Qoppa’s Java PDF Library, jPDFoptimizer can optimize PDF documents and reduce file sizes. . It is s based on Qoppa’s high quality PDF technology supports the following functions:

Optimize Images in a PDF document
Change compression, DPI, quality and color spaces.

Remove Objects in a PDF documents
Remove alternate images, bookmarks, attachments, JavaScript actions, metadata, comments, document info, form fields, embedded thumbnails, signatures, unused objects.

Advanced Options to Optimize a PDF Document
Flatten comments, flatten fields, flate uncompressed content streams, merge duplicate images, merge duplicate fonts.

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