Even after generating and applying the key, errors can appear. Here are the most common issues:
| Error Message | Cause | Solution |
|----------------|--------|----------|
| Trial Expired | No key applied, or key is for a different platform | Ensure you called RegisterLicense before any Syncfusion control is instantiated. |
| Invalid License Key | The key was copied incorrectly (extra spaces, wrong key) | Re-generate the key from your dashboard. Copy exactly. Do not modify it. |
| License key is not registered for this platform | The key was generated for WinForms but used in Blazor | Generate a new key from your dashboard (keys are platform-agnostic now, but older versions were not). Update Syncfusion NuGet packages. |
| The license has expired | Your subscription ended, or you are using a trial key | Renew your subscription, or generate a new Community License. |
| Unable to find Syncfusion.Licensing assembly | Missing NuGet reference | Install Syncfusion.Licensing NuGet package: Install-Package Syncfusion.Licensing |
When generating a key, the type of license dictates how long the key remains valid and what features are unlocked. syncfusion generate license key
| License Type | Validity | Key Generation Behavior | |--------------|----------|--------------------------| | Trial (30 days) | 30 days | Generates a key valid for 30 days. After expiry, controls stop working. | | Community (Free) | 1 year (renewable) | Full access. You must re-generate a new key each year after re-certifying eligibility. | | Commercial Paid | 1 year (subscription) | Key works for one major version (e.g., 2024 Vol 1). To upgrade to new features, you must generate a new key for the new version. | | Perpetual (Legacy) | Unlimited | Rare today. Key never expires but only covers the version purchased. |
Critical Note: If your subscription renews, your existing key remains valid for the version you originally downloaded. To use a newer version of Syncfusion, you must re-generate a new license key from your account. Even after generating and applying the key, errors
Before you can generate a license key, ensure you have the following:
| Requirement | Description | |-------------|-------------| | A Syncfusion Account | Register at syncfusion.com | | An Active License | Purchase a license or register for the free Community License (if eligible) | | Registered Serial Number | After purchase, your serial number must be registered to your account | | Internet Access | The key generation is done via the web portal | Before you can generate a license key, ensure
💡 Community License: If you are an individual developer, a small business (less than $1 million USD annual revenue), or a student, you may qualify for a free Community License. You still need to generate a key via the portal.
Call it early in App.xaml.cs or MainWindow constructor:
Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("YOUR_LICENSE_KEY");
Syncfusion requires a valid license key for all production use of its components (ASP.NET Core, JavaScript, Blazor, WinForms, WPF, Xamarin, MAUI, etc.).
The key is a cryptographically signed string that:
Even if you have a commercial license or a free Community License, you must generate and apply a license key.