By default, if no license key is inserted into the code, GemBox.Document runs in .
If you still see this exception despite calling SetLicense , verify that:
Websites offering cracked DLLs or illegal key generators frequently bundle trojans, ransomware, and credential stealers that can compromise your local development machine or development network.
| Need | Action | |------|--------| | Free development | Use the (limited to 20 paragraphs per document). | | Testing / open source | Apply for a free license (sometimes available for OSS or evaluation). | | Production use | Buy a developer license (one-time fee, perpetual, includes updates for 1 year). | | Volume licensing | Contact GemBox directly for site licenses. | Gembox.document License Key
Install-Package GemBox.Document
This guide covers everything you need to know about GemBox.Document license keys, validation mechanics, and deployment best practices. Understanding GemBox.Document License Modes
GemBox offers flexible licensing options based on the size of your development team. As of 2026, the pricing structure is: $890 (for 1 developer). Small Team License: $4,450 (for up to 10 developers). Large Team License: $13,350 (for up to 50 developers). By default, if no license key is inserted
Users with unauthorized license keys receive no technical support from GemBox Software. When encountering bugs, compatibility issues, or performance problems, developers are left without recourse.
Standard keys usually include one year of free updates and technical support. To use versions of GemBox.Document released after your subscription expires, you must renew your license key. 3. How to Apply Your GemBox.Document License Key
A GemBox.Document license key is a unique alphanumeric string provided by GemBox upon purchasing a license. This key unlocks the full capabilities of the component, removing the built-in limitations of the Free mode. | | Testing / open source | Apply
Understanding GemBox.Document Licensing: Options, Key Usage, and Best Practices
Create or manipulate documents of any size without paragraph or page count restrictions.
using GemBox.Document; class Program static void Main() // 1. Professional Mode: Replace with your actual key ComponentInfo.SetLicense("YOUR-SERIAL-KEY"); // 2. Free Mode: Use this constant for testing // ComponentInfo.SetLicense("FREE-LIMITED-KEY"); // Use the library normally var document = new DocumentModel(); // ... Use code with caution. Copied to clipboard Key Working Modes