Feature Graphic

MJ PDF

MJ PDF is a fast, minimalist, powerful and totally free PDF viewer made by Mudlej.

MJ PDF Features

Fast, simple, and very lightweight. (5.1 MB in Play Store)
Open source with total privacy.
Remembers the last page that was opened in each document.
Dark mode for the PDF.
Very fast and powerful search in the PDF.
Full-screen mode with buttons to:
- Rotate the screen.
- Brightness control bar.
- Auto scroll with adjustable speed.
- Lock horizontal swipe.
- Take a screenshot.
Text Mode to view the PDF a text.
A page to see the full Table of Content
A page to see all the Links embedded in the PDF.
Open online PDFs through links.
Share & print PDFs.
Open multiple instance of the app at the same time.

Screenshots

Light Mode	Dark Mode	Main Menu

Github Page

The codebase is hosted on Gitlab. But I opened a page in Github for issues like requests, bug reports... Github page link.

Permissions and privacy

This app does not collect any data. The following permissions are required to provide specific features in the app:

Internet: For opening PDFs through links
Storage: For saving downloading PDFs and opening them from storage

MJ PDF V2.0.0 Release Notes

Rebranded the app as MJ PDF with a new original icon.
Search has become blazingly fast.
Added the ability to filter search results by another query.
Search results are expandable if you want to see more context.
The chosen search result will be highlighted in the PDF.
Added support for Hyperlinks.
Added a Table of Content page.
Added auto scrolling. (adjustable speed, both direction).
Added a button to lock horizontal scrolling.
Added a button to take a screenshot.
Added a second top bar with seven shortcuts. (hidden by default)
Added a page to see a list of all the links embedded in the file.
Added Text Mode to view the PDF as text.
- You can change the size of text in Text Mode.
- You can change the color of the text and background in Text Mode.
- All preferences (size, color..) and the last opened page will be saved automatically.
- Clicking on the page number in Text Mode shows a 'Go To Page' popup.
Added icons to all menu items in all pages.
Clicking on the scroll handle shows the 'Go To Page' popup.
Prevent accidental back pressing by required double press to exit.
Decreased app's size by 27.5%. It became 5.1 Megabytes.
Fixed not remembering the last visited page sometimes.
Fixed hiding the Buttons and Scroll Handle while the user is still interacting with them.
Fixed not being able to reset the zoom to a page-width level by double tapping
Fixed few common crashes.
Fixed not stopping auto scrolling when the user exit the Full Screen Mode.

What is different from PDF Viewer Plus

After the launch of MJ PDF, Gokul Swaminathan discontinued PDF Viewer Plus app. And he suggested MJ PDF as a replacement. MJ PDF V2.0 codebase is 400% larger than PDF Viewer Plus without counting the libraries forked for MJ PDF, while being a quarter of its size. See changelog

Underlying Libraries

I Forked PdfiumAndroid to update its core libraries that were years behind and had too many security vulnerabilities. And Forked AndroidPdfViewer to add features (like extracting PDF text) and modify some of its behavior (like scroll handle).

Updated PDFium to 112.0.5579.0 (in v2.0.2) (source code, building script)
Updated libpng to 1.6.39 (source code, building script)
Updated Freetype to 2.13.0 (source code, building script)

Authors and acknowledgment

MJ PDF is made by Mudlej.
The original app (PDF View Plus) was made by Gokul Swaminathan (@JavaCafe01).
@barteksc, made the libraries that MJ PDF uses to render PDFs.
Credits to (@Derekelkins)'s pull request on Pdf Viewer Plus for adding the ability to remember last opened page.
Big thanks to Bnyro (LibreTube's dev) for helping me with the colors and how to migrate to M3. (MJ PDF v2.1)

License

MJ PDF uses the GPLv3 license, the original app (PDF View Plus) was under MIT license

mudlej / mj_pdf

readme