Copy the text and paste it into a plain text editor
Select all and change the font color or background color
Highlight the covered area and inspect it with accessibility or OCR tools
Open the file in a different app or browser
Zoom in or change the page layout
Turn off dark mode or custom themes
Use keyboard navigation to move through hidden text
View the page source or document properties
Check for text behind images or shapes by changing layer order
Use search to find the hidden words or phrases