Paperoo is a web application designed for editing PDF documents directly within a web browser. Its primary function is to provide a comprehensive set of tools for opening, modifying, exporting, and printing PDF files. A defining technical characteristic of Paperoo is that all file processing occurs locally on the user's machine: the document data never leaves the device. This approach emphasizes user privacy and data security. The application includes a range of editing capabilities. Users can add and modify text, insert images, and use drawing tools for annotations. It supports the creation of digital signatures and offers Optical Character Recognition (OCR) to extract text from scanned documents. Page management tools allow for reordering, rotating, deleting, or adding pages. The interface supports standard keyboard shortcuts, such as Command+Z for undo and Command+O for opening files. Typical use cases for Paperoo include filling out interactive forms, annotating PDFs for review, signing documents digitally, and combining or splitting files. The workflow generally involves uploading a PDF, applying the desired edits using the toolbar, and then exporting the final document. As a browser-based tool, it is accessible across different operating systems without requiring a dedicated software installation. User support is available via email at support@paperoo.app.