Before troubleshooting code, ensure you have a valid, active key. Log in to your . Navigate to the License & Downloads section. Select Generate License Key .
Register the key in the Main method of your Program.cs or App.xaml.cs file, before InitializeComponent or Run . Common Fixes for "Syncfusion License Not Working"
Upgrading to a new major version of Syncfusion (e.g., from v30 to v31) always requires a new license key. The old key will be considered invalid. Always generate a fresh key for the new major version and update it in your code.
If you are seeing a recurring trial watermark or receiving a "License is invalid" exception in your application, your Syncfusion license registration is failing. Syncfusion requires explicit license key registration in your code for all platforms. Here is how to fix the trial license key issue permanently. Why the Trial Error Happens syncfusion trial license key fix
This is the #1 reason the "fix" fails. If you updated your NuGet packages but kept an old license key, the warning will persist. Always refresh your key in the Syncfusion License & Downloads portal after an upgrade.
Find your platform below to see exactly where to paste your key: For ASP.NET Core / Blazor Server & WebAssembly
Note the exact version number of the Syncfusion packages you are using. Log into your . Go to Downloads & Keys > Get License Key . Before troubleshooting code, ensure you have a valid,
: If you recently updated your key or packages, persistent watermarks often come from cached files.
import enableProdMode from '@angular/core'; import platformBrowserDynamic from '@angular/platform-browser-dynamic'; import registerLicense from '@syncfusion/ej2-base'; // Register the Syncfusion license key registerLicense('YOUR_ACTUAL_LICENSE_KEY_HERE'); import AppModule from './app/app.module'; // ... bootstrap code Use code with caution.
In .NET applications, register the license in your Program.cs file immediately after creating the builder. Select Generate License Key
What of Syncfusion packages are you currently running? What error message or visual watermark are you seeing?
: Place the registration code at the absolute entry point of your application (e.g., Program.cs , Main() , or Global.asax.cs ). Licensing FAQ – Get the license key - Help.Syncfusion.com
This is the universal that works for every project type.
Some developers have reported success by manually modifying the license key. This method involves updating the registry or the application's configuration file.
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