dotnetcore/NPOI
A .NET library for reading and writing Microsoft Office binary and OOXML file formats. observed · 2026-08-28
Health v2 · maintenance only
10/100
- Activity 0
- Release rhythm 8
- Longevity 100
Flags: archived
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 3561
- days_rel: n/a
- days_push: 2108
- n_releases_24m: 0
Adoption not part of the score
1950 stars · 406 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
NPOI is a .NET library for reading and writing Microsoft Office binary (BIFF) and OOXML file formats such as Excel and Word documents. It is a .NET Core port of the Apache POI project, migrated from Tony Qu's original NPOI.
Use cases
- read and write Excel xlsx files in C#
- generate Word documents programmatically in .NET
- parse legacy .xls binary spreadsheets
- export data grids to Excel without Office installed
- manipulate Office OOXML files on .NET Core
- create Excel reports from a web application
When to choose
- you need to read or write Excel/Word files in .NET without COM interop or Office installed
- you need support for both legacy binary (.xls) and OOXML (.xlsx/.docx) formats
- you want a free Apache-2.0 alternative to commercial spreadsheet libraries
When to avoid
- you need a fully managed, actively maintained alternative and prefer ClosedXML or Open XML SDK for xlsx only
- you need formats beyond Office files like PDF or ODF
- you require very heavy Excel features like full chart rendering
Facets
library · maturity maintenance
parser file-system serialization files developer-tools spreadsheets dotnet cross-platform excel word office-formats ooxml xlsx docx spreadsheet apache-poi-port
1 source
- readme: https://github.com/dotnetcore/NPOI · fetched 2026-08-28 · 113406910f12
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| dotnetcore/NPOI | main | 10 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem