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[https://www.pdflabs.com/ PDF Toolkit], or pdftk for short, is a great [http://fsf.org free software] command-line program for manipulating documents in the Portable Document Format (PDF). To help regular users while also supporting the author and his free software work [https://www.pdflabs.com/ PDF Labs] now also offers (graphical) desktop versions. '''PDFTk Free''' will merge and split pdfs. '''PDFTk Pro''' will do other processing and costs a mere $3.99.