The method varies by platform, but the principle is the same: register the key once at application startup.
A long string appeared on the screen. This was the artifact. But having the key isn't enough; it has to be registered before the first Syncfusion control is called.
For a .NET Core / .NET 5+ application, the best practice is to modify Program.cs (or MainPage.xaml.cs for older frameworks).
Alex copied the key and pasted it into the startup code:
using Syncfusion.Licensing;
public static void Main(string[] args)
// The Solid Solution: Register the key right here
SyncfusionLicenseProvider.RegisterLicense("YOUR_LONG_LICENSE_KEY_HERE");
CreateHostBuilder(args).Build().Run();
If you cannot install the License Manager, you can generate your key via the Syncfusion website. This is the most common method, but it is also where most errors occur. syncfusion generate license key best
To generate manually:
Pro Tip (The "Best" practice for manual generation):
Do not copy the key directly into your code. Instead, copy it into a secure location like Azure Key Vault or environment variables first. Hardcoding your license key in appsettings.json is a security anti-pattern.
Alex logged in and faced a dashboard of options. The mistake most developers make here is clicking "Downloads" and looking inside the ZIP files for a text file. The license key is never in the download package.
Alex clicked the "Generate License Key" button (usually found under the 'License & Keys' section in the account dashboard). The method varies by platform, but the principle
A modal window appeared, asking for the platform.
Alex clicked "Generate".
The best practice is to place it in the application entry point:
- name: Generate Syncfusion License
run: |
$key = syncfusion license generate --username $ secrets.SYNC_USER --password $ secrets.SYNC_PASS --platform "blazor" --version "23.1.36"
echo "SYNCFUSION_LICENSE_KEY=$key" >> $env:GITHUB_ENV
For organizations asking "How do we generate Syncfusion license keys best at scale?", follow this workflow: If you cannot install the License Manager, you
Generating a Syncfusion license key is a simple process, but doing it best means more than just copying a string. The best approach involves secure storage, early registration, platform-specific handling, and automated updates. By following the practices outlined in this guide, you’ll eliminate license-related runtime errors and keep your applications compliant with Syncfusion’s licensing terms.
If you’re still encountering issues, Syncfusion’s support team (free for licensed users) or their extensive documentation can help resolve platform-specific quirks.
Last updated: 2025 – Applies to Syncfusion Essential Studio 2025 Volume 1 and later.