Flatten a PDF in Android

To flatten a PDF using default settings.

PDFDoc doc = new PDFDoc(filename);
Flattener fl = new Flattener();
fl.Process(doc, Flattener.e_fast);

Compress & optimize PDF files
Full code sample which shows how to use 'pdftron.PDF.Flattener' by simplifying page content (e.g. flattening complex graphics into images) while maintaining vector text.

PDF Flattener component (pdftron.PDF.Flattener) can be used to speed-up PDF rendering on mobile devices and on the Web.

PDF documents can frequently contain very complex page description (e.g. thousands of paths, different shadings, color spaces, blend modes, large images etc.) that may not be suitable for interactive viewing on mobile devices.

Flattener can be used to speed-up PDF rendering on mobile devices and on the Web by simplifying page content (e.g. flattening complex graphics into images) while maintaining vector text whenever possible.

Flattener can also be used to simplify process of writing custom converters from PDF to other formats. In this case, Flattener can be used as first step in the conversion pipeline to reduce any PDF to a very simple representation (e.g. vector text on top of a background image).

A quick way to try Flattener is by using DocPub CLI (e.g. docpub -f pdf my.pdf).