The  first commercial server application for filling PDF forms, FDFMerge has made it easy to programmatically populate, control and flatten PDF forms for quick delivery to end users, since 1998. End-users need only the free Adobe Reader® or a third party PDF viewer to view and download their completed forms.

FDFMerge 7 is implemented in high demand applications, and is engineered to meet mission-critical on-demand and high-volume form-filling needs. The software can be used in many different ways to capture data from end-users, whether you are implementing a Banking or Financial Services forms process or a Government-to-Citizen (G2C) forms process. FDFMerge can be easily integrated into an existing or new forms portal.

For basic merging of form data, consider FDFMerge Lite (see the Compare tab). Combine flattened PDF forms with AppendPDF or AppendPDF Pro.

Representation of FDF Merge functionality


FDFMerge Full Featured Form Handling

  • Fill PDF forms with data from plain-text Forms Data Format (FDF) files or XML Forms Data Format (XFDF) files
  • Place PDF, JPEG or TIFF graphics into fields
  • Remove active form fields, embedding field content directly into the document ( Form Flattening )
  • Flatten selected fields or the entire form ( Partial Form Flattening )
  • Dynamically change form field border width, color and background color
  • Dynamically Format text fields, including font, point size, alignment, color, and more
  • Use advanced typography – manage character and word spacing and line leading
  • Support for both RGB and CMYK color
  • Run commands using Command Collections for even greater performance!

File Handling Options

  • Process multiple forms using one FDF or XFDF file
  • Apply 40-bit or 128-bit file encryption with user password to control who may view, print, or modify a document
  • Linearize output PDFs for faster access and viewing when downloaded from the Web or a network (Fast Web View)
  • Incremental or Full save to optimize speed, memory usage, and output file size
  • Optimize to reduce file size

ISO 32000 compliance. Set the output file version for ISO 32000 compliance (Adobe PDF version 1.7).

Representation of FDF Merge functionality

Tech Specs

Easy Integration with FDFMerge

  • No limit on concurrent users or connections
  • No limit on the number of documents processed
  • No limit on threads – run as many instances as you want
  • Call from any programming or scripting language including (but not limited to) Perl, PHP, Java, C++, ASP & .Net, Visual Basic, Cold Fusion and Lotus Notes
  • May be integrated with other Appligent Document Solutions server products as part of a complete PDF workflow solution
  • Supports PDF 1.0 and higher

Supported Operating Systems

Microsoft Windows
Windows 7 and higher (32 or 64 bit)

Linux (RedHat, SUSE, Ubuntu, etc.)
Kernel 2.6, 32 bit
Kernel 2.6  64 bit

5.2 & above on Power

Oracle (Sun) Solaris
10 and above on SPARC

Hewlett-Packard HP-UX
11i v2 & above on Itanium

Apple Mac OS X
10.5 & above on Intel x86

Minimum free memory available to run the application : 512 MBytes


On the Web, use FDFMerge with a CGI script to dynamically create forms based on data users submit from their browsers. In an electronic document workflow, FDFMerge can be scripted for multistage processing and used with our other products as part of a complete PDF workflow solution.


Representation of FDF Merge functionality


Feature FDFMerge FDFMerge Lite
Fill data into single or multi-page Acrobat PDF forms ( AcroForms ) Yes Yes
Process multiple forms using only one field data file ( FDF or XFDF ) Yes Yes
Flatten all field in the form directly into the document page content Yes Yes
Selectively flatten individual form fields directly into the document page content ( Partial Form Flattening ) Yes No
Save as Fast Web view ( Linearize ) Yes Yes
Encrypt and Set Permissions of output PDF Yes Yes
Support for Unicode to place Chinese, Japanese or Korean (CJK) data in form fields Yes Yes
Supports Extensible Markup Language ( XML) to specify form field data Yes Yes
Supports FormInfo file for Dynamic Global or Individual field customization Yes No
Dynamic customization of all form fields Yes No
Dynamic customization of individual form fields Yes No
Dynamically Specify individual field Font Name and Font Size for text fields Yes No
Dynamically Specify individual field Font Color using Grayscale, RGB or CMYK Colors Yes No
Dynamically Specify individual field Character Spacing, Word Spacing and Line Spacing Yes No
Dynamically Specify individual field Justification and Crop Yes No
Dynamically Specify individual field Border and Background Visibility Yes No
Dynamically Specify individual field Border and Background Color using Grayscale, RGB or CMYK Colors Yes No
Stamp PDF Pages from Multi-Page PDF files onto any form fields Yes No
Stamp JPEG or TIF images onto any form fields Yes No
Representation of FDF Merge functionality

Sample Scripts

Sample Scripts and Code

The following examples show only the critical elements needed to set up the command line call, invoke the application and capture the returned code.  Contact us if you need assistance in developing PHP or Perl scripts for our applications

The Command Line Interface (CLI) is a powerful programming technique useful in any server environment. All Appligent Document Solutions server-based applications include a CLI and can easily be placed in any workflow, using any programming language or scripting environment. In addition, most of the Appligent applications also support Watched Folders and/or Watched Directories for easily fitting into just about any workflow.

Please see the documentation for the specific product to learn about all of the product features at

NOTE: We use FDFMerge to demonstrate the correct syntax below, but the name of any of our server-based applications may be substituted.

Download complete PHP example.

PHP sample script
PHP sample script

Download complete ASP example.

ASP sample script
ASP sample script

Download complete Pearl example.

PERL sample script
PERL sample script

Download complete Java example or alternate example.

JAVA Sample script
JAVA Sample script

Download complete Visual Basic example.

Visiual Basic sample script
Visual Basic sample script
Representation of FDF Merge functionality

Try & Buy

How to Buy FDFMerge

FDFMerge starts at $1,995.00 (USD) for a single server with up to 4 cores. FDFMerge Lite starts at $995.  Contact us for more information.

Download from the Appligent Web Store

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FDFMerge - Add Powerful Form and Data Integration to Your PDF Forms