01
Check requirements
Review the system requirements on this page. Windows 64-bit and 4GB RAM minimum.
Get REVIFF on Microsoft Store
REVIFF (formerly PDF Diff by AEC DX Labs) is a free drawing comparison tool for architects and engineers. Now available on Microsoft Store — 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
REVIFF is now on the Microsoft Store — no manual download or SmartScreen bypass needed. The tool was previously distributed as a portable .exe on GitHub (PDF Diff Beta v0.9.0).
How to get started
From Microsoft Store to first review in four steps.
See the full process before you open the Store.
02
Install from Microsoft Store
Click the Microsoft Store button above. The Store handles installation — no manual setup or SmartScreen bypass needed.
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.