Applying Software License Keys

Using IronPdf License Keys

If you decide to purchase a license for IronPDF, you will instantly receive a license key as soon as your payment has cleared. This License will be displayed on the checkout screen and also be sent by email.

Setting your IronPdf license key using code

Add this code to the startup of your application, your before IronPDF is used.

IronPdf.License.LicenseKey = "IRONPDF-MYLICENSE-KEY-1EF01";
IronPdf.License.LicenseKey = "IRONPDF-MYLICENSE-KEY-1EF01"
VB   C#

Setting your IronPdf license key using Web.Config or App.Config

To apply a key globally to your application using Web.Config or App.Config, add the following key to your config file in appSettings.

<configuration>
   ....
   <appSettings>
      <add key="IronPdf.LicenseKey" value="IRONPDF-MYLICENSE-KEY-1EF01"/>
   </appSettings>
   ....
</configuration>

To test if your key has been installed correctly

bool result = IronPdf.License.IsValidLicense("IRONPDF-MYLICENSE-KEY-1EF01");
Dim result As Boolean = IronPdf.License.IsValidLicense("IRONPDF-MYLICENSE-KEY-1EF01")
VB   C#

Note: After adding a license always remember to clear all temp and cache folders on your development and servers. Redeploy a CLEAN version of your application to reduce the chance of DLL caching.