System Requirements
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 |
BC Math Fileinfo |
| 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.