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A fork of Tesseract Tools for Android (tesseract-android-tools) that adds some additional functions. Tesseract Tools for Android is a set of Android APIs and build files for the Tesseract OCR and Leptonica image processing libraries.

This project works with:

  • Tesseract 3.05
  • Leptonica 1.74.1
  • libjpeg 9b
  • libpng 1.6.25

The source code for these dependencies is included within the tess-two/jni folder.

The tess-two module contains tools for compiling the Tesseract and Leptonica libraries for use on the Android platform. It provides a Java API for accessing natively-compiled Tesseract and Leptonica APIs.

The eyes-two module contains additional image processing code copied from the eyes-free project. It includes native functions for text detection, blur detection, optical flow detection, and thresholding. Eyes-two is not needed for using the Tesseract or Leptonica APIs.

The tess-two-test module contains instrumented unit tests for tess-two.


  • Android 2.3 or higher
  • A v3.04 trained data file for a language. Data files must be copied to the Android device in a subdirectory named tessdata.


To use tess-two from your app, edit your app module's build.gradle file to add tess-two as an external dependency:

dependencies {
    implementation 'com.rmtheis:tess-two:9.0.0'

Javadoc is available.


If you want to modify the tess-two code, or you want to use the eyes-two module, you may build the project yourself locally. See BUILDING.md.


Release points are tagged with version numbers. A change to the major version number indicates an API change making that version incompatible with previous versions.

The change log shows what's new in each version.


If you've found an error in this project, please file an issue.

Patches are encouraged, and may be submitted by forking this project and submitting a pull request through GitHub.


Copyright 2011 Robert Theis

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

See Also

The Google Mobile Vision API team has made available an OCR capability that is provided to developers through the Google Play Services library: The Mobile Vision API offers a simple API for OCR that currently works for Latin-based characters.