SHA256 and compare to the value on slprowex.com. Full guide: Verify Hashes.

  • 3

    Run the installer

    Double-click the installer and follow the wizard. Note the install path — typically C:\Program Files\OpenSSL-Win64.

  • 4

    Add the bin folder to PATH

    Add C:\Program Files\OpenSSL-Win64in to your Windows PATH so openssl is available in any terminal. See Add to PATH guide.

  • 5

    Verify the installation

    cmd.exe — new window
    C:\> openssl version
    OpenSSL 4.0.0 6 Jun 2025

    If you see a DLL error instead, visit Fix libcrypto.dll.

FAQ

Common questions

Is this the official OpenSSL site?
No. This is an unofficial Windows guide site. It links to the prebuilt installer from Shining Light Productions (slprowex.com). The official project is at openssl.org.
How do I verify the installer is safe?
Run certutil -hashfile installer.exe SHA256 and compare to slprowex.com. Full guide: Verify Hashes.
openssl is not recognized after installing
The bin folder is not on PATH, or you have not opened a new terminal window. See Add to PATH and openssl not recognized fix.
I get a libcrypto.dll error
Most commonly caused by a 32/64-bit mismatch or missing VC++ Redistributable. See Fix libcrypto.dll.
Light vs Full installer — which should I use?
Use Light for command-line work. Use Full if you are developing software against OpenSSL and need header files. See Win64 Prebuilt.

Ready to install OpenSSL on Windows?

Start with the Win64 prebuilt installer — verify the hash first.

Win64 Prebuilt installer →