Making searchable PDFs
Tesseract can directly convert an image of text into a PDF with a hidden layer of selectable / copy-pasteable text.
tesseract words.png out -l eng PDF
See: this very good guide
To make corrections to the OCR'd text, you can use tesseract to output using the HOCR format, make corrections (to the words ?!) and then use the "hocr2pdf" utility to put the pieces (image + corrected/positioned text) back together in PDF format.
pdfsandwich includes the hocr2pdf utility.
