Right PDF Editor/ Gaaiho Doc could not perform OCR on this page because it contains renderable text

When you start the Recognize Text Using OCR command,

Right PDF Editor returns the following error: "Right PDF Editor could not perform OCR on this page because it contains renderable text."

or

Gaaiho Doc returns the following error: "Gaaiho Doc could not perform recognition (OCR) on this page because: This page contains renderable text."

Description

Your PDF file may already contains editable text. Renderable text is editable text that exists within the PDF file. Right PDF/ Gaaiho cannot perform OCR on a document that contains renderable text.

Solution

Solution 1: Obtain a version of the document that does not contain renderable (editable) text or delete the rederable contents.

This message appears if the PDF document already contains editable text. Obtain a copy of the document that does not contain editable text or delete them.

Solution 2: Convert the PDF to image file and back to PDF, and then rerun OCR.

1. Convert the PDF document to an image file:
   Using Right PDF Editor/ Gaaiho Doc:
   Open the PDF file with Right PDF Editor/ Gaaiho Doc, select "File" > "Export", choose an image type (eg. JPEG, JPEG PNG, TIFF), and "Save as";
   or
   Open the PDF file with Right PDF Editor/ Gaaiho Doc, select "File" > "Print", choose "Right PDF/ Gaaiho PDF" printer, check "Print as image" at the bottom of the window, and "OK". 
   
   Using Right PDF Converter/ Gaaiho PDF Converter:
   Open Right PDF/ Gaaiho PDF Converter, select "Convert from PDF" > "Image", choose an image type (eg. JPEG, JPEG PNG, TIFF), and "Start converting".
   
   
2. Converting image back to PDF file:
   Using Right PDF Editor/ Gaaiho Doc:
   Open an image file directly with Right PDF Editor/ Gaaiho Doc.
   
   Using Right PDF Converter/ Gaaiho PDF Converter:
   Open Right PDF Converter/ Gaaiho PDF Converter, select "Convert to PDF", import the image file, and click "Start Conversion". 
   
3. Run OCR again on the image PDF file created.