What activity should be utilized to extract all the text from a PDF file?

To extract all the text from a PDF file, utilizing the activity that reads the PDF with OCR (Optical Character Recognition) is particularly effective when the PDF contains scanned images or is in a format where the text is not directly accessible. OCR technology recognizes the characters in an image and converts them into editable text, which is essential for scenarios where the text is embedded in a non-selectable format, such as in scanned documents.

While other methods may also aim to extract text, they are typically suited for different situations. For instance, directly reading a PDF file assumes that the text within it is selectable and encoded properly, which may not be the case for image-based files. The approach focusing on OCR ensures that even if the text is not readily selectable, it can still be accurately captured and converted into a usable format. This makes it a versatile choice, especially when dealing with varied types of PDFs that include both textual and graphical content.