A lightweight, fast, and feature-rich standalone PDF reader application built entirely in C# (Windows Forms) using the high-performance pdfium rendering engine.

• Blazing Fast Performance: Powered by the native PDFium library, rendering pages instantaneously and managing resources efficiently through robust memory recovery techniques.
• Dark Mode Support: Enjoy a stylish, easy-to-read dark UI with correctly preserved document and image colors—everything outside the document gets inverted to dark mode gracefully.
• Smart Zooming: Zoom in and out of your PDF accurately. Resizing the application or maximizing it automatically centers your document to optimally fit the window without losing your view tracking.
• Continuous Navigation: Seamlessly browse documents using the scroll wheel. Hit the absolute bottom or top of a page? Keep scrolling to automatically jump precisely to the next or previous page.
• Arrow Key Support: Navigate quickly and manually using the Up and Down arrow keys to scroll, and the Left and Right arrow keys to jump between pages.
• Password Protection: Full support for opening encrypted and password-protected PDFs. You are safely given 3 attempts to input the correct password before the file tab aborts.
• Tabbed Interface: Easily juggle multiple different PDFs using sleek top navigation tabs.

The repository has been neatly organized for source control and everyday development:

• src/ - Contains the core application logic (MinimalPdfReader.cs).
• assets/ - Contains the application resources like your generated sleek Red Generic PDF logo icon (app_icon.ico) and the script to recreate it.
• bin/ - The destination directory where the application is built securely. Your required .dll's such as pdfium.dll also live here.
• tests/ - A place to stash experimental or debug files (such as test_tabs.cs).
• legacy_python/ - Contains the older iteration of the PDF reader written in Python using pypdfium libraries, safely archived.

If you make modifications to src/MinimalPdfReader.cs, you can easily re-compile the C# application into an executable using the provided batch script. No massive Visual Studio installations required; it leverages the built-in Microsoft .NET Framework compiler.

Just run the following command in the root folder:

build.bat

Upon success, MinimalPdfReader.exe will be safely written into the bin/ folder wrapped up with its .ico icon logo.

To launch your compiled PDF reader, you can simply run:

run.bat

This will automatically target the executable living in your bin/ directory and launch the app in a new window!