01
Check release details and requirements
Review the system requirements and latest release information on this page before downloading.
Download PDF Diff
PDF Diff by AEC DX Labs is a free drawing comparison tool for architects and engineers. Runs locally on Windows 64-bit — no cloud upload, no subscription, no GPU required.
100% offline · Windows 64-bit · CPU only · Free for personal and commercial use
System requirements
- Windows 64-bit
- 4GB RAM minimum
- CPU-optimized, no dedicated GPU required
- All file processing stays on your local machine
Distribution note
The download link and release details are on GitHub. Click the button above to go directly to the latest release.
How to download
From download to first review in four steps.
See the full process before committing to the download.
02
Download from GitHub
Click the GitHub button above to go to the releases page and download the latest Windows package.
03
Load your Before and After drawings
Select the original and revised PDFs directly from your local machine.
04
Review in Split and Diff modes
Use Split mode for side-by-side review and Diff mode for red/blue change highlighting.
Windows SmartScreen
Installation Note: Windows SmartScreen
Because PDF Diff is a free, independently developed app without a commercial certificate, Windows will display a "Windows protected your PC" warning.
To run the app: Click More info, then click Run anyway.
Alternatively, right-click the downloaded file > Properties > check Unblock > click Apply.