In this how-to tutorial, we will explain to you the step-by-step process to extract annotations from PDF in Java. We will use one of the popular annotation libraries for extracting annotations from the PDF document and consume a few API calls to do the task. Further, we will teach how to use this guide to develop the feature to extract annotations in Java.

Steps to Extract Annotations from PDF in Java

1. Install GroupDocs.Annotation for Java from the Maven repository
2. Add a reference to the necessary classes for extracting annotations from PDF document
3. Load the input PDF file by passing it to the constructor of the Annotator class
4. Create an instance of the LoadOptions class
5. Call the get method of the Annotator class for fetching the annotations

In the above section, you can see the detailed instructions to develop the capability to extract annotations using Java. In the first step, you have to install the library from the Maven repository and import the necessary classes for performing the annotation extraction. In the next step, create an instance of the LoadOptions class, initialize the Annotator class and pass the input PDF file to its constructor along with the loadOptions object. After that, extract all the annotations by using the get method of the Annotator class.

Code to Extract Annotations from PDF in Java

We have developed a Java annotation example to show you the implementation using the instructions defined in the previous section. We have extracted annotations from PDF without installing any third-party software and with a few lines of code. Moreover, you can provide any source document to extract annotations.