Does PDF text always appear normal in the PDF viewer?

The reason why the chosen answer is correct lies in understanding how PDF viewers handle text rendering. PDF documents use a system that maps character codes to Unicode. This means that the viewer interprets the text based on these mappings, which can sometimes lead to inconsistencies in how the text appears. If the character codes do not align perfectly with the associated glyphs in the font being used, the viewer may render the text incorrectly or display it using the wrong characters.

In addition, factors such as font availability or encoding issues can lead to discrepancies. This explains why a simple yes or no response fails to capture the nuances involved in displaying text within PDFs, particularly across different viewers and setups.

Contextually, while properly encoded PDF files generally present text in a manner that is more likely to be accurate, there still exists the potential for issues, especially if the viewer does not have the necessary font or if the text was poorly encoded in the source document itself. The choice that text may not always appear normal highlights the complexities of PDF rendering in various environments.