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Using Adobe OCR

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Using the commenting and text annotation tools depends on your PDF being text-enabled. Not all PDFs are, and if the document was created through a scanner, it is certainly not text-enabled. Fortunately, Acrobat is able to convert 'flat' documents in to editable ones through a process called OCR - Optical Character Recognition. Follow the steps below to learn how to use OCR on a document.

1. To run OCR on a PDF, open in Acrobat X and expand the Tools pane. Choose Recognize Text and then either 'In This File' to convert one, or 'In Multiple Files' to convert documents in bulk.
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2. In the window that opens, confirm that the settings are the way you like (the defaults are English, Searchable Image, 600dpi), or change them by opening the Edit menu.
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3. Click OK and OCR will run. You will not have to save or reopen your document for this to take effect; once the wizard process your document, you will be able to perform whatever text-enabled functions you wish.
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