# dotnet/Open-XML-SDK

Open XML SDK by Microsoft

Repository: https://github.com/dotnet/Open-XML-SDK
Canonical: https://ross.abutalabs.com/products/open-xml-sdk
Homepage: https://www.nuget.org/packages/DocumentFormat.OpenXml/ 
Language: C#
License: MIT
License Family: permissive
Topics: openxml-format, office, pptx, docx
Last push: 2026-08-18T19:25:33+00:00

## Health v2 (maintenance only)
Score: 86/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 63, longevity 100
- inputs: {"age_days": 4472, "days_push": 15, "days_rel": 168, "gap_med": 86.5, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4589, forks 605 (observed 2026-08-28T04:08:54.650850+00:00)

## What it is
Microsoft's Open XML SDK is a .NET library for programmatically working with Word, Excel, and PowerPoint documents via the ISO 29500 Open XML format. It provides strongly-typed classes and LINQ to XML access to OPC packages and Open XML markup for high-performance document generation and manipulation.

## Use cases
- generate word documents programmatically
- create excel spreadsheets without office installed
- modify pptx presentation files in .net
- search and replace text in docx files
- merge or split office documents
- update chart data embedded in word documents
- read office file metadata

## When to choose
- you need to create or edit Office files in .NET without Office installed
- you need high-performance bulk generation of docx/xlsx/pptx files
- you're comfortable working with the Open XML format at a low level

## When to avoid
- you want a high-level document API with simple abstractions
- you need to render or convert documents to PDF or images
- you work outside the .NET ecosystem

## Facets
- artifact type: library
- maturity: stable
- function: serialization, parser, developer-tools
- domain: files, developer-tools
- platform: dotnet, cross-platform
- tags: openxml, docx, xlsx, pptx, office-documents, microsoft-office, opc-packages, automation

## Member repositories
- dotnet/Open-XML-SDK (main) score 86

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:54.650850+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:19:51.135464+00:00, confidence not recorded.
  - readme: https://github.com/dotnet/Open-XML-SDK (fetched 2026-08-28T04:08:54.650850+00:00, sha e24089c931ff)
  - homepage: https://www.nuget.org/packages/DocumentFormat.OpenXml/  (fetched 2026-08-29T09:05:03.853615+00:00, sha 899de71ae99c)
  - site_page: https://www.nuget.org/policies/About (fetched 2026-08-29T09:05:03.864802+00:00, sha a113b8a074c9)
- Data as of 2026-08-30T08:39:29.467469+00:00.