The easiest and lowest cost way to add TWAIN document scanning capabilities to your web based applications.

Supports Windows and macOS client operating systems.


Your Document Scanning Toolkit


Developed by Knowledgeone Corporation, the WebTWAIN SDK is a software development toolkit that provides document scanning, image processing and OCR capabiities.


This is the same functionality used by Knowledgeone Corporation in its standard RecFind 6 products and used by thousands of users all over the world, every day. It is stable, robust and proven in the real world.


The WebTWAIN SDK is a browser-based document scanning toolset specifically designed for web applications running on Microsoft Windows and iMac macOS workstations.


Using JavaScript, you can add TWAIN document scanning capabilities to any application. The SDK makes it easy to scan, edit and capture/upload scanned images in multiple formats.

Scanner Support

  • TWAIN specification 2.1 and below compatible
  • Supports Auto Document Feeder (ADF) and multiple image acquisition
  • Supports duplex scanning
  • Built-in wizard mode intelligently manages TWAIN states

Output formats

  • Saves and uploads images as BMP, JPEG, PNG, TIFF, PDF and PDF/A
  • Inbuilt OCR functionality available for PDF and PDF/A

Web Browser Support

All major popular web browsers are supported, including:

  • Microsoft Internet Explorer 11 or above
  • Microsoft Edge
  • Google Chrome
  • Mozilla Firefox
  • Safari

Developer friendly pricing and licencing

For a single one-time fee, use the WebTWAIN SDK for an unlimited number of users scanning an unlimited number of documents. All you need to purchase is a license per organisation.



Easily integrate with Angular, JavaScript, jQuery, VBScript, HTML5, HTML, etc. It’s compatible with any JavaScript framework (AngularJS, ReactJS, Node.js, Vue.js).

Easy Distribution

  • An installer with MSI deployment support is provided
  • JavaScript automatically detects if the scanning service is installed and will download the setup when necessary

Powerful Image Editing Features

  • Includes the ability for users to rotate, crop, mirror, flip and redact scanned pages
  • Supports image swapping

See it in action

We have made available a Beta demo site (developed in .NET Core) for the new version 2.2

A list of current issues is available at our GitHub site. Please report any new issues to support@webtwainsdk.com.

Sample Source Code

We have a GitHub Repository available showing you how easy it is to integrate to the WebTWAIN SDK. Go to GitHub now to see the code for the Demo Site.


There is a single upfront fee per developer and an optional annual maintenance agreement (after the initial twelve months). There are NO royalties or payments of any other kind.


The Web Twain Software Development Kit (SDK) comes with:

  • all the code you will need to add TWAIN scanner support to your application
  • a sample application demonstrating how to call the WebTWAIN SDK
  • twelve months of support from date of purchase, and
  • twelve months of updates from date of purchase

Unlike similar offerings, only the developer needs to be licensed. There are no restrictions on the distribution of solutions using the WebTWAIN SDK. There is no limitation or additional charges based on the number of installations, number of end users or the number of documents that are scanned. There are no royalties of any kind.


 Please Request a Quote to find out more.

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We are happy to discuss any questions you may have.