Jotdown is an open-source document manager and PDF reader built for researchers, students and academics. Reading, annotating and organizing your documents works fully offline; network is only used for optional DOI citation import and dictionary downloads. Focused on privacy — no account required, no data leaves the device beyond what those optional features need. Features: * PDF reader with text-layer extraction * OCR via open-source PdfBox * Sticky note annotations and vector drawings (stylus + palm rejection) * Academic citation (fichamento) generator * Export to Markdown (.md), TXT and PDF * ABNT citation format support * Local folder organisation system * Offline dictionary (Portuguese / English) * Backup and restore (local ZIP) * Dark mode support