TWAIN SDK Libraries

LEADTOOLS provides everything needed to control any TWAIN scanner, digital camera, or capture card and is an important component of many business workflows. With LEADTOOLS, .NET 6+, .NET Framework, C++ Class Library, C#, VB, C/C++, HTML / JavaScript, and Python developers can use TWAIN to capture images for OCR, barcode, forms recognition, image processing, annotation, and more. High-level acquisition functions are included for ease of use while low-level functionality is provided for flexibility and control in even the most demanding scanning applications.

Feature-rich TWAIN SDK

Flexible TWAIN Driver Interface

The LEADTOOLS TWAIN libraries can get and set all TWAIN capabilities supported by 32- and 64-bit TWAIN versions 1.x and 2.x device drivers. This facilitates the bypass of the driver's built-in user interface so you can build a custom interface that saves settings across sessions and is consistent when using different TWAIN devices to make your solution extremely user friendly. The libraries can completely bypass a user interface to create completely automated solutions to scan bitonal, halftone, grayscale, palettized, and full color simplex and duplex images from the flatbed or ADF.

Fast TWAIN Libraries

Build Screaming Fast TWAIN Solutions

The LEADTOOLS TWAIN libraries completely support running in multithreaded applications. When paired with per page callbacks, your solution can process a page while the next pages are being acquired. For even better performance, the LEADTOOLS Fast TWAIN component uses artificial intelligence to interrogate the TWAIN driver and set the scan settings for the absolutely fastest scanning speed the device can handle.

Web and cloud TWAIN Libraries

Web and Cloud Scanning

The source code of a complete web scanning framework is included in the LEADTOOLS installation. This programmer-friendly and modular web scanning architecture is perfect for creating new innovative web applications or to add web scanning to existing web applications, frameworks, and workflows such as SharePoint and CRM.

Versatile and robust TWAIN Libraries

TWAIN—A Gateway Feature

Capture images to be used for further processing such as:

TWAIN Development Made Easy

Easy to Integrate

LEADTOOLS handles the heavy lifting, eliminating months of R&D, while giving you the best quality and performance available. You'll be free to focus on other components of your application. Download the LEADTOOLS evaluation to streamline your development.

Cross platform libraries

TWAIN SDK Platforms and Programming Interfaces

Operating Systems

Projects that use LEADTOOLS TWAIN libraries can be deployed to Windows and Web devices.


Developers that are leveraging these frameworks can utilize the TWAIN SDK: .NET 6+, .NET Framework, WinForms, C++ Class Library, ASP.NET, and Web Services / Web API (JSON, SOAP, REST)

Programming, Scripting, Markup

TWAIN code snippets and demo applications are provided for the following: C#, VB, XAML, C/C++, HTML / JavaScript, and Python


TWAIN libraries as well as all LEADTOOLS Recognition, Document, Medical, Vector, and Imaging technologies for all development and target platforms, including Windows and Web.

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Online Demo Application that include TWAIN SDK Libraries

HTML5/JavaScript Web Scanning Interactive Demo

An interactive demonstration of LEADTOOLS web scanning technology.

  • Scan and upload images from devices in browser-based applications
  • Apply image processing functions to scanned images
  • Print scanned images

NOTE: Client required

  • Windows: A TWAIN device and to download a TWAIN proxy for Windows
  • Linux: A SANE device and to download SANE RPM package