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Upcoming Update Announcement: Starting with the next release, GroupDocs.Redaction will support .NET Framework 4.6.2 instead of 4.5. This update aims to enhance security and performance. Please update your development environment accordingly.

Download C# Library to Redact Documents via .NET API

GroupDocs.Redaction for .NET is an API that helps you erase sensitive and classified data from various file formats, such as, Microsoft Word, Excel, PowerPoint and PDF. The API’s single format-independent interface supports redaction of various types, e.g., text redaction, metadata redaction, annotation redaction, and tabular document redaction. The API also allows saving the output document in its original format as well as in a sanitized PDF document with raster images of original pages.

Release Notes Download

Get Started

Open NuGet package manager, search for GroupDocs.Redaction and install. You may also use the following command from the Package Manager Console.

Install

To install please execute Install-Package GroupDocs.Redaction from Package Manager Console in Visual Studio to fetch & reference GroupDocs.Redaction assembly in your project.

PM>

     Install-Package GroupDocs.Redaction

Update

If you already have GroupDocs.Redaction for .Net and want to upgrade it, please execute Update-Package GroupDocs.Redaction to get the latest version.

PM>

     Update-Package GroupDocs.Redaction

.NET API for Redacting Sensitive Data

GroupDocs.Redaction for .NET is a powerful API designed to redact classified or sensitive data from a variety of document types within your .NET applications. It supports multiple redaction types including text, metadata, annotations, and image redactions. The API also integrates with OCR engines for redacting text within images and provides the ability to remove pages and embedded images, ensuring the comprehensive redaction of confidential information. GroupDocs.Redaction is highly versatile, supporting a wide range of document formats, making it an essential tool for any organization dealing with sensitive information.

Text Redactions

Exact Phrase Redaction
Search and redact specific phrases or text strings with case-sensitivity options.

Regex Redaction
Redact text based on regular expressions for flexible text matching.

Right-to-Left Support
Redaction of right-to-left text such as Arabic and Hebrew.

Metadata Redactions

Erase Metadata
Remove all metadata from a document, such as author, date created, and comments.

Metadata Search Redaction
Remove sensitive information from metadata fields using regular expressions.

Annotation Redactions

Delete Annotations
Remove annotations, comments, and other markup from documents.

Redact Annotation Text
Redact sensitive data in annotations while keeping the annotations intact.

Spreadsheet Redactions

Cell and Column Redaction
Redact specific cells or entire columns within Excel spreadsheets.

Filter by Worksheet
Apply redactions to specific worksheets in Excel files.

Image Redactions

Image Area Redaction
Cover specific areas of images, such as headers or footers, with a colored box.

OCR-Based Redaction
Use Optical Character Recognition (OCR) to recognize and redact text embedded in images.

EXIF Data Removal
Remove metadata (e.g., EXIF data) from images, acting as an “EXIF eraser.”

Page Redactions

Remove Pages
Remove specific pages from documents such as PDFs, slideshows, or spreadsheets.

Page Area Filters
Apply redactions to specific areas on a page using coordinates.

Embedded Image Redactions

Embedded Image Redaction
Redact embedded images in documents, including PDF, Microsoft Office, and OpenOffice files.

Rasterization

Convert to Raster Images
Redact sensitive data and save documents as raster images, making all data unsearchable.

Document Saving Options
Save redacted documents in either original format for further editing or in raster format for increased security.

Support for OCR Engines

Third-Party OCR Integration
Integrate third-party OCR engines (e.g., Aspose.OCR or Microsoft Azure Computer Vision API) to recognize and redact text from images or image-based PDFs.

File and Document Information

Document Info Retrieval
Retrieve metadata and page counts for any document format.

Supported Document Formats

The following table indicates the file formats supported by GroupDocs.Redaction for .NET.

Format	Description	Document body	Metadata	Annotations (comments)	Embedded images	OCR	Remove Page	Page Filters
PDF	Saves the document as PDF (Adobe Portable Document) format	✔️	✔️	✔️	✔️	✔️	✔️	✔️
DOC	Microsoft Word 97 - 2007 Document.	✔️	✔️	✔️	✔️	✔️	✔️
DOT	Microsoft Word 97 - 2007 Template.	✔️	✔️	✔️	✔️	✔️	✔️
DOCX	Office Open XML WordprocessingML Document (macro-free)	✔️	✔️	✔️	✔️	✔️	✔️
DOCM	Office Open XML WordprocessingML Macro-Enabled Document	✔️	✔️	✔️	✔️	✔️	✔️
DOTX	Office Open XML WordprocessingML Template (macro-free)	✔️	✔️	✔️	✔️	✔️	✔️
DOTM	Office Open XML WordprocessingML Macro-Enabled Template	✔️	✔️	✔️	✔️	✔️	✔️
RTF	RTF format.	✔️	✔️	✔️	✔️	✔️
XLSX	OOXML 2007-2010	✔️	✔️	✔️		✔️
XLSM	OOXML Macro Enabled Workbook	✔️	✔️	✔️		✔️
XLTX	OOXML Workbook Template	✔️	✔️	✔️		✔️
XLTM	OOXML Macro Enabled Workbook Template	✔️	✔️	✔️		✔️
XLS	Excel Workbook 97-2003	✔️	✔️	✔️		✔️
XLT	Excel Workbook Template 97-2003	✔️	✔️	✔️		✔️
CSV	CSV (Comma Separated Value) file.	✔️	✔️	✔️
PPTX	OOXML Microsoft PowerPoint Presentations format	✔️	✔️	✔️	✔️	✔️	✔️	✔️
PPT	PowerPoint Presentation 97-2003	✔️	✔️	✔️	✔️	✔️	✔️	✔️
PPSX	PowerPoint Open XML	✔️	✔️	✔️	✔️	✔️	✔️	✔️
POT	PowerPoint template files	✔️	✔️	✔️	✔️	✔️	✔️	✔️
PPS	Microsoft PowerPoint 97-2003 Slide Show	✔️	✔️	✔️	✔️	✔️	✔️	✔️
PPTM	Microsoft PowerPoint Open XML Macro-Enabled Presentation file	✔️	✔️	✔️	✔️	✔️	✔️	✔️
PPSM	Microsoft PowerPoint Open XML Macro-Enabled Slide Show file	✔️	✔️	✔️	✔️	✔️	✔️	✔️
POTM	Microsoft PowerPoint template	✔️	✔️	✔️	✔️	✔️	✔️	✔️
JPEG	The image file format was standardized by the Joint Photographic Experts Group.	✔️	✔️		✔️		✔️
TIF/TIFF	Tagged Image File Format	✔️	✔️		✔️	✔️	✔️
PNG	Portable Network Graphics Image	✔️	✔️		✔️		✔️
BMP	Bitmap Image Files	✔️	✔️		✔️		✔️
GIF	Graphical Interchange Format Image	✔️	✔️		✔️
DJVU	DjVu Document Format	✔️			✔️

System Requirements

Overview

No external software required for GroupDocs.Redaction for .NET.
Follow instructions in Development Environment, Installation, and Configuration.

Supported Operating Systems

Windows: 2003, 2008, 2012, 2012 R2, 2016, 2019 Server, Vista, XP, 7, 8, 8.1, 10 (x64, x86)
UNIX: Linux or any platform supporting .NET Core 3.1

Supported Frameworks

.NET Frameworks: 2.0, 3.5, 4.0, 4.0_ClientProfile, 4.5.0, 4.5.1, 4.5.2, 4.6.0, 4.6.2, 4.7, 4.7.2, .NET Standard 2.0
.NET Core Framework: 2.0 and later

Development Environments

Visual Studio: 2010, 2011, 2012, 2013, 2015, 2017, 2019

Get Started with GroupDocs.Redaction for .NET

Below is an overview of the key steps and code examples that will help you begin using the API in your .NET applications.

Install GroupDocs.Redaction via NuGet

Package Manager GUI:
1. Open your solution/project in Visual Studio.
2. Navigate to Tools -> NuGet Package Manager -> Manage NuGet Packages for Solution.
3. Search for “GroupDocs.Redaction” and click “Install” to add the latest version to your project.
Package Manager Console:
1. Open Package Manager Console in Visual Studio.
2. Run the following command:
```
Install-Package GroupDocs.Redaction
```

Install from the Official GroupDocs Website

Download the package from the official website.
Unpack the archive or follow the MSI install wizard.
In Solution Explorer, right-click the References node and select “Add Reference.”
Locate and add the GroupDocs.Redaction.dll file.

Apply Exact Phrase Redaction

This code sample demonstrates how to apply an exact phrase redaction to a document, replacing a specific phrase with a custom string or a colored rectangle. This C# example shows how to redact sensitive information from a document by replacing exact phrases using GroupDocs.Redaction for .NET.

// Learn how to apply an exact phrase redaction to a document using GroupDocs.Redaction for .NET. Replace sensitive phrases with custom text or a color block.
// Import necessary namespaces
using GroupDocs.Redaction;
using GroupDocs.Redaction.Options;

namespace RedactionExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Load the document from the local file system
            using (Redactor redactor = new Redactor("sample.docx"))
            {
                // Apply an exact phrase redaction
                // Replace "John Doe" with "[personal]" in the document
                RedactorChangeLog result = redactor.Apply(new ExactPhraseRedaction("John Doe", new ReplacementOptions("[personal]")));

                // Check if the redaction was applied successfully
                if (result.Status != RedactionStatus.Failed)
                {
                    // Save the redacted document
                    redactor.Save();
                }
            }
        }
    }
}

Redact Metadata in a Document

This example demonstrates how to remove sensitive data from a document’s metadata using a regular expression. It targets specific metadata fields like the author’s name. This C# example demonstrates how to redact metadata in a document by targeting specific fields such as the author’s name using GroupDocs.Redaction for .NET.

// Redact metadata in a document using GroupDocs.Redaction for .NET. Remove or replace sensitive metadata fields like author names.
// Import necessary namespaces
using GroupDocs.Redaction;
using GroupDocs.Redaction.Redactions;
using GroupDocs.Redaction.Options;

namespace RedactionExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Load the document from the local file system
            using (Redactor redactor = new Redactor("sample.docx"))
            {
                // Create a metadata redaction targeting the author's name
                MetadataSearchRedaction redaction = new MetadataSearchRedaction("Company Ltd.", "--company--");

                // Apply the redaction to the document's metadata
                redactor.Apply(redaction);

                // Save the redacted document
                redactor.Save();
            }
        }
    }
}

Redact Image Area in a Document

This C# example demonstrates how to redact a specific area of an image embedded in a document by placing a colored rectangle using GroupDocs.Redaction for .NET.

// Redact specific areas within images embedded in documents using GroupDocs.Redaction for .NET. Overlay colored rectangles on sensitive image regions.
// Import necessary namespaces
using GroupDocs.Redaction;
using GroupDocs.Redaction.Redactions;
using System.Drawing;

namespace RedactionExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Load the document containing the image from the local file system
            using (Redactor redactor = new Redactor("sample.docx"))
            {
                // Define the area of the image to be redacted (coordinates and size)
                Point samplePoint = new Point(516, 311);
                Size sampleSize = new Size(170, 35);

                // Apply the redaction by placing a blue rectangle over the specified area
                RedactorChangeLog result = redactor.Apply(new ImageAreaRedaction(samplePoint, new RegionReplacementOptions(Color.Blue, sampleSize)));

                // Check if the redaction was applied successfully
                if (result.Status != RedactionStatus.Failed)
                {
                    // Save the redacted document
                    redactor.Save();
                }
            }XX
        }
    }
}

Please check the GitHub Repository for other common usage scenarios.

Direct Download

GroupDocs.Redaction for .NET 26.7

This contains the MSI installer of GroupDocs.Redaction for .NET

Added: 21/7/2026 Downloads: