The OCR project support page offers additional details on preserving character formatting for things like bold and italics after OCR in the output text: Developed as a community project during 1995-2006 and later taken over by Google, Tesseract is considered one of the most accurate OCR engines and works for over 60 languages. Google's OCR is probably using dependencies of Tesseract, an OCR engine released as free software, or OCRopus, a free document analysis and optical character recognition (OCR) system that is primarily used in Google Books. The technology extracts text from images, scans of printed text, and even handwriting, which means text can be extracted from pretty much any old books, manuscripts, or images.
It's quite simple and easy to use, and can detect most languages with over 90% accuracy. Google's Optical Character Recognition (OCR) software now works for over 248 world languages (including all the major South Asian languages).
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