Some developers inspect the diagram in Chrome DevTools, find the watermark <div> , and try to hide it with:
The only authorized method to remove the watermark is to: Purchase a license from Northwoods Software. Apply the valid license key provided to you in your code.
Attempting to modify the library code to bypass the watermark is a violation of the GoJS Software License Agreement. The library is heavily obfuscated to prevent tampering. gojs remove watermark
For developers working on prototypes or learning projects, the evaluation watermark is an acceptable compromise that allows full access to the library's capabilities without upfront cost. For production applications, the only reliable and legitimate solution is to purchase a commercial license.
Old versions also have watermarks, and they lack modern features (e.g., pen support, rich text editing). More importantly, using an outdated version exposes you to security vulnerabilities (though rare for canvas libraries). Some developers inspect the diagram in Chrome DevTools,
If your goal is simply to render static charts, flowcharts, or sequence diagrams from text/markdown configuration rather than creating a highly interactive, drag-and-drop editor, Mermaid is an lightweight, free solution. Conclusion
"Minifying my code will hide the fact that I removed the watermark." Fact: Northwoods can still run detection scripts. The presence of a GoJS diagram without a valid license key is detectable via JavaScript memory inspection. The library is heavily obfuscated to prevent tampering
Because GoJS renders directly onto an HTML5 element, the watermark is drawn programmatically as part of the canvas rendering loop. It is not a separate HTML or image layer that can be easily hidden using a quick CSS rule like display: none; or standard DOM manipulation.