Do you want to split, merge, encrypt or decrypt your PDF files? Now all these can be done easily with PDFToolkit.
PDFToolkit is an all in one PDF tool. It can split, merge, encrypt and decrypt PDF easily. It is a standalone application and does not depend on Adobe Acrobat, or even Acrobat Reader.

PDFToolkit can be used to split files by pages, you can split the file into single pages or save every a few pages as a new file, it also can be used to merge multiple PDF files or selected pages from one or more files into a PDF file, preservation of original links, and form fields.

PDFToolkit can encrypt PDF with standard 40-bit or 128-bit encryption. You can also set the permission of the user such as printing, modifying etc. You can make secure PDF and protect your PDF in one function call.

PDFToolkit also provides the ability to decrypt an encrypted PDF given the password.

Features:
Split PDF files into multiple files by range

Merge multiple PDF files into one PDF

Standalone, doesn't depend on Adobe Acrobat or Reader

Encrypt PDF, decrypt PDF

Supports PDF user password and owner password protection

Password protect opening of the PDF document

Disable printing of the PDF document

Disable copying of text/graphics

Disable modifications to PDF the document

Password protection for PDF files with 40 or 128 bit encryption

Support batch processing a lot of PDF files in one click