Version 4.1.6 Released
Enhanced version of the PDFTK Builder GUI for PDF Toolkit on Windows
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Version 4.1.6 (28 May 2021) is a minor update to PDFTK Builder Enhanced that adds a red indication on the Document Protection panel button when encryption of output PDFs is in effect. This indication is visible even when the Document Protection panel is collapsed. Encryption of output PDFs is set by entering one or both passwords. In general, encryption should be avoided since it complicates use/distribution of PDFs and compatibility with other PDF tools. Also note that the underlying PDFTK Server command line tool only supports 40-bit and 128-bit RC4 encryption rather than the newer 128 and 256-bit AES. See pages 20-21 of the updated User Manual (PdftkBuilder.pdf) for further information.
If you have an existing installation of PDFTK Builder Enhanced, you can either unzip the new distribution file (PdftkBuilder-4.1.6-portable.zip) to a new folder or overwrite the contents of your existing folder. If you have customized the .ini file and are overwriting your old files, you may want to save a copy of your existing PdftkBuilder.ini file so you can then replace the default .ini file included in the download.
I found a small issue with output size when we split pages in this version, imagine the size of the main file is 1.2mb with 20 pages and I'm splitting the 1st page.
output size of file is 345kb in PDFTK Builder Enhanced
in PDFsam I get 64kb only.
PDFTK Builder Enhanced is just a GUI for the underlying PDFtk command line tool, PDFtk Server v2.02, which actually generates the PDF files. In general, I would expect the file sizes to be similar when splitting files, even though the Sejda PDF Java SDK underlying PDFsam Basic is actively maintained and marketed, while the last release of PDFtk Server was back in 2013. Since you did not furnish a copy of the original PDF file that you split, there is no way to determine why the file for the first page produced by PDFtk Server is larger; e.g., possibly due to a difference in handling later PDF versions, compression, fonts, etc. or a malformed input PDF.
Also note that the functionality provided by the PDFsam Basic product is more limited than PDFtk Builder Enhanced due to the larger scope of PDF operations accessible in the GPL PDFtk command line tool and the simplicity of using the command line tool from scripts and in applications developed in other programming languages.