.NET APIs to annotate and export annotated documents

.NET document annotation API to manage annotated notes, comments and tags to documents content within your applications

GroupDocs.Annotation for .NET

GroupDocs.Annotation for .NET API allows developers to seamlessly enhance their applications with the capability to annotate text or images in a document. Annotation can be applied in form of comments, explanations with highlighted notes, watermark, polyline and much more. Annotator API supports PDF, Microsoft Word DOCX, Excel XLSX and PowerPoint PPTX documents.

How to Annotate – Using GroupDocs.Annotation for .NET API annotations are created and rendered in a separate layer over displayed documents, so that original files are not modified. They can be stored as a set of JSON files or in a DB, as well as merged with the original file and exported to PDF or Word document.

At A Glance

An overview of .NET annotator API

Basic Annotations

Area
Point
Text
Strikeout
Underline
Polyline
Arrow
Watermark

Features

Abstract Storage
Export Annotations
Users Management
Reply Based Comments
Annotations Compatibility

GroupDocs.Annotation

API Supported Document Formats

Microsoft Office Formats

Microsoft Word: DOCX
Microsoft Excel: XLSX
Microsoft PowerPoint: PPTX

Other Formats

Portable Document Format: PDF
OpenDocument: OTP
Raster Images: BMP, GIF, JPG, PNG, TIFF
AutoCAD Images: CAD
Metafiles: EMF, WMF
Others: DICOM, DjVu

GroupDocs.Annotation

Comparison Matrix

GroupDocs.Annotation for .NET VS A.nnotate and PDF Annotator

GroupDocs.Annotation VS PDF Annotator VS A.nnotate

Advanced Document Annotation API Features

Annotate any PDF, DOCX, XLSX and PPTX documents

Multiple markup and commenting tools

Reply based comments

Highlight Text Annotation

Custom stamp Annotation

Threading in comments

Simultaneous document annotations by multiple users

Save annotations in different objects like JSON files, Databases or merge with original file

Export annotations to separate PDF or Word file

Import Annotations

Abstract storage option – achieve it by using implemented interface provided by API

User Management – Abstract-ready user management

Annotation Compatibility - Annotations added are compatible with native PDF annotations

Metered licensing

Core Annotations – markup and commenting tools

Area Annotation – Mark an area for annotation in form of notes. Area can be a line, paragraph or portion of document
Point Annotation – attach comments to any point
Text Annotation – add explanation to any selected text

Add text annotation - C#

 // Initialize list of AnnotationInfo
List<AnnotationInfo> annotations = new List<AnnotationInfo>();
 // Initialize text annotation
AnnotationInfo textAnnotation = new AnnotationInfo
{
	Box = new Rectangle((float)265.44, (float)153.86, 206, 36), Type = AnnotationType.Text 
};
// Add annotation to list
annotations.Add(textAnnotation);
// Export annotation and save output file
CommonUtilities.SaveOutputDocument("input.pdf", annotations, DocumentType.Pdf);

Strikeout / Underline Annotation – mark up text or revision instructions by editors with Strikeout or underline
Text replacement -Replace selected text
Text and Area redaction – blackout selected text and area within the document
Polyline – draw shapes and lines.
Pointer/arrow – attach arrows with notes
Watermark – add a watermark
Ruler or Distance Annotation – measure the distance between objects
Undo/redo – cancel or reverse annotations

Installation and Usage

API can be consumed on .NET Framework starting from V2.0 and Mono Framework starting from V1.2. Annotation API files can be installed/downloaded using following smooth ways