OCRmyPDF adds an optical character recognition (OCR) text layer to scanned PDF files, allowing them to be searched.

PDF is the best format for storing and exchanging scanned documents. Unfortunately, PDFs can be difficult to modify. OCRmyPDF makes it easy to apply image processing and OCR to existing PDFs.

OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched

pdfsandwich generates "sandwich" OCR pdf files, i.e. pdf files which contain only images (no text) will be processed by optical character recognition (OCR) and the text will be added to each page invisibly "behind" the images.