Save a document as blob
Get the contents of the document as a blob.
Extract annotations from an existing document
Take a users existing document and get the annotations from it in XFDF format
Extract user annotations (XFDF)
Export the annotations a user has created as XFDF. Commonly used to save annotations in a database.
PDF.js Express Web Viewer API
PDF.js Express is a commercial PDF web viewer that wraps around the PDF.js open-source rendering engine.