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.
Note: Annotations made in the web viewer cannot be baked into the underlying PDF document.
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.
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A short introduction to XFDF file format
An introduction to XFDF file format
