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Anyone knows a PDF OCR tool? I am using a free online one. I take pictures with opennotescanner which spits out a PDF which I want searchable.

Tesseracts expects PNG and outputs to text. I want the same PDF to be hidden overlaid with OCR text.

This free PDF online service does a decent job but offline would be better.

It comes with an API, so you can integrate it with your workflow.

I tried that. Their free api is too little of use. 1MB file.

I use PDF24.org which actually does everything great.

Anything offline?

Free & offline: Tesseract + pdfsandwich, see http://www.tobias-elze.de/pdfsandwich/