Foxit PDF Conversion SDK

Developer Guide for Foxit PDF Conversion SDK 1.0 (C)

Introduction to Foxit PDF Conversion SDK

Foxit PDF Conversion SDK is a flexible high-performance library to actually convert PDF files to MS office suite formats, and keep the layout and format of your original documents. It offers advanced conversion quality and the same quality and user experience as all Foxit products. The engine for creating MS office files is developed independently by Foxit, no 3rd party office engine is required to be pre-installed on your machine, and no intellectual infringement. It can be used as a stand-alone or as an add-on to the general Foxit PDF SDK.

Why Foxit PDF Conversion SDK is your choice

Foxit is a leading software provider of solutions for reading, editing, creating, organizing, and securing PDF documents. Foxit PDF SDK libraries have been used in many of today’s leading apps, and they are proven, robust, and battle-tested to provide the quality, performance, and features that the industry’s largest apps demand. Foxit PDF Conversion SDK is a new SDK product independently developed by Foxit. Customers choose Foxit PDF Conversion SDK for the following reasons:

Easy to integrate

Developers can seamlessly integrate Foxit PDF Conversion SDK into their own applications.

Lightweight footprint

Do not exhaust system resource and deploys quickly.

Independentlydeveloped engine

The core technology of the Conversion SDK is developed independently by Foxit.

Premium World-side Support

Foxit offers premium support for its developer products because when you are developing mission critical products you need the best support. Foxit has one of the PDF industry’s largest team of support engineers. Updates are released on a regular basis to improve user experience by adding new features and enhancements.

Foxit PDF Conversion SDK for C API

In this guide, we focus on the introduction of Foxit PDF Conversion SDK for C API on Windows platform. Foxit PDF Conversion SDK for C API ships with simple-to-use APIs that can help C developers convert PDFs to office files (includes word/Excel/PowerPoint).


Foxit PDF Conversion SDK allows users to download trial version to evaluate SDK. The trial version has no difference from a standard version except for the 14-day limitation trial period. After the evaluation period expires, customers should contact Foxit sales team and purchase licenses to continue using Foxit PDF Conversion SDK.


Developers should purchase licenses to use Foxit PDF Conversion SDK in their solutions. Licenses grant users permissions to release their applications based on PDF SDK libraries. However, users are prohibited to distribute any documents, sample codes, or source codes in the SDK released package to any third party without the permission from Foxit Software Incorporated.

About this guide

This guide is intended for the developers who need to integrate Foxit PDF Conversion SDK with C program language into their own applications. It aims at introducing the installation package, and the usage of SDK.

Getting Started

It’s very easy to setup Foxit PDF Conversion SDK and see it in action! This guide will provide you with a brief introduction about our SDK package. The following sections introduce the contents of system requirements, the installation package as well as how to run a demo, and how to initialize Foxit PDF Conversion SDK.

System Requirements

Platform System Requirement Memo
Windows Windows Vista, 7, 8 and 10 (32-bit and 64-bit) Windows Server 2003, 2008 and 2012 (32-bit and 64-bit) It only supports for Windows 8/10 classic style, but not for Store App or Universal App.

What is in the package

In this guide, one thing to note is that the highlighted rectangle in the figure is the version of the SDK. Here the SDK version is 1.0, so it shows 1_0.

Download Foxit PDF Conversion SDK zip for C API package and extract it to a new directory “foxitpdfconversionsdk_1_0_win_c”, which is shown in Figure 2-1. The release package contains the following folders:

doc: API references, developer guide

examples: sample demo

include: header files for Foxit PDF Conversion SDK API

lib: libraries and license files

res: font-related configuration files

Figure 2-1

Note: In “res\metrics_data” folder, it contains the metrics data files which are used to simulate the office format document typesetting process during conversion.

How to run a demo

Foxit PDF Conversion SDK provides a pdf2office demo in the “examples” folder. To run the demo in Visual Studio, you can follow the steps below:

Load the visual studio solution file “simple_demo_vs2010.sln” or “simple_demo_vs2015.sln” or “simple_demo_vs2017.sln” (depending on your Visual Studio version) in the “\examples\simple_demo” folder.

Build the demo by clicking “Build > Build Solution”.

After building, the executable file “.exe” will be generated in the “\examples\simple_demo\bin” folder. And the name of the executable file depends on the build configurations.

Run the executable file, just double-click it.

The output files (word, excel, and powerpoint) will be generated in the “examples\simple_demo\output_files\pdf2office” folder.

Note: If you want to see the detailed executing processes, you can run it in command line. Start “cmd.exe”, navigate to “\examples\simple_demo\bin”, and run the executable file.

How to initialize Foxit PDF Conversion SDK

It is necessary for apps to initialize Foxit PDF Conversion SDK using a license before calling any APIs. The trial license files can be found in the “lib” folder.

const char* sn = " ";
const char* key = " ";
FSErrorCode code = FSDK_Library_Initialize(sn, key);
if (code != e_FSErrSuccess) {
       return false;

Note The value of “sn” can be got from “conversionsdk_sn.txt” (the string after “SN=”) and the value of “key” can be got from “conversionsdk_key.txt” (the string after “Sign=”).


How to fix the “xcopy‘ exited with code 9009″ error when building demo in Visual Studio?

When building demo in Visual Studio, if you encounter the error “‘xcopy’ exited with code 9009” as follows:

'xcopy ..\..\..\..\..\..\lib\conversionsdk_sn.txt ..\..\..\ /y > null
xcopy ..\..\..\..\..\..\lib\conversionsdk_key.txt ..\..\..\ /y > null
xcopy ..\..\..\..\..\..\lib\$(PlatformName)_vc10\fpdfconversionsdk_c_win32.dll..\..\..\ /y > null
xcopy ..\..\..\..\..\..\lib\$(PlatformName)_vc10\fpdfconversionsdk_c_win64.dll..\..\..\ /y > null' exited with code 9009

Please check the following points:

Check whether the xcopy.exe is in the %SystemRoot%\System32″ directory, if not, copy one from another machine.

Check whether the system PATH environment variables have been set correctly. It should contain “%SystemRoot%\System32;%SystemRoot%;, if the environment variables for xcopy is right, but it still reports the error, please put the path of xcopy in front of others. Maybe some other environment variables have spell mistakes, so that cause the subsequent environment variables are invalid. Please check it.

After checking, open a command prompt, type xcopy command, if it can be recognized, close Visual Studio, and restart the demo. The error should be fixed.


Foxit Support

In order to provide you with a more personalized support for a resolution, please log in to your Foxit account and submit a ticket so that we can collect details about your issue. We will work to get your problem solved as quickly as we can once your ticket is routed to our Support team.

You can also check out our Support Center, Choose Foxit PDF SDK Where has lots of helpful articles that might help with solving your issue.

Phone Support:

Phone: 1-866-MYFOXIT or 1-866-693-6948

Updated on March 21, 2024

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