Large Print PDF conversion scales page coordinate boundaries (MediaBox) and vector typography by 125% to 200%, creating high-legibility document layouts that comply with American Printing House for the Blind (APH) and ADA visual accessibility guidelines. Unlike screen-only magnification, physical large-print scaling permanently re-engineers coordinate systems, allowing oversized high-contrast documents to be printed on standard A4, US Letter, or A3 ledger formats without font blur or pixelation. Designed for seniors, visually impaired readers, instructional classroom displays, and public signage.