How to Add Digital Signatures in a GIF File

The below code example clearly demonstrates the steps about how to add digital signatures to a GIF file using GroupDocs.Signature library in Java by adding just a few lines of code.

Create new instance of Signature class and pass source document path as a constructor parameter.
Instantiate the DigitalSignOptions object with required certificate & password.
Call Sign method of Signature class instance; pass DigitalSignOptions to it.
Analyze SignResult result to check newly created signatures if needed.

System Requirements

GroupDocs.Signature for Java APIs are supported on all major platforms and operating systems. Before executing the code below, please make sure that you have the following prerequisites installed on your system.

Operating Systems: Microsoft Windows, Linux, MacOS
Development Environments: Visual Studio, Xamarin, MonoDevelop
Frameworks: .NET Framework, .NET Standard, .NET Core, Mono
Download the latest version of GroupDocs.Signature for Java from NuGet

Signature signature = new Signature("sample.pdf"); 
DigitalSignOptions options = new DigitalSignOptions("certificate.pfx");
 
// certifiate password
options.setPassword("1234567890");
// digital certificate details
options.setReason("Sign");
options.setContact("JohnSmith");
options.setLocation("Office1");
 
// image as digital certificate appearance on document pages
options.setImageFilePath("sample.jpg");
//
options.setAllPages(true);
options.setWidth(80);
options.setHeight(60);
options.setVerticalAlignment(VerticalAlignment.Bottom);
options.setHorizontalAlignment(HorizontalAlignment.Right);
Padding padding = new Padding();
padding.setBottom(10);
padding.setRight(10);
options.setMargin(padding);
 
SignResult signResult = signature.sign("signed.gif", options);
// analyzing result
System.out.print("List of newly created signatures:");
int number = 1;
for(BaseSignature temp : signResult.getSucceeded())
{
    System.out.print("Signature #"+ number++ +": Type: "+temp.getSignatureType()+" Id:"+temp.getSignatureId()+
            ",Location: "+temp.getLeft()+"x"+temp.getTop()+". Size: "+temp.getWidth()+"x"+temp.getHeight());
}

What is GIF File Format

A GIF or Graphical Interchange Format is a type of highly compressed image. Owned by Unisys, GIF uses the LZW compression algorithm that does not degrade the image quality. For each image GIF typically allow up to 8 bits per pixel and up to 256 colours are allowed across the image. In contrast to a JPEG image, which can display up to 16 million colours and fairly touches the limits of the human eye. Back when the internet emerged, GIFs remained the best choice because they required low bandwidth and compatible for the graphics that consume solid areas of colour. An animated GIF combines numerous images or frames into a single file and displays them in a sequence to generate an animated clip or a short video. The colour limitations are up to 256 for each frame and are likely to be the least suitable for reproducing other images and photographs with colour gradient. Learn more about GIF file format

Other Available Options

Multi-format digital signatures API for documents and images. Add signatures to some of the popular file formats as stated below.

Add Digital Signatures to GIF in Java

Secure your GIF files by adding popular digital signature types using Java library. Manipulate electronic signatures properties and set up advance signing options within documents as you may need.

About GroupDocs.Signature for Java API

How to Add Digital Signatures in a GIF File

System Requirements

Add GIF Signature Live Demos

What is GIF File Format

Other Available Options