PDFTK Builder is a free and open-source graphical interface for pdftk (PDF Toolkit), a command-line tool used to manipulate PDF files. It simplifies the use of pdftk, allowing users without command knowledge to perform tasks such as:
Merge PDFs: Combine multiple PDF files into a single document.
Split PDFs: Separate pages from a PDF into individual files or extract specific pages.
Rotate pages: Rotate pages at specific angles (90°, 180°, etc.).
Add passwords: Protect PDFs with passwords or permissions.
Add watermarks: Insert watermarks or stamps on pages.
Organize pages: Reorder, delete, or duplicate pages from a PDF.