While the normal OCR programs contain within them all the necessary JOCR follows a different path: it supports a particular feature of Microsoft Office (which must be installed on our computers), namely Microsoft Office Document Imaging (installed automatically, if for example we have Office 2003).
This means that JOCR is lightweight (less than 100kb), and that in practice only works from ‘pilot’ to check the tool from Microsoft. The recognition quality is good (very good, actually), but JOCR is unable to upload images (or PDF), but only to take and recognize what is displayed on the screen.
Given the lower resolution computer screen compared to the scanned text with the scanner, you may have problems (a worst character recognition) with small, but in any case usually the recognition by JOCR is-as mentioned before-on good levels.
I’ve had for some time the question of whether to report on hitfreeware, because even if JOCR is free, requires MS Office (which is not free), I finally decided to report it anyway, because maybe many have already installed MS Office (and for everyone else, there’s always FreeOCR).