PDFtk Free is designed for basic PDF merging and splitting, while PDFtk Pro adds GUI-based features like watermarking, page rotation, and encryption. However, the command-line PDFtk Server provides all Pro features for free, and third-party tools like PDFTK Builder Enhanced offer free graphical interfaces for these advanced tasks. For more details, visit PDF Labs pdflabs.com/tools/ and PDFTK Builder Enhanced sourceforge.net/projects/pdftk-builder-enhanced/. PDFTK Builder Enhanced download | SourceForge.net
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