OfficeIMO — Open XML utilities for .NET

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OfficeIMO is a family of lightweight .NET libraries for working with Office and document-related formats without Office automation or COM.

Word: create and edit .docx documents with a friendly object model
Excel: read/write worksheets, tables, ranges, styles, and reports
CSV: schema-aware CSV model with typed mapping and streaming helpers
PowerPoint: generate .pptx slides programmatically
Visio: basic .vsdx generation helpers
Markdown: builder, typed reader/AST, HTML rendering, and host-oriented rendering helpers
Reader: read-only extraction facade for ingestion scenarios

Each package is shipped independently under the MIT license unless noted otherwise.

Project READMEs

OfficeIMO.Word
OfficeIMO.Excel
OfficeIMO.GoogleWorkspace
OfficeIMO.Excel.GoogleSheets
OfficeIMO.Word.GoogleDocs
OfficeIMO.CSV
OfficeIMO.PowerPoint
OfficeIMO.Visio
OfficeIMO.Markdown
OfficeIMO.Markdown.Html
OfficeIMO.MarkdownRenderer
OfficeIMO.MarkdownRenderer.Wpf
OfficeIMO.MarkdownRenderer.IntelligenceX
OfficeIMO.MarkdownRenderer.SamplePlugin
Converters
- OfficeIMO.Markdown.Html
- OfficeIMO.Word.Html
- OfficeIMO.Word.Markdown
- OfficeIMO.Word.Pdf
Reader
- OfficeIMO.Reader
Benchmarks
- OfficeIMO.Markdown.Benchmarks
Release prep
- Docs/officeimo.markdown.release-checklist.md

Website

Public site content and GitHub Pages deployment live under Website/
Maintainer notes for the website pipeline and API ingestion live in Docs/officeimo.website.md

Package Families

Word family

OfficeIMO.Word: main Word document object model
OfficeIMO.Word.Html: HTML conversion helpers
OfficeIMO.Word.Markdown: Markdown conversion helpers
OfficeIMO.Word.Pdf: PDF export helpers

Google Workspace family

OfficeIMO.GoogleWorkspace: shared credential, session, Drive location, retry, and translation-report abstractions
OfficeIMO.Word.GoogleDocs: Word to Google Docs planning, batch compilation, and export helpers
OfficeIMO.Excel.GoogleSheets: Excel to Google Sheets planning, batch compilation, and export helpers

Markdown family

OfficeIMO.Markdown: markdown builder, typed reader/AST, HTML renderer, front matter, TOC, callouts, and query helpers
OfficeIMO.Markdown.Html: HTML-to-Markdown AST bridge targeting the OfficeIMO.Markdown document model
OfficeIMO.MarkdownRenderer: WebView/browser-friendly rendering shell and incremental update helpers
OfficeIMO.MarkdownRenderer.Wpf: reusable WPF/WebView2 MarkdownView host layered on top of the generic renderer
OfficeIMO.MarkdownRenderer.IntelligenceX: first-party IntelligenceX plugin pack layered on top of the generic renderer
OfficeIMO.MarkdownRenderer.SamplePlugin: sample third-party-style plugin pack showing shared visual host rendering plus HTML round-trip hints
OfficeIMO.Markdown.Benchmarks: representative parse/render benchmark harness

Other packages

OfficeIMO.Excel: workbook, worksheet, table, style, and reporting helpers
OfficeIMO.CSV: typed CSV read/write and schema workflows
OfficeIMO.PowerPoint: programmatic slide generation
OfficeIMO.Visio: basic diagram generation
OfficeIMO.Reader: unified read-only extraction facade for ingestion workflows

Targets

Word, PowerPoint, Visio: netstandard2.0, net472, net8.0, net10.0
Excel, CSV: netstandard2.0, net472, net8.0, net10.0
Markdown, MarkdownRenderer: netstandard2.0, net472, net8.0, net10.0
MarkdownRenderer.Wpf: net472, net8.0-windows, net10.0-windows for the WPF/WebView2 surface, plus shared helper code on net8.0 and net10.0 for cross-platform validation/tests

AOT / Trimming

Reflection-heavy convenience APIs remain available for dynamic and PowerShell scenarios.
For trimming-sensitive workloads, prefer typed overloads and explicit selectors.
OfficeIMO.Markdown and OfficeIMO.MarkdownRenderer are designed to stay lightweight and predictable for embedded/document-host scenarios.

Dependencies at a glance

Arrows point from a package to what it depends on.

Word

flowchart TB
  WCore["OfficeIMO.Word"]
  subgraph Extensions
    WHtml["OfficeIMO.Word.Html"]
    WMd["OfficeIMO.Word.Markdown"]
    WPdf["OfficeIMO.Word.Pdf"]
  end

  Angle["AngleSharp"]
  AngleCss["AngleSharp.Css"]
  Md["OfficeIMO.Markdown"]
  MdHtml["OfficeIMO.Markdown.Html"]
  Quest["QuestPDF"]
  Skia["SkiaSharp"]

  WHtml --> WCore
  WMd --> WCore
  WPdf --> WCore

  WMd --> WHtml
  WHtml --> Angle
  WHtml --> AngleCss
  MdHtml --> Md
  WMd --> Md
  WPdf --> Quest
  WPdf --> Skia

Converters ship in-repo and continue to evolve before broader release packaging decisions.

Markdown

flowchart TB
  Md["OfficeIMO.Markdown"]
  MdHtml["OfficeIMO.Markdown.Html"]
  MdRenderer["OfficeIMO.MarkdownRenderer"]
  MdRendererWpf["OfficeIMO.MarkdownRenderer.Wpf"]
  MdRendererIx["OfficeIMO.MarkdownRenderer.IntelligenceX"]
  MdRendererSample["OfficeIMO.MarkdownRenderer.SamplePlugin"]
  MdBench["OfficeIMO.Markdown.Benchmarks"]
  WordMd["OfficeIMO.Word.Markdown"]
  Json["System.Text.Json"]
  WebView2["Microsoft.Web.WebView2"]

  MdHtml --> Md
  MdRenderer --> Md
  MdRenderer --> MdHtml
  MdRendererWpf --> MdRenderer
  MdRendererWpf --> WebView2
  MdRendererIx --> MdRenderer
  MdRendererSample --> MdRenderer
  MdRenderer --> Json
  MdBench --> Md
  WordMd --> Md

Excel

flowchart TD
  Xl["OfficeIMO.Excel"]
  OXml["DocumentFormat.OpenXml"]
  ImgSharp["SixLabors.ImageSharp"]
  Fonts["SixLabors.Fonts"]

  Xl --> OXml
  Xl --> ImgSharp
  Xl --> Fonts

PowerPoint

flowchart TD
  Ppt["OfficeIMO.PowerPoint"]
  OXml["DocumentFormat.OpenXml"]

  Ppt --> OXml

Visio

flowchart TD
  Vsdx["OfficeIMO.Visio"]
  ImgSharp["SixLabors.ImageSharp"]
  Pkg["System.IO.Packaging"]

  Vsdx --> ImgSharp
  Vsdx --> Pkg

When do I need what?

Creating or editing Word documents: add OfficeIMO.Word
Word to HTML: add OfficeIMO.Word + OfficeIMO.Word.Html
Word to Markdown or Markdown to Word: add OfficeIMO.Word + OfficeIMO.Word.Markdown
Word to PDF: add OfficeIMO.Word + OfficeIMO.Word.Pdf
Building or parsing Markdown directly: add OfficeIMO.Markdown
Hosting Markdown in WebView2 or a browser shell: add OfficeIMO.MarkdownRenderer
Hosting Markdown in a WPF desktop app with WebView2: add OfficeIMO.MarkdownRenderer.Wpf
Hosting IntelligenceX transcript/chat surfaces on top of the generic renderer: add OfficeIMO.MarkdownRenderer.IntelligenceX
Benchmarking markdown parse/render behavior before release: use OfficeIMO.Markdown.Benchmarks
Excel read/write and reporting: add OfficeIMO.Excel
Shared Google Workspace session/auth primitives: add OfficeIMO.GoogleWorkspace
Word to Google Docs planning or export: add OfficeIMO.Word + OfficeIMO.Word.GoogleDocs
Excel to Google Sheets planning or export: add OfficeIMO.Excel + OfficeIMO.Excel.GoogleSheets
CSV schemas and typed CSV workflows: add OfficeIMO.CSV
PowerPoint slides: add OfficeIMO.PowerPoint
Visio diagrams: add OfficeIMO.Visio

Markdown Release Prep

For the current markdown package line:

package docs live in OfficeIMO.Markdown/README.md, OfficeIMO.MarkdownRenderer/README.md, and OfficeIMO.MarkdownRenderer.Wpf/README.md
benchmark harness lives in OfficeIMO.Markdown.Benchmarks
release steps live in Docs/officeimo.markdown.release-checklist.md

Dependency versions (high level)

DocumentFormat.OpenXml: 3.3.x (conservative version ranges)
SixLabors.ImageSharp / SixLabors.Fonts: Excel and image-centric packages
AngleSharp / AngleSharp.Css: HTML conversion layers
QuestPDF / SkiaSharp: PDF conversion layers
System.Text.Json: markdown renderer host helpers

See each project .csproj for exact package ranges.

Licenses

OfficeIMO.Word, OfficeIMO.Excel, OfficeIMO.CSV, OfficeIMO.PowerPoint, OfficeIMO.Markdown, OfficeIMO.MarkdownRenderer, OfficeIMO.MarkdownRenderer.Wpf, OfficeIMO.Markdown.Html, OfficeIMO.Word.Html, OfficeIMO.Word.Markdown, OfficeIMO.Word.Pdf: MIT
OfficeIMO.Visio: license still being finalized

Third-party dependency licenses are gover

OfficeIMO

Install / Use

README