.NET Standard 2.0 .NET Framework 4.6.1
There is a newer version of this package available.
See the version list below for details.
NuGet\Install-Package GrapeCity.Documents.Pdf.ViewerSupportApi -Version
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
dotnet add package GrapeCity.Documents.Pdf.ViewerSupportApi --version
<PackageReference Include="GrapeCity.Documents.Pdf.ViewerSupportApi" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add GrapeCity.Documents.Pdf.ViewerSupportApi --version
#r "nuget: GrapeCity.Documents.Pdf.ViewerSupportApi,"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install GrapeCity.Documents.Pdf.ViewerSupportApi as a Cake Addin
#addin nuget:?package=GrapeCity.Documents.Pdf.ViewerSupportApi&version=

// Install GrapeCity.Documents.Pdf.ViewerSupportApi as a Cake Tool
#tool nuget:?package=GrapeCity.Documents.Pdf.ViewerSupportApi&version=


The GrapeCity.Documents.Pdf.ViewerSupportApi package implements the server-side Support API for the GrapeCity Documents PDF Viewer (GcPdfViewer), and can be used in ASP.​NET Core and Web Forms projects. GcPdfViewer is a JavaScript client-side control that is available on npmjs: It is a part of the GrapeCity Documents for PDF product. GcPdfViewer can be used as a powerful client-side only PDF viewer. If connected via Support API to a backend running GcPdf on the server, the viewer enables:

  • Customizable and mobile-friendly PDF form filler
  • Real-time collaborative editing mode
  • Annotation and form editors
  • Quick edits using secondary toolbars
  • PDF redaction
  • Signature verification
  • Predefined stamps
  • Other editing features

The full source code of this library together with C# demo projects for ASP.​NET Core and Web Forms is included in the src/ folder in this package. The WEB_FORMS constant is defined for the Web Forms target.


GrapeCity Document APIs

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated 57 9/16/2022 107 8/24/2022 92 8/15/2022 89 7/29/2022 164 7/15/2022 235 6/10/2022 147 5/23/2022 186 4/29/2022 187 4/19/2022

# Changes since version

## Fixed
- [Regression in v5.1.0.794] - Stamp image changed after saving the modified PDF. (DOC-4464)
- [Regression in v5.1.0.794] - Signature lost after saving the modified PDF. (DOC-4462)
- Stamp annotation's size increases after saving the modified PDF. (DOC-4318)