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Download Zend Guard/Optimizer
Zend Guard is the industry leading solution for PHP IP protection.
Zend Guard provides independent software vendors and IT managers with the ability to safely distribute and manage the distribution of their PHP applications while protecting their source code.
Zend Optimizer is a free application that runs the files encoded using Zend Guard and enhances the overall performance of your PHP applications.
Looking to get better application performance? Download the Zend
Server free trial that includes Zend Optimizer+ and much more!
Linux 
Windows
Mac OS X| Product | Version | Format/Size | Notes |
|---|---|---|---|
| Zend Guard | 5.5.0 | (TAR.GZ) 68.27 MB | Release Notes |
| Zend Optimizer (Runtime for PHP 5.2 and earlier) | 3.3.9 (32 bit) | (TAR.GZ) 2.98 MB | User Guide |
| Zend Optimizer (Runtime for PHP 5.2 and earlier) | 3.3.9 (64 bit) | (TAR.GZ) 2.71 MB | User Guide |
| Zend Guard Loader (Runtime for PHP 5.3) | 5.5.0 (32 bit) | (TAR.GZ) 0.38 MB | Release Notes |
| Zend Guard Loader (Runtime for PHP 5.3) | 5.5.0 (64 bit) | (TAR.GZ) 0.41 MB | Release Notes |