PDF Compare Viewer V2

Version 2.1.0 | Side-by-side PDF comparison with native annotation support

Features

• Side-by-side PDF comparison - Open multiple PDF windows for visual comparison
• Sync / Solo mode - Synchronized or independent viewing per window
• Per-window relative zoom - Fine-grained zoom control per PDF window
• Absolute zoom unification - Set a common zoom level from the footer
• Page rotation - Rotate pages with ↶ / ↷ buttons
• Native PDF annotations - Rectangle and ink annotations
• Annotation write-back - Adobe-compatible standard PDF annotation format
• Multi-screen aware - Auto-layout across current screen group
• Hand-pan mode - Pan PDFs freely (toggle via footer button or mouse middle button)
• Ctrl + mouse wheel - Fine-grained relative zoom

Quick Start

Run from source

# Requires Python 3.11+
py -3.11 starter/main.py

Or with virtual environment:

.venv/Scripts/python starter/main.py

Build from source

Windows (PowerShell):

./build_nuitka.ps1

Windows (Batch):

build_nuitka.bat

Project Structure

pdf_compare_viewer_v2_native_pdf_annotations/
├── starter/
│   ├── main.py          # Application entry point
│   └── requirements.txt # Python dependencies
├── build_nuitka.ps1     # Nuitka build script (PowerShell)
├── build_nuitka.bat     # Nuitka build script (Batch)
├── pdf_helpers.py       # PDF annotation helpers
├── types_constants.py   # Type definitions and constants
├── requirements.txt     # Runtime dependencies
└── README.md            # This file

Dependencies

• Python 3.11+
• PyMuPDF (fitz) - PDF rendering
• Nuitka - Python to EXE compilation

Known Limitations

• Annotation save format is standard PDF annotations for Adobe editing compatibility
• Initial PDF content top alignment may vary in some multi-window startup paths

License

MIT