Documentation

Explore the docs

Select your platform

Windows

Developer Guides

API Reference

Web

Developer Guides

API Reference

Collaboration API Reference

PDF Conversion SDK

Developer Guides

API Reference

Mac

Developer Guides

API Reference

Linux

Developer Guides

API Reference

Android

Developer Guides

API Reference

iOS

Developer Guides

API Reference

ActiveX

Articles & Project samples

Latest release

Foxit 10.1

Foxit PDF SDK for Desktop 10.1.0 supports PDF/E and PDF/X standards in preflight checks, enhances the conversion workflows and OCR capabilities with the support of multi-threaded/multi-core processing and additional options, and improves the performance in document optimization and form file import processes. It also adds new APIs in modules like search, image processing, and text processing to deliver a streamlined workflow.

Foxit Conversion SDK 2.1.0 brings enhanced features to PDF2Office and Office2PDF, providing users with a more versatile and efficient document conversion experience. For PDF2Office, users can now convert the restricted PDF files and benefit from additional options to remove trailing spaces from the output, specify Excel workbook settings, and control whether to include images or insert page breaks during conversion. Office2PDF introduces the support for outline conversion in Word2PDF, and offers workbook conversion options in Excel2PDF.

Read the release page Read the release page
Solutions

Plug-Ins & Open Source

Cordova

Build native mobile (iOS, Android) apps with HTML, CSS & JS. Target multiple platforms with one code base on our mobile PDF SDK.

Learn More Learn More
Kotlin

Develop Android applications using MobilePDF SDK in Kotlin. Designed to work using Java, MobilePDF SDK can easily be integrated into your development process when working with Kotlin.

Learn More Learn More
React Native

Write with or create components using JavaScript code to develop Android and iOS applications using React Native.

Learn More Learn More
Xamarin

Build and deploy native Android, iOS and Windows apps, using existing skills, teams, and code in C# with MobilePDF SDK.

Learn More Learn More

WebPDF.JS

Develop a full-fledged PDF Viewer for browser environments, all with Javascript. Migrate from PDF.js and experience native-like performance.

Read more Read more
Explore further

Recent articles & project samples

Programmatically convert HTML to PDF

Updated 16 May 2022
Foxit Quick PDF Library
Foxit Quick PDF Library does not support converting entire HTML documents to PDF, however, it is possible to use a limited set of HTML tags to draw content onto pages in PDF files using the HTML text functions such as DrawHTMLTex...
Keep reading Keep reading

Add links to a PDF programmatically

Updated 13 October 2023
Foxit Quick PDF Library
Adding links to PDF files is very straight forward. A link in a PDF is actually an annotation and is placed on top of the content that you wish to link. These hotspot links can be added using the following functions: AddLinkTo...
Keep reading Keep reading

Replace text in PDF

Updated 16 May 2022
Foxit Quick PDF Library
Currently it is only possible to replace simple text that has not been encoded using Foxit Quick PDF Library using the scripting feature which uses Foxit Quick PDF Library behind the scenes. The function that lets you replace text...
Keep reading Keep reading

Check to see if PDF is compressed

Updated 16 May 2022
Foxit Quick PDF Library
There isn't an easy way to check if a PDF contains compressed elements or not. There is not a PDF wide compression option, instead various different objects and streams in PDF files can be compressed individually, using different ...
Keep reading Keep reading

Digital signature not visible on page after signing PDF

Updated 16 May 2022
Foxit Quick PDF Library
When you use the SignFile function to add a digital signature to a PDF it adds an invisible digital signature which is not shown on any of the pages in the document. Instead the digital signature can be viewed by opening the PDF i...
Keep reading Keep reading

Advanced options for signing PDF files

Updated 16 May 2022
Foxit Quick PDF Library
The SignFile function in Foxit Quick PDF Library lets you sign PDF files using the PKCS#12 format (containing a certificate and private key). But sometimes more advanced signing options are required. This is why we've added t...
Keep reading Keep reading

Adobe Reader or Acrobat displays a “At least one signature has problems” message when signed PDF is opened

Updated 13 October 2023
Foxit Quick PDF Library
After signing a PDF file and then opening it in Adobe Reader or Adobe Acrobat the following message may be shown just below the toolbar: This message does not indicate that the digital signature is invalid or corrupt. Inste...
Keep reading Keep reading

Why do Adobe Reader and Adobe Acrobat ask me to save changes after I open a PDF?

Updated 16 May 2022
Foxit Quick PDF Library
There are two main reasons Adobe Reader and Adobe Acrobat will prompt you to save changes to a file after opening it. The PDF was in some way corrupt and Adobe Reader / Adobe Acrobat automatically repaired it without showing you ...
Keep reading Keep reading

Programmatically extract form field data from PDF files

Updated 16 May 2022
Foxit Quick PDF Library
As well as enabling you to generate form fields and fill form fields, Foxit Quick PDF Library makes it easy to extract form field data or information about form fields from PDF files. In the sample code below we demonstrate how to...
Keep reading Keep reading