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jPDFAssemble
jPDFAssemble Java library merges, splits, & modifies PDF files, works cross-platform.
jPDFImages
jPDFImages Java library for exporting/importing images from PDF files.
jPDFPreflight
Java library ensures PDF compliance with jPDFPreflight.
jPDFSecure
jPDFSecure digitally signs PDF documents using Java library.
jPDFWeb
jPDFWeb: Java library for converting PDF to HTML5 / SVG.