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Cadyon 3D Converter
DWG → STEP
Reads the 3D solids out of AutoCAD DWG files, including everything nested inside blocks and inserts, and writes ISO 10303 STEP that other CAD systems open correctly.
DWG solids to STEP for €199, one time. No subscription, no account, no signup — and the geometry is verified against AutoCAD’s own output across 3,656 production 3D models.
How we verified itEvery solid Cadyon 3D Converter writes was compared with the geometry AutoCAD itself reports for the same object, across 3,656 production 3D models. Not sampled. Not spot-checked. Face by face.
Test your own drawing in under two minutes. The free download has no account, no email and no signup behind it.
Cadyon 3D Converter and the free Cadyon Viewer are available now. Isometrics and Plant are in development — no dates announced.
DWG → STEP
Reads the 3D solids out of AutoCAD DWG files, including everything nested inside blocks and inserts, and writes ISO 10303 STEP that other CAD systems open correctly.
Open · turn · look inside
Open DWG, DXF, STEP, IGES, BREP, SAT, STL, OBJ, PLY, 3MF, glTF and more in the browser and see the 3D solids inside AutoCAD drawings, read by the converter's own decoder and meshed with OpenCASCADE. Several drawings at once, in their own colours. Nothing to install, and the file never leaves your computer.
Isometric drawings
Isometric drawing generation, built on the same geometry engine that made the converter exact. In development — no date announced.
Plant & piping plugins
Plant and piping plugins for teams whose models live in AutoCAD and have to leave it intact. In development — no date announced.
One binary for every tier — a licence key unlocks Pro or Advanced. Payment and licence keys are handled by Lemon Squeezy.
For production work and automation: all of Pro, plus the command line and diagnostics.
| Compare | Free | Pro | Advanced |
|---|---|---|---|
| Price | €0 | €199 once | €599 once |
| Use | Personal, non-commercial | Commercial | Commercial |
| Conversions | Unlimited | Unlimited | Unlimited |
| File size | Any size for the first 25, then up to 1 MB | No limit | No limit |
| Drawings at once | One | Many, or a folder | Many, or a folder |
| Command line | — | — | ✓ convert and check, JSON, exit codes |
| Diagnostics per solid | — | — | ✓ in the app and as a report |
| Licence key | None needed | One person, one computer | One person, one computer |
| Updates | Automatic | All 1.x, automatic | All 1.x, automatic |
Direct download, no account required. Convert a DWG up to 1 MB free, open the STEP in your target system, and check the geometry yourself.