FolderMill 4.4: Merge, Split, Compress PDF in Batches

FolderMill, a document processing software program for Windows, has gotten a new update! You can now exercise finer control over your document-related workflows with new useful features such as adding new pages to the beginning of PDF or TIFF files, a new PDF compression method, crop mark printing and more.

This program, based on Hot Folder monitoring, performs batch processing of different types of files real-time. Our printing and conversion software lets users save time when working with multiple documents. You can assign different tasks to Hot Folders, which will be performed simultaneously. The program starts processing files, as soon as they are placed into a Hot Folder.

What’s new in version 4.4:


  • Insert pages before existing PDF or TIFF files
  • New PDF compression function
  • Print crop marks for PDF
  • Set paper size for cover pages
  • Exclude subfolders from processing


  • Improved Filter by Paper Size: better paper size detection
  • Improved Add text or watermark Action parameters
  • Improved log file processing
  • Improved Windows 10 menu icons and new Action icons


  • Fixed binary and dynamic library files (.exe, .dll)
  • Fixed Convert to XPS plugin
  • Fixed paper size format display in Filter by paper size Action

Insert pages before existing PDF or TIFF files

Insert pages before existing PDF or TIFF with FolderMill

Now you can combine PDF files with more available options. FolderMill can already append new pages to existing PDF files, but now you can add them not just to the end of a document, but also to the beginning. In order to insert pages before an existing PDF, prompt the Convert to PDF Action and select Insert before existing PDF file from the dropdown menu:

Merge PDF files with FolderMill

You can join or split PDFs – just set up PDF file processing using 1 of 4 additional options available:

  • Keep as is. Retains original structure. Does not combine files in any way.
  • Split into single pages. Creates a separate file for each page.
  • Append to existing PDF file. Merges new file with existing PDF (adds pages to the end).
  • Insert before existing PDF file. Merges new file with existing PDF (adds pages to the beginning).

If you need to merge multiple PDF pages in a certain order and document cover pages must be at the very beginning, this is no longer a problem.

You can also merge TIFF files using the same options – by appending or prepending new files to existing ones. Select Append to existing TIFF file or Insert before existing TIFF file in the Convert to Image Action parameters. This adds new files to the back or front of your multipage TIFF file.

New PDF compress function  

Compact and compress PDF document with FolderMill

The new FolderMill can reduce the size of your output PDF documents without significant quality loss. This function uses a special processing method that compacts PDF files and maintains good quality. It resizes images within PDFs to lower resolutions and compresses them by removing embedded fonts. This type of compression is fairly complex and can take some time for larger documents. All in all, this function is a good way to reduce output size, even though processing may take a bit longer than usual.

How to reduce PDF file size with FolderMill

Follow these steps to enable this PDF compressor:

  1. Create a new Hot Folder
  2. Add Convert to PDF Action
  3. Open Action parameters by pressing Ctrl + Alt + i
  4. Find line Optimize=0 and change it to Optimize=1.

When you split PDFs, you can set a number for each file by adding corresponding page numbers into the file name. To set the template for the file name of your output PDFs, modify the line OutFilenameTemplate=”{Name}{-Page}.{Type}”. You can find this in the Edit Settings window once you add an Action and press Ctrl + Alt + i when Action parameters window is displayed.

Print crop marks

You can now add crop marks (cut marks / trim marks) when using FolderMill’s Print Document Action. Crop marks define where to trim a printed document. These thin lines are printed in the corners of a PDF documents or image files. This feature can prove invaluable when you need to crop margins around an object that lacks distinct borders. Printers generally can’t typically print at the very edge of the paper, so in order to make crop marks visible, print on a sheet of paper larger than the final dimensions of your image or document.

To print cut marks, add a new Print document Action and press Ctrl + Alt + i when the Action parameters window appears. Find line PrintCutmarks=0 and change it to PrintCutmarks=1.

Set paper size for cover pages

Now you can set the desired paper format (size) for cover pages. FolderMill optionally inserts a cover page to separate the printed hard copies of documents. By default, cover pages have an A4 paper format, but now you can alter this paper size.

To set a certain paper size for service pages, add new Print Document Action, tick the box for Print cover page, open Ini File Editor by pressing Ctrl + Alt + i and find line AdditionalPaperSize=”” in the [General] section. Change this line to one of the lines below to specify the necessary paper format:

Line & value Paper size
AdditionalPaperSize=”” A4 (default)
AdditionalPaperSize=”A0″ A0
AdditionalPaperSize=”A1″ A1
AdditionalPaperSize=”A2″ A2
AdditionalPaperSize=”A3″ A3
AdditionalPaperSize=”A4″ A4
AdditionalPaperSize=”A5″ A5
AdditionalPaperSize=”A6″ A6
AdditionalPaperSize=”B0″ B0
AdditionalPaperSize=”B1″ B1
AdditionalPaperSize=”B2″ B2
AdditionalPaperSize=”B3″ B3
AdditionalPaperSize=”B4″ B4
AdditionalPaperSize=”B5″ B5
AdditionalPaperSize=”B6″ B6
AdditionalPaperSize=”ANSI-A” ANSI-A
AdditionalPaperSize=”ANSI-B” ANSI-B
AdditionalPaperSize=”ANSI-C” ANSI-C
AdditionalPaperSize=”ANSI-D” ANSI-D
AdditionalPaperSize=”ANSI-E” ANSI-E
Common loose sizes
AdditionalPaperSize=”Letter” Letter
AdditionalPaperSize=”Tabloid” Tabloid
AdditionalPaperSize=”Legal” Legal
AdditionalPaperSize=”Statement” Statement
AdditionalPaperSize=”Executive” Executive
AdditionalPaperSize=”Folio” Folio
AdditionalPaperSize=”Quarto” Quarto
AdditionalPaperSize=”Note” Note
AdditionalPaperSize=”Envelope#9″ Envelope#9
AdditionalPaperSize=”Envelope#10″ Envelope#10
AdditionalPaperSize=”Envelope#11″ Envelope#11
AdditionalPaperSize=”Envelope#12″ Envelope#12
AdditionalPaperSize=”Envelope#14″ Envelope#14
AdditionalPaperSize=”Envelope#16″ Envelope#16
AdditionalPaperSize=”EnvelopeC3″ EnvelopeC3
AdditionalPaperSize=”EnvelopeC4″ EnvelopeC4
AdditionalPaperSize=”EnvelopeC5″ EnvelopeC5
AdditionalPaperSize=”EnvelopeC6″ EnvelopeC6
AdditionalPaperSize=”EnvelopeC65″ EnvelopeC65
AdditionalPaperSize=”EnvelopeB4″ EnvelopeB4
AdditionalPaperSize=”EnvelopeB5″ EnvelopeB5
AdditionalPaperSize=”EnvelopeB6″ EnvelopeB6
AdditionalPaperSize=”EnvelopePersonal” EnvelopePersonal
AdditionalPaperSize=”EnvelopeMonarch” EnvelopeMonarch
AdditionalPaperSize=”ARCH A” ARCH A
AdditionalPaperSize=”ARCH B” ARCH B
AdditionalPaperSize=”ARCH C” ARCH C
AdditionalPaperSize=”ARCH D” ARCH D
AdditionalPaperSize=”ARCH E” ARCH E
AdditionalPaperSize=”ARCH E1″ ARCH E1
AdditionalPaperSize=”ARCH E2″ ARCH E2
AdditionalPaperSize=”ARCH E3″ ARCH E3

Exclude subfolders from processing

By default, the program processes files from all folders within a Hot Folder. With the new version of FolderMill, you can disable subfolder processing within a specified Hot folder. With this option on, FolderMill processes only those files placed in Hot Folders, not subfolders.

To activate this feature, create a Hot Folder, add an Action or a series of Actions and apply necessary settings. Then press Ctrl + Alt + R to open advanced Hot Folder settings, find line RecurseSubfolders=1 and change it to RecurseSubfolders=0:

Exclude subfolders from processing with FolderMill

You can do the same for all Hot Folders – just open advanced settings on the FolderMill Control Panel (Ctrl + Alt + G) and set RecurseSubfolders to 0.

Improved Filter by Paper Size: better paper size detection

FolderMill can include or exclude certain files from processing based on paper size format via the Filter by Paper Size Action. We’ve improved this Action by adding tolerance according to ISO 216 standards. Now, FolderMill detects paper sizes better thanks to allowable variation for paper size dimensions.

The tolerances specified in the standard are:

  • ±1.5 mm for dimensions up to 150 mm
  • ±2.0 mm for dimensions in the range 150 to 600 mm
  • ±3.0 mm for dimensions above 600 mm

Other improvements and fixes

FolderMill has undergone a series of other minor improvements and fixes:

  • Improved Add text or watermark Action. Application of watermark now works better thanks to improved parameters for margins and align.
  • Improved processing of log files. Log files have been reworked and now have more relevant and less unnecessary information.
  • Improved Windows 10 menu icons and new Action icons. We added new shortcut icons for Windows 10 users and new icons to better illustrate Actions.
  • Fixed binary and dynamic library files (.exe, .dll). Dynamic library files and binary files (.exe .dll) now have correct metadata, such as copyright, product number, etc.
  • Fixed Convert to XPS plugin. Convert to XPS plugin, available by request, has been improved & fixed.
  • Fixed paper size format display in Filter by paper size Action. In the past, paper size values were incorrectly displayed in some cases. They have now been corrected.