If, for example, your PDF is in French, after you install the corresponding tesseract-ocr-fra, you will run: tesseract -l fra newfile.tiff output pdfĪnd the desired file will be, again, output.pdf. OCR also allows for archiving by keeping the look and feel of your documents and giving you the option to restrict editing capabilities and save them as searchable PDFs. The generated file will be named output.pdf. With OCR (Optical Character Recognition) technology, you can search and extract text in all of your PDFs, including those you created from paper documents. In a searchable PDF, text is recognized using Optical Character Recognition (OCR) and then embedded in the scanned original. In the particular case that your original PDF is in Portuguese, you will need this command: tesseract -l por newfile.tiff output pdf Also choose any desired output format, for example. If, as in the outdated post, you forget to add alpha -Off, you'll get the following error: Tesseract Open Source OCR Engine v4.0.0-beta.1 with LeptonicaĮrror in pixReadFromTiffStream: spp not in set Step 1 Upload images or PDFs Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page Step 2 Language & format Select all languages used in your document. Run: convert -density 125 originalfile.pdf -depth 8 -alpha Off newfile.tiff If you Google "tesseract PDF" you will probably find this somewhat outdated post. Please make sure the TESSDATA_PREFIX environment variable is set to your Otherwise you'll get the error: Error opening data file /usr/share/tesseract-ocr/4.00/tessdata/por.traineddata For example for Portuguese, you will need to do: sudo apt-get install tesseract-ocr-por If you are going to use a language other than English with tesseract, then you will have to install the corresponding laguage package. Sudo apt-get update & sudo apt-get upgradeĪpt-get install tesseract-ocr -print-uris Extracting embedded images from a PDFįirst, install tesseract-ocr with: apt-cache show tesseract-ocr.pdfsandwich: Alternative software wrapper I just discovered, that is worth checking out too!.What's the best, simplest OCR solution?.How to turn a pdf into a text searchable pdf?.The wrapper has no python dependencies, as it's currently written entirely in bash. You'll now have a pdf called mypdf_searchable.pdf, which contains searchable text!ĭone. # Make an entire directory of images into a single searchable PDF: Source code: Instructions to install & use pdf2searchablepdf: All intermediate temporary files are automatically deleted when the script completes. It uses pdftoppm to convert a PDF into a bunch of TIFF files, then it uses tesseract to perform OCR (Optical Character Recognition) on them and produce a searchable PDF as output. Give it a shot it works great! It is a simple wrapper around tesseract. The resulting PDF files are saved either in the source folder. I had this same problem so I wrote this over the weekend. Saving is performed according to the current destination settings.
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