Free Tool · PDF CAD overlay compare
PDF & CAD Overlay Compare
AHJ issued a PDF revision but you have the CAD source? Overlay the PDF under your DWG/DXF, tune opacity and offset, and spot missing devices or shifted geometry.
Parsed locally · not uploaded by default · no AutoCAD required
Free
Price
DWG / DXF
Formats
None
Install
Not required
AutoCAD
What this tool includes
Full PDF CAD overlay compare functionality search text, toggle layers, measure distances, and export labels. Built for AEC CAD review workflows worldwide.
- Open DWG/DXF
- Add PDF underlay
- Align & compare
Revision check without desktop CAD
Load the live CAD model, add the PDF sheet as a semi-transparent underlay, then pan/zoom the CAD view while aligning the PDF with scale and offset sliders. Ideal for catching PDF print errors vs model space.
How to use PDF CAD overlay compare
Three steps no training, no AutoCAD license, no IT install.
- 1
Open DWG/DXF
CAD geometry loads in viewer.
- 2
Add PDF underlay
Pick the issued PDF sheet.
- 3
Align & compare
Opacity, scale, X/Y offset controls.
Operation guide
How to Overlay PDF on CAD for Revision Checks
Step-by-step tutorial · 6 min read
Used worldwide for CAD review
Use our free PDF CAD overlay compare from any country — no AutoCAD license required. CadPeek is built for contractors, engineers, inspectors, and building owners who receive DWG/DXF files by email and need instant browser access. Popular in the US, Canada, UK, Australia, and international projects with bilingual layer naming.
United States
NFPA, AHJ, MEP contractor, shop drawing review, IBC
Canada
CAN/ULC, building submittal, code review, MEP drawings
United Kingdom
BS 5839, MEP drawings, BIM exchange DXF
Australia
AS 2118, services drawings, hydraulic plans
Global / Asia
bilingual CAD layers, DXF exchange, imported drawings
PDF CAD overlay compare vs AutoCAD
For viewing and reviewing CAD drawings — not editing geometry.
Built for these roles
- ·Contractors
- ·Engineers
- ·BIM coordinators
- ·Reviewers
FAQ PDF CAD overlay compare
Common questions about our free online PDF CAD overlay compare tool.
- Does the PDF auto-align to CAD?
- Manual alignment with scale and offset sliders. Auto georeference requires shared title block coordinates use sliders to match known corners.
- What PDF types work best?
- Vector PDFs from CAD export align more predictably than scanned raster sheets. Use scale/offset sliders for either type.
- Can I compare two CAD revisions?
- This tool overlays PDF on CAD. For CAD-vs-CAD, open both in separate tabs or use layer visibility to compare revisions.
- Do I need AutoCAD installed?
- No. All tools run in your browser with WebAssembly CAD engines. Upload DWG or DXF and work immediately on Windows, Mac, Linux, or tablet.
- Is my drawing uploaded to your servers?
- By default, files parse locally in your browser. Upload only happens when you explicitly create a Share link or use cloud features.
- What is the free file size limit?
- Free accounts can open files up to 15MB. Starter ($8.8/mo) supports 50MB, Pro 100MB, and Team 200MB per drawing.
- Which DWG versions are supported?
- AutoCAD DWG R12 through 2024 and DXF (ASCII and binary). Most 2D shop drawings open cleanly.
- Can I use these tools on iPad or Android?
- Yes. The viewer and all tool pages work in modern mobile browsers — useful for field review with the measure tool.
Try PDF & CAD Overlay Compare now
Free PDF CAD overlay compare for contractors, engineers, inspectors, and building owners. Launch the tool above or open the full-screen viewer.