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The Opait TessPro is a Windows 64-bit program designed to automate and optimize the use of the Tesseract OCR engine in production environments. The operation of the processing engine can further be controlled or enhanced using a simple callback-based plugin interface. This document describes the plugin interface, as well as, other available API in order to customize the operation of the program to fit specific requirements.


Opait TessPro was built using a number of open source components. The use of these components and their respective licenses are acknowledged below.

Tesseract © Copyright 2014, Google Inc. Licensed under the Apache License, Version 2.0

Leptonica by Dan Bloomberg is licensed under a Creative Commons Attribution 3.0 United States License. © Copyright 2001-2018, Leptonica.

Pdfium © Copyright 2014 PDFium Authors. All rights reserved.

Tesseract.Net © Copyright 2012-2016 Charles Weld. Licensed under the Apache License, Version 2.0