OfficeOxide 0.1.0

OfficeOxide for .NET — The Fastest Office Document Library for C#

Idiomatic C# bindings for office_oxide — a fast Rust library for parsing, converting, and editing Microsoft Office documents (DOCX, XLSX, PPTX, DOC, XLS, PPT).

• IDisposable / using pattern for native handles.
• LibraryImport source generator — NativeAOT-compatible, trim-safe.
• net8.0 and net10.0 target frameworks.
• Async helpers (Document.OpenAsync) that offload to the thread pool.

Part of the office_oxide toolkit. Same Rust core, same pass rate as the Rust, Python, Go, JavaScript (native), and WASM bindings.

Quick Start

dotnet add package OfficeOxide

using OfficeOxide;

using var doc = Document.Open("report.docx");
Console.WriteLine(doc.Format);        // "docx"
Console.WriteLine(doc.PlainText());
Console.WriteLine(doc.ToMarkdown());

Why OfficeOxide?

• Fast — 0.8ms mean DOCX, 5.0ms mean XLSX, 0.7ms mean PPTX; up to 100× faster than python-docx / openpyxl / python-pptx
• Reliable — 100% pass rate on valid Office files (6,062-file corpus); zero failures on legitimate documents
• Complete — 6 formats: DOCX, XLSX, PPTX + legacy DOC, XLS, PPT
• Permissive — MIT / Apache-2.0, no AGPL or GPL restrictions
• NativeAOT-safe — LibraryImport source generator, trim-compatible

Performance

Benchmarked on 6,062 files from 11 independent public test suites. Single-thread, release build, warm disk cache.

Installation

dotnet add package OfficeOxide

The NuGet package bundles pre-built native libraries for:

Editing

using var ed = EditableDocument.Open("template.docx");
ed.ReplaceText("{{NAME}}", "Alice");
ed.Save("out.docx");

Spreadsheet cells

using var ed = EditableDocument.Open("report.xlsx");
ed.SetCell(0, "A1", "Revenue");
ed.SetCell(0, "B1", 12345.67);
ed.SetCell(0, "C1", true);
ed.Save("report.edited.xlsx");

One-shot helpers

string text = OfficeOxide.ExtractText("report.docx");
string md   = OfficeOxide.ToMarkdown("report.docx");
string html = OfficeOxide.ToHtml("report.docx");

Other languages

office_oxide ships the same Rust core through six bindings:

• Rust — cargo add office_oxide — see docs.rs/office_oxide
• Python — pip install office-oxide — see python/README.md
• Go — go get github.com/yfedoseev/office_oxide/go — see go/README.md
• JavaScript (native) — npm install office-oxide — see js/README.md
• WASM — npm install office-oxide-wasm — see wasm-pkg/README.md

Why I built this

I needed a library that could read all six Office formats at once — not six separate packages — and I needed it without pulling in a JVM, a Python runtime, or a GPL-licensed dependency. The same Rust binary powers Python via PyO3, Node.js via koffi, Go via cgo, C# via P/Invoke, and the browser via WASM — one fix lands everywhere.

If something's broken or missing, open an issue.

— Yury

License

Dual-licensed under MIT or Apache-2.0 at your option.

C# / .NET + Rust core | MIT / Apache-2.0 | 100% pass rate on valid Office files (6,062-file corpus) | Up to 100× faster than alternatives | 6 formats