Jotdown is an open-source Android document manager and PDF reader that works offline. It provides OCR, text extraction, sticky notes, vector drawings, academic citation generation, Markdown/TXT/PDF export, local organization, and backup tools for researchers and students.
Jotdown is a PDF editors & office suites project. Reading, annotating, organizing, and citing academic PDFs without cloud accounts or internet access. It is built as an open-source project for researchers, students, and academics. The project is open source (GPL-3.0). It runs on the web and Android.
It is developed by Walter Ferreira Rebouças (Brazil), and it first shipped in 2026. The project is developed in the open on GitHub with 63 commits in the last 90 days. Key capabilities include PDF Reader, Text Extraction, and OCR. The interface is available in 26 languages, including Arabic, Tibetan, and Catalan.
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