This user manual is for Tesseract versions 4.x.x and 5.0.0.x. For versions 3.05.02 and older, see the documentation for old versions.
Tesseract is an open source text recognition (OCR) Engine, available under the Apache 2.0 license..
- The current official release is 4.1.1.
- The master branch on Github can be used by those who want the latest code for LSTM (--oem 1) and legacy (--oem 0) Tesseract. The master branch is using 5.0.0 versioning because code modernization caused API compatibility issues with 4.x release.
- The 3.05 branch on GitHub can be used by those who want the bug fixes for 3.05.02 release for legacy Tesseract.
Tesseract can be used directly via command line, or (for programmers) using an API to extract printed text from images. It supports a wide variety of languages. Tesseract doesn't have a built-in GUI, but there are several available from the 3rdParty page.
Tesseract can be used in your own project, under the terms of the Apache License 2.0. It has a fully featured API, and can be compiled for a variety of targets including Android and the iPhone. See the 3rdParty page for a sample of what has been done with it.
If you have a question, first read the documentation, particularly the FAQ to see if your problem is addressed there. If not, search the Issues List, Tesseract user forum and Tesseract developer forum, and if you still can't find what you need, please ask a question in Tesseract user forum Google group.
Also, Tesseract is free software, so if you want to pitch in and help, please do! If you find a bug and fix it yourself, the best thing to do is to attach the patch to your bug report in the Issues List.
- Release Planning
- API/ABI changes review for Tesseract
- Downloads
- Releases
- Release Notes
- Changelog
- 4.0x-Changelog
Tesseract 4.0x+ added a new OCR engine based on LSTM neural networks. It initially works (well) on x86/Linux with official Language Model data available for 100+ languages and 35+ scripts. For detailed information about the different types of models, see Data Files.
Model files for version 4.00 are available from tessdata tagged 4.00. It has models from November 2016. The individual language file links are available from the following link.
Model files for version 4.0.0 and later are available from tessdata tagged 4.0.0. It has legacy models from September 2017 that have been updated with Integer versions of tessdata_best LSTM models. This set of traineddata files has support for both the legacy recognizer with --oem 0 and for LSTM models with --oem 1. These models are available from the following Github repo.
Two more sets of official traineddata, trained at Google, are made available in the following Github repos. These do not have the legacy models and only have LSTM models usable with --oem 1.
Tesseract 5.0.0.x source code is available in the 'master' branch of the repository. The master branch is using 5.0.0 versioning because code modernization caused API incompatibility with 4.x release.
Binaries are available from:
Language model traineddata files same as listed above for version 4.0.0 can be used with Tesseract 5.0.0.x. These are available from:
- Tips to Improve Recognition
- Command Line Usage
- API Example - user_patterns
- API Example
- User App Example
- Viewer Debugging
- Common Errors and Resolutions
- Frequently Asked Qustions
- Historical Technical Documentation
- API/ABI changes review for Tesseract
- Manual Pages
- Source Documentation generated by Doxygen
- Neural Nets in Tesseract 4.00
- VGSL Specs
- VGSL Specs info from Tensorflow
- Network spec for tessdata_fast models
- Network spec for tessdata_best models
- DAS 2016 tutorial slides Slides #2, #6, #7 have information about LSTM integration in Tesseract 4.0x.
- 4.0 Accuracy and Performance
- Tesseract OpenCL - Experimental