LEADTOOLS provides fast and accurate Optical Character Recognition SDK technology for C/C++, C# and VB.NET developers. Leverage LEADTOOLS' high level OCR toolkit to rapidly develop robust, high-performance recognition applications which incorporate features and benefits such as extracting text from scanned documents, saving time and money over manual data entry, and converting images to text-searchable formats such as PDF, PDF/A, XPS and Microsoft Word.
With LEADTOOLS' extensive support for over thirty character sets, programmers can expand their customer base by providing the same solution for Latin, Cyrillic, East Asian and Arabic languages.
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Watch a video for the LEADTOOLS OCR Interface features

Overview of LEADTOOLS OCR SDK Technology
- OCR is available as C DLL, .NET classes, Web Services and WF activities
- Multithreaded support for running OCR in high performance, server-based applications hosted in Windows services, Web services and Windows WF hosted applications
- 32 and 64 bit OCR binaries
- Broad OCR language character set support including East Asian and Arabic
- Full page and zonal OCR
- Options to disable font characteristics recognition for faster plain text recognition
- OCR integrates seamlessly with Forms Recognition and Processing SDK technology
- Built-in and custom spelling dictionaries to improve OCR results
- Manually or automatically (using LEAD's AutoZone technology) segment source images into text, image and table OCR zones
- Save OCR output to memory or any of over 40 formats including text searchable PDF, PDF/A, Word and XML
- Multiple interchangeable OCR engines
- Powerful document image cleanup and preprocessing functions to improve OCR results of scanned images
TIFF to Searchable PDF in Three Lines of Code
The LEADTOOLS OCR SDK provides a high level programming interface which allows developers to create complex recognition applications in record time. For example, with the AutoRecognizeManager, developers can convert any of 150+ image formats into a text-searchable format such as PDF or DOC in as little as three lines of code!

Other LEADTOOLS SDK Technologies Related to OCR
LEADTOOLS SDK Products that Include OCR SDK Technology
OCR Product Comparison Chart
Hover over each product for a description. Click for more details.
The LEADTOOLS Recognition Imaging SDK is a handpicked collection of LEADTOOLS SDK features designed to build end-to-end document imaging applications as part of an enterprise level document automation solution that requires scanning, OCR, OMR, forms recognition and processing, archival, annotation and display functionality. This powerful set of tools utilizes LEAD's industry LEADing image processing technology to intelligently identify document features that can be used to recognize any type of scanned or faxed form image.
The LEADTOOLS Document Imaging Suite SDK is a comprehensive collection of LEADTOOLS SDK features designed to build end-to-end document imaging applications within enterprise level document automation solutions that requires capture, OCR, OMR, forms recognition and processing, PDF, print capture, archival, annotation and display functionality. This powerful set of tools utilizes LEAD's industry LEADing image processing technology to intelligently identify document features that can be used to recognize any type of scanned or faxed form image.
The LEADTOOLS Advantage OCR Module adds methods for incorporating optical character recognition (OCR), intelligent character recognition (ICR) and magnetic ink character recognition (MICR) technology into applications and includes everything needed to develop robust, high performance and scalable image recognition solutions. The LEADTOOLS Advantage OCR Module seamlessly integrates with LEADTOOLS SDKs in the Document and Medical product lines.
The LEADTOOLS Plus OCR Module adds methods for incorporating optical character recognition (OCR) technology into applications and includes everything needed to develop robust, high performance and scalable image recognition solutions. The LEADTOOLS Plus OCR Module seamlessly integrates with LEADTOOLS SDKs in the Document and Medical product lines.
The LEADTOOLS Professional OCR Module adds methods for incorporating optical character Recognition (OCR) technology into applications and includes everything needed to develop robust, high performance and scalable image Recognition solutions. The LEADTOOLS Professional OCR Module seamlessly integrates with LEADTOOLS SDKs in the Document and Medical product lines and is the fastest of the LEADTOOLS OCR SDK modules.
The LEADTOOLS Arabic OCR Module adds methods for incorporating optical character recognition (OCR) technology into applications and includes everything needed to develop robust, high performance and scalable image recognition solutions. The LEADTOOLS Arabic OCR Module seamlessly integrates with LEADTOOLS SDKs in the Document and Medical lines.
The LEADTOOLS Asian OCR Module adds methods for incorporating optical character recognition (OCR) technology into applications and includes everything needed to develop robust, high performance and scalable image recognition solutions. The LEADTOOLS Asian OCR Module seamlessly integrates with LEADTOOLS SDKs in the Document and Medical lines. Supported languages include Chinese, Japanese and Korean.
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