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tonyqus / npoi


a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.


NPOI (moved from

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This project is the .NET version of POI Java project. With NPOI, you can read/write Office 2003/2007 files very easily.

Support and Service

Neuzilla is the studio behind NPOI.
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Advantage of NPOI

a. It's totally free to use
b. Cover most features of Excel (cell style, data format, formula and so on)
c. Professional support service (even 24*7) from NPOI team (not free)
d. Support xls, xlsx, docx.
e. Designed to be interface-oriented (take a look at NPOI.SS namespace)
f. Support not only export but also import
g. .Net 2.0 based even for xlsx and docx (though we also support .NET 4.0)
h. Real successful cases all over the world
i. huge amout of basic examples

How to join

If you have passion to contribute code, please contact

Neuzilla on SNS

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QQ Group: 20144214

System Requirement

VS2010 with .NET 4.0 runtime
VS2005 or VS2008 with .NET 2.0 Runtime (SP1)
vs2003 with .NET 1.1 (Obselete, last version is 1.2.1. No further support)