Network Notepad Professional license
File type: Various data file
Files with the .nnl file extension belong to Network Notepad Professional, a network diagramming tool for Microsoft Windows.
An .nnl file contains licensing information for the application.
File type category:
Various data file
Date updated: October 16, 2026
Network Notepad Professional is a Microsoft Windows application for creating interactive network diagrams. Its .nnl file is a supporting license file rather than a diagram file.
The file stores licensing information used by Network Notepad Professional. It is intended to be used by the application and may not contain data that is meaningful when viewed as a document.
The .nnl file format is specific to Network Notepad Professional on Windows.
Open an .nnl file with Network Notepad Professional on Microsoft Windows. The application normally uses the file as part of its licensing process, so it may not be intended for manual opening.
Do not edit the file manually. If Network Notepad Professional does not recognize it, use the software's licensing functions or reinstall the application according to its licensing instructions.
An .nnl file is a license file and cannot be meaningfully converted to another file format. Its licensing information is intended for use by Network Notepad Professional.
Network diagram content should be exported from Network Notepad Professional using the application's own export options; converting the license file will not convert a diagram.
Software applications that handle other tasks involving nnl files:
Microsoft Windows
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