Adding text places new, readable text onto a PDF page — useful for labels, notes, and filling visible blanks. You click where the text goes, style it, and export, without changing the content underneath. It runs in your browser.
Yes, as a visible overlay. The tool places new PDF text; it does not recognize scanned text.
Yes. Style controls let you set size, color, and placement before export.
Yes, where supported the export writes real PDF text that readers can select.