What is a PDF?
PDF stands for Portable Document Format β a universal file type that displays documents exactly the same way on every device, operating system and application. Whether opened on a phone, tablet, Windows PC or Mac, a PDF preserves its fonts, images, layout and spacing perfectly. This reliability is why PDFs are the global standard for invoices, contracts, certificates and reports.
Modern web technologies like PDF-lib, jsPDF and PDF.js now let tools create and edit PDFs entirely inside the browser, which is exactly how PDF Toolkit Pro works β combining the universal reliability of PDF with complete privacy, since nothing is ever uploaded to a server.