Why can’t I highlight the text in my PDF document?

The Highlight tool won’t work in the following situations:

1. The document has restrictions allowing no comment on it. To check the document restrictions, navigate to File > Properties > Security.


2. The document doesn’t have searchable text, it is an image or scan-based. To check if the document has searchable text, navigate to View > Text Viewer to see if there is any text there. If no text appears, that indicates the document is a scan-based document. You can try one of the following ways:

1) Use the OCR (Optical Character Recognition) feature in Foxit PhantomPDF to make the text recognizable and highlightable.



2) Use the Area Highlight tool under Comment menu.



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