A Word document can look different depending on the fonts installed, the software version, or the operating system opening it. Converting to PDF locks the layout in place — what you see is exactly what the recipient sees, on any device, which is why PDF is the standard format for resumes, invoices, contracts, and official submissions.
This tool requires the site's backend conversion service (see technical notes for site owner). It performs true server-side conversion rather than a client-side approximation, which is what makes the output reliable.