Question

Is it possible to add only recognized text to the PDF file without changing the image?

Answer

To add only a text layer to a document and exclude the preprocessing of its image, recognize a document in the PDF Editor and save it as described below: 

1. On the New Task screen, click the Open tab > click Open PDF Document > select your document;
2. In the PDF Editor click the Recognize button on the toolbar > Recognize Document... or press Ctrl+Shift+R;
   
   
3. Specify the OCR languages of your document;
   
   If needed, here you can also enable some options of image preprocessing, such as Correct page orientation and Deskew images and correct image resolution. 
   
4. Click Recognize button;
5. After a text layer has been added, save the document by clicking button or Save As > PDF Document (Ctrl+Schift+S):
   
   

You will get a searchable PDF, in which you can search, select, and copy text.