Powerful Royalty Free OCR SDK for .NET. High performance, royalty-free C# .NET OCR recognition on Windows 32bit and 64bit. OCR SDK for .NET is an OCR library that allows developers to easily embed high-quality optical character recognition functionality in their products. OCR SDK for .NET is a 100% royalty-free SDK library for developers. As a result, our customers can enjoy the lowest total cost of ownership of a quality OCR system.