The World-Leading PDF SDK Library

Kdan PDF SDK is a universal mobile library for developers who want to render, manipulate and annotate PDF files in their iOS, Android, and Windows applications.


Developing with the #1 Mobile PDF Solution

Kdan PDF SDK extends your app's features with a set of professional PDF capabilities on smartphones and tablets.

Complete PDF API

We offer a variety of flexible kit plans. Developers can start with our demo version and select the plan that meets their needs.

Stable Viewer Engine

Kdan's PDF viewer engine has been perfected by 10 years of innovation and experience. We introduce regular updates to ensure the stablity of your apps.

Easy to Integrate

The PDF SDK easily integrates within your app using our SDK documentation and gives you more time to focus on designing your app.

Cross-Platform SDK

No matter what platform you integrate with, our PDF SDK helps developers build powerful apps that can view, edit, and annotate PDFs.

Unparalled Developer Experience

Create great apps regardless of your team's preferred language. Kdan PDF SDK works with mainstream programming languages, including Objective-C, Java, and C#.

Fully Customizable

Developers can design unique user experiences with fully customizable UI source code or use the default built-in Ul elements directly for your apps.

Evaluate our SDK today with all features included.

The Most Comprehensive PDF Features

Kdan's PDF SDK has all the functionality you need. Developers can leverage the power of PDF SDK advantages in your applications.


PDF Viewer

Kdan PDF SDK offers a powerful PDF viewing engine that can render large PDF documents in less time.


Text Search & Selection

The PDF library supports text search in PDF documents. The library enables text selection to copy words, phrases, and the paragraphs to your clipboard.


PDF Annotations

Highlight text, handwrite, add notes to PDFs, and more. Mark up PDF documents in your applications equipped with our annotation tools. Your annotations will be compatible with any PDF software.


PDF Forms

Complete both fillable and non-interactive forms. The PDF library lets users insert handwritten signatures directly into a form when working on invoices, contracts, tax declarations, and more.


PDF Signature

Whether you need to apply multiple signatures to PDFs or request a signature from your client, the PDF library accelerates your daily tasks by giving your applications the power to sign PDFs effortlessly.


PDF Conversion

Convert various file formats to PDFs, or convert your PDFs into Microsoft Word, Excel, PowerPoint, HTML, ePub, image files, and more.


Page Editor

Embed page editing tools in your applications to split, rotate, rearrange, extract, append, or remove PDF pages easily.



Watermark PDFs with customized text and images for document security. Different watermarks can be added to a single file, and every page can have multiple watermarks.

Try Kdan PDF SDK in your app today.

Seamless Integration with Kdan PDF SDK

Kdan PDF SDK is easy to integrate into your app, only requiring a few lines of code.System Requirements

Viewing a PDF
Creating an Annotation
NSString* pdfPath = [[NSBundle mainBundle] pathForResource:@"tiger" ofType:@"pdf"];

// (Auto Layout is fully supported as well)
// (Split View is fully supported as well, Only iPad, Turn Multitasking features on)

KMPDFViewController *pdfViewCtrl = [[KMPDFViewController alloc]
[self.navigationController pushViewController:pdfViewCtrl animated:YES];



Powered by Kdan PDF SDK

PDF Reader, Kdan Mobile's showcase app, is the best alternative to Adobe Acrobat on the market. Its source code is included in Kdan PDF SDK, helping you build amazing apps, faster.


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User Testimonials


“I have been using Kdan’s PDF series for a while and have loved them. Especially now with new features and Kdan Cloud package, I am glad that they are all in one! Very nice!”

- Val Sigler
IT Manager from the United States


“Awesome!! This is a great app! I have found it so helpful in highlighting passages, taking notes, and when using search to find something. I would recommend this app to anyone who needs to do more with their book, than just read it.”

- Capable0793
User Review from iTunes US store


“PDF Reader helps me greatly in my work environment. It is like my integral friend.

- Bishwombhar Lamsal
Evolved Entrepreneur from Nepal

Want to test Kdan PDF SDK out?

Contact our sales team for more information or request a free trial.