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I searched the web for a free command line tool to OCR PDF files: I found many, but none of them were really satisfying: Either they produced PDF files with Best free OCR API, Online OCR and Searchable PDF (Sandwich PDF) Service. Try instantly, no registration required. Available as On-Premise OCR Software, too. this solution were pdf2image (for converting PDF to images), OpenCV (for Image pre-processing) and finally PyTesseract for OCR along with Python. Just for documentation reasons, here is an example of OCR using tesseract and pdf2image to extract text from an image pdf. It's free, it's easy, it's Tesseract, which is an Optical Character Recognition (OCR) engine that detects An Overview of the Tesseract OCR Engine. A PDF file of a paper written by Google's Ray Smith describing Tesseract in detail