Free Tool
Drawing Overlay & Compare
Compare two PDF drawing revisions visually — overlay blend, pixel difference, side-by-side sync, and flicker modes. Everything runs in your browser.
About this tool
Upload two PDF drawing revisions and instantly spot every change — new walls, moved dimensions, removed annotations. Four comparison modes let you choose the clearest way to review. Supports multi-page PDFs with per-page navigation.
Key features
- Overlay blend — adjustable opacity between revisions
- Difference — removed in red, added in blue
- Side-by-side — synchronised pan and zoom
- Flicker — rapid alternation to spot changes by eye
- Export comparison as PNG
- Multi-page PDF support — no file upload required
Need revision tracking, change alerts, and team annotations?
Setubase links your drawing revisions to RFIs, transmittals and site inspections.