PDF OCR is a simple drag-and-drop utility that converts PDFs and images into text documents. It uses advanced OCR (optical character recognition) technology to extract the text of the PDF or image. This is particularly useful for dealing with PDFs and images that were created via a scan-to-PDF function in a scanner or photo copier. It uses the Tesseract engine to perform OCR, and currently supports over 20 languages for OCR.
Aspose.OCR for .NET is a character recognition component built to allow developers to add OCR functionality in their ASP .NET Web applications, Web services, and applications. It provides a simple set of classes for controlling character recognition tasks and supports BMP and TIFF.