Free online CAD viewer
A practical CAD viewer for drawings and models.
Caddis brings DWG, DXF, STEP, STL, and other common CAD formats into one local-first review workspace. Open a file, examine it, measure it, and add feedback without changing the source.
No account required for local viewing. Files stay on your device unless you opt into Cloud.Which CAD files can Caddis view?
Caddis supports DWG, DXF, STEP, STP, STL, OBJ, PLY, and IFC files. It is built for reviewing and communicating around drawings and models, not for engineering certification.
How to get started
- Open the Caddis web viewer.
- Choose a supported CAD file from your device.
- Inspect, measure, and mark up the file as needed.
Built for practical review
- 2D drawings and 3D models in one workspace
- Layer, measurement, and markup tools
- Local-first file handling
- Optional cloud sync and revocable share links
Your drawings stay under your control
Caddis is local-first: opening a supported file for local review does not require uploading it. If you choose Caddis Cloud, you can continue a project across devices or create a revocable, read-only link.
Frequently asked questions
Do I need an account to use Caddis?
No. You can open and review supported files locally without creating an account. An account is only needed for optional cloud features.
Are my CAD files uploaded?
Not for local viewing. Caddis processes supported files on your device. Cloud storage and share links are opt-in per project.
Can I use Caddis offline?
Local review is designed to work on your device. Cloud sync and share links naturally require an internet connection.
Which CAD formats can Caddis open?
Caddis supports DWG, DXF, STEP, STP, STL, OBJ, PLY, and IFC files in the web viewer.
Explore Caddis tools
DWG viewerDXF viewerSTEP viewerSTL viewerOpen DWG without AutoCAD