MJ PDF – A fast, private, completely free, open‑source PDF reader
Why choose MJ PDF?
• Speed & smoothness – Lightning‑quick rendering that never lags.
• Zero ads, zero tracking – Your documents stay on your device, untouched by marketers.
• Open source – Licensed under GPL v3, the code is transparent and community‑driven.
Reading experience
• Dark mode for the app and for PDF pages.
• Edge‑to‑edge fullscreen with customizable shortcut buttons.
• Multiple layout options: horizontal, vertical, dual‑page, right‑to‑left.
• Auto‑scroll with adjustable speed; hide margins, lock zoom, rotate pages.
• Live search with instant results, table of contents, bookmarks, link navigation, and history.
• Text‑mode reflow with selectable fonts and themes.
• Support for password‑protected files and PDFs opened from the web.
• One‑tap sharing and printing.
Annotation tools
• Highlight text and attach notes.
• Hand‑draw signatures directly on the page.
• Fill out interactive PDF forms.
• Save all annotations back into the original file.
• Select text for copy, share, web search, translation, or dictionary lookup.
• Export highlighted quotes as images.
Library management
• View files by Recent, Library, or Folders.
• Search every PDF on the device in seconds.
• Rename, delete, share, or move files without leaving the app.
• Resume reading exactly where you left off.
• Organize PDFs into custom collections such as “To Read,” “Reading,” “Completed,” etc.
Privacy & permissions
• All reading activity remains on‑device; no telemetry is sent.
• Crash reports are optional, never include your PDFs, and are only sent with your explicit consent.
• Storage permission is used solely to locate, open, rename, delete, and manage PDF files on internal or removable storage.
• Internet access is required only to open PDFs from URLs and to transmit a user‑approved crash report.
Get involved
• Website: https://mudlej.com/projects/mj-pdf
• Source code: https://gitlab.com/mudlej_android/mj_pdf_reader
Choose MJ PDF today
• Experience a PDF reader that respects your time, your privacy, and your freedom.
FAQ
Q: How does MJ PDF keep my reading private?
A: The app never sends any telemetry or analytics; all reading activity stays on your device. The only optional data leave the phone are crash reports, which you must explicitly approve and which never include the contents of your PDFs.
Q: Is MJ PDF really free, and what does the GPL v3 license mean for me?
A: Yes, MJ PDF is completely free with no hidden costs or ads. The GPL v3 license lets you view, modify, and redistribute the source code, as long as any derivative work also remains open source under the same terms.
Q: Can I read PDFs in dark mode, and does it apply to the page content too?
A: Absolutely. MJ PDF offers a system‑wide dark theme for the app interface and an optional dark‑mode overlay for PDF pages, so you can read comfortably in low light without straining your eyes.
Version History
v3.1.0——10 Sep 2026
A simple and powerful open source PDF documents viewer. Download the latest version of MJ PDF - Fast PDF Viewer to enjoy new features and updates immediately!
*3.1.0
MJ PDF 3 is a major upgrade:
• New home screen with three tabs: Recent, Library and Folders
• Highlights, notes, handwritten signatures, and PDF forms
• Dual-page and right-to-left reading modes
• Rebuilt Text Mode with reflow, fonts, and themes
• User Bookmarks, browser-like history, and better links and search
• Customizable toolbar and fullscreen buttons
• Backup and restore for settings and reading history
• Major performance, privacy, stability, and new languages
*3.3.0
MJ PDF 3 is a major upgrade:
• New home screen with three tabs: Recent, Library and Folders
• Highlights, notes, handwritten signatures, and PDF forms
• Dual-page and right-to-left reading modes
• Rebuilt Text Mode with reflow, fonts, and themes
• User Bookmarks, browser-like history, and better links and search
• Customizable toolbar and fullscreen buttons
• Backup and restore for settings and reading history
• Major performance, privacy, stability, and new languages
*2.2.1
- Added support for Arabic, Chinese, Turkish, German, Spanish, Portuguese, Hindi, Russian.
- Search Enhancements: Back to results button; better highlighting.
- UI Fixes: Consistent icon colors, improved layout and visibility.
- Added Always Horizontal mode.
- Added Experimental 'Reload PDF' button.
- Better support for password-protected and non-local PDFs.
- Stability: Fixed crashes from background operations.
- Development: Upgraded SDK, Gradle, and dependencies.
