The Syncfusion® native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
.NET PDF framework is a high-performance and comprehensive library used to create, read, merge, split, secure, edit, view, and review PDF files in C#/VB.NET.
AAAkshaya Arivoli Syncfusion Team February 18, 2020 11:48 AM UTC
Hi Jaime,
Thank you for contacting Syncfusion support.
We can save the annotations in sever the Import/Export Annotations option provided in the comment panel of the PDF Viewer control. We can also import/export the annotations using the exportAnnotations() and importAnnotations() API available in PDF Viewer.
Note: ExportAnnotations will download the annotations as JSON object.
We can also use the exportAnnotationsAsObject to get the exported annotation object in the client side. We have created sample for the same and shared in the below link,