What is a NB file?
A .NB file is a computational document. The primary format is the Mathematica Notebook, created by Wolfram Mathematica. Wolfram Research developed this format to store interactive text, executable code, mathematical formulas, and graphical outputs in a structured plain text document. In rare cases, the .NB extension also belongs to academic text documents created by Nota Bene. Because the .NB extension has multiple possible meanings, viewer.online/nb is the best way to identify the actual format of your file.
How to open NB files?
The standard software to open, edit, and run a Mathematica Notebook is Wolfram Mathematica. If you only need to read the document, you can use the free Wolfram Player. Because .NB files use a plain text structure, you can also open them in basic text editors like Notepad++ or Visual Studio Code. However, the raw internal code is very complex and difficult to read without the native software.
Inspect and View NB Files Online
viewer.online/nb can analyze .NB files to identify the exact format and creator software. You can inspect the file structure, extract readable text, and check whether an online preview is available. This helps you read the internal data without downloading specialized viewers.
File Conversion
If you need to share a Mathematica Notebook with someone who does not use Wolfram Research products, you should convert the file. The most sensible target formats are .PDF for visual sharing or .TXT for raw text extraction. You can explore these conversions at convert.guru/nb-converter.
Summary
viewer.online/nb is highly useful for identifying, inspecting, and understanding .NB files without installing software or dealing with compatibility problems. It provides a fast and secure way to extract information from complex computational notebooks.