CompatibilityLevel

compatibilityLevel

Method Name	Argument Name	Argument Type
compatibilityLevel	compatibilityLevel	Mostafaznv\PdfOptimizer\Enums\CompatibilityLevel

The PDF version number: 1.2, 1.3, 1.4, 1.5, 1.6, or 1.7

Applications other than Distiller do not support saving files as PDF 1.2.