Pdf4Edit is a PDF toolkit for phone and computer. On mobile: scan, take notes, mark up, and edit quickly. On the web: the full editor — annotations, forms, stamps, drawings, and editable PDF4 projects. Pair once, then send files phone ↔ PC over the same Wi‑Fi — fast, in-app, AirDrop-style. Your files stay on your devices. Many customised tools such us rulers, shapes for students, teachers, engineers, marketing and finance