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This package contains an OCR engine - libtesseract and a command line program - tesseract.

I searched the web for a free command line tool to OCR PDF files: I found many, but none of them were really satisfying:

PyMuPDF is a high performance Python library for data extraction, analysis, conversion & manipulation of PDF (and other) documents.

js is a javascript library that gets words in almost any language out of images. (Demo)

A Chrome and Firefox extension for reading a paginated document trapped in a viewer — a scanned book, a slide deck, a PDF, a reader that won't let you select text.