.NET 10 • Open XML • Scriptable CLI

Clippit Fresh PowerTools for OpenXml

Create, transform, compare, split, and validate Office documents with a modern .NET library and a native CLI built for automation. Clippit wraps the Open XML SDK with high-level APIs for Word, Excel, and PowerPoint workflows.

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Friendly Clippit agent reviewing Open XML documents

Clippit — Fresh PowerTools for OpenXml

Clippit is a .NET library for programmatically creating, modifying, and converting Word (DOCX), Excel (XLSX), and PowerPoint (PPTX) documents. Built on top of the Open XML SDK, it provides high-level APIs that handle the complexity of the Open XML format so you can focus on your content. It also includes a scriptable CLI for PowerPoint split, build, and validation workflows.

Getting Started

Library from NuGet 
dotnet add package Clippit
CLI from NuGet 
dotnet tool install -g Clippit.Cli
CLI from npm 
npm install -g clippit

Split a PowerPoint presentation into individual slides:

using Clippit.PowerPoint;

var presentation = new PmlDocument("conference-deck.pptx");
var slides = PresentationBuilder.PublishSlides(presentation);

foreach (var slide in slides)
{
    slide.SaveAs(Path.Combine("output", slide.FileName));
}

Features

Clippit covers a broad range of document processing scenarios across all three Office formats. Every feature listed below has a dedicated tutorial with API signatures and code samples.

Word

Feature Description
DocumentAssembler Populate DOCX templates with data from XML, including images and inline HTML
DocumentBuilder Merge, split, and reorganize DOCX files with an extensible ISource model and TableCellSource
WmlComparer Compare two DOCX files and produce a diff with revision tracking markup
WmlToHtmlConverter High-fidelity conversion from DOCX to HTML/CSS
HtmlToWmlConverter Convert HTML/CSS back into a properly structured DOCX
RevisionProcessor Accept or reject tracked revisions programmatically
MarkupSimplifier Clean up and normalize DOCX markup for easier processing

Excel

Feature Description
SpreadsheetWriter Generate multi-sheet XLSX files with formatted tables, streaming support for millions of rows, and a concise Cell Builder API
SmlDataRetriever Extract data and formatting from existing spreadsheets as structured XML

PowerPoint

Feature Description
PresentationBuilder Merge and split PPTX files, with a Fluent API for ergonomic slide composition and optimized slide publishing

CLI

Feature Description
Clippit CLI Scriptable PPTX split/build/verify commands with human-readable text output, stable JSON output, stdin/stdout support, and JSON schemas for automation

Common

Feature Description
OpenXmlRegex Search and replace content across DOCX/PPTX using regular expressions
MetricsGetter Retrieve document metrics — style hierarchy, languages, fonts, and more

Compatibility

  • Target: net10.0
  • Dependency: DocumentFormat.OpenXml (Open XML SDK)
  • Platforms: Windows and Linux (continuously tested on both)
  • Side-by-side: Can coexist with the original Open-Xml-PowerTools assembly

Heritage

Clippit originated as a fork of Open-Xml-PowerTools and has since evolved into an independently maintained library with new features, performance improvements, and modern .NET support. See the Changelog for the full release history.

Questions and Contributing

Have a question or idea? Start a GitHub Discussion.

Found a bug or want to request a feature? Open an Issue.

Copyright (c) Microsoft Corporation 2012-2017
Portions Copyright (c) Eric White Inc 2018-2019
Portions Copyright (c) Sergey Tihon 2019-2026
Licensed under the MIT License.
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