1. IronPDF
  2. Troubleshooting
  3. Apply a license key in IronPDF

Apply a license key in IronPDF

The license key is a long string that ends with an expiry date. Please ensure this is copied correctly, with no spaces.

    IRONPDF-MYLICENSE-KEY-1EF01-EXPIRES.01.JAN.2050

The most robust method of applying a license key is directly in your code, before the library is called.

    IronPdf.License.LicenseKey = "IRONPDF-MYLICENSE-KEY-EXPIRES.01.JAN.2050";

For more options, including web.config and appsettings.json, please see this FAQ page for more information: https://ironpdf.com/how-to/license-keys/