PDF.js Express Web Viewer is able to import and export PDF annotations with the XFDF format. XFDF is an XML-based standard that is able to represent information about annotations. Saving and loading annotations in PDF.js Express is the process of saving and loading this XFDF data.
We will go through relevant APIs and examples for different scenarios in the following guides:
Importing and exporting annotations using a file
To import and export XFDF annotations using a file.
Importing and exporting annotations using a database
To import and export XFDF annotations using a database.
A short introduction to XFDF file format
An introduction to XFDF file format