https://getpdfengineer.com PDF Engineer is a desktop PDF markup tool built for mechanical drawings and shop-document workflows. Open a PDF drawing, add clear visual annotations, and export a finished PDF without needing a full CAD system. The app is designed for practical review and redline work. You can mark up drawings with text, arrows, shapes, freehand sketching, dimensions, numbered callouts, GD&T feature control frames, and more. When you want to keep working later, save your markup state as a PDF Engineer project file and reopen it without losing your annotations. PDF Engineer also makes it easier to work across larger drawing sets. You can open PDF files, add pages from other PDFs, rearrange pages, and browse page thumbnails while you edit. Keyboard shortcuts, zoom controls, and quick save/export actions help keep the workflow fast for day-to-day engineering use. This app is a good fit for engineers, drafters, fabrication teams, inspectors, and reviewers who need a focused Windows tool for marking up PDF drawings.