System Requirements

From WHMCS Documentation

Most current web servers* that use PHP and MySQL® can run WHMCS.

The following table shows the minimum and recommended system requirements for running WHMCS 8.0 and later.

Looking for the requirements for the earlier WHMCS 7.5 - 7.10 versions? Click here.

Requirement Minimum Recommended
PHP Version 7.2 WHMCS 8.0 through 8.5 — Latest 7.4 Release
WHMCS 8.6 and later — Latest 7.4 or 8.1 Release
PHP Memory Limit 64MB 128MB**
PHP Database Extension PDO PDO
PHP Extensions Curl with SSL***

GD2 Image Library
JSON Support
Reflection
XML

BC Math

Fileinfo
GMP
Iconv
Intl
MBString
OpenSSL***
SOAP

MySQL Version 5.2.0 Latest 8.0
ionCube Loader® 10.4.5 or later for PHP 7.2 through 7.4

12.0.1 or later for PHP 8.1

The latest ionCube Loader version for your PHP version

View all supported PHP versions for each version of WHMCS in the PHP Version Support Matrix.

While these are the minimum requirements, we strongly recommend using the latest available, stable releases of all software and extensions. Recommendations are correct as at September 2022.

For details on the recommended system environment configurations (OS, web server, database engine, PHP, and ionCube Loader), see the System Environment Guide.

* We validate WHMCS to run in Linux based environments running the Apache web server. Other environments like Windows-based configurations may experience compatibility issues with which Technical Support cannot assist.

** Memory requirements vary depending upon the size and volume of activity in an installation. Your exact requirements may differ.

*** As part of PCI compliance, a SSL library capable of TLS 1.2 may be required. If using OpenSSL, version 1.0.1c or newer is recommended.