DWG → STEP · ISO 10303 · Windows

The geometry
comes out
correct.

Cadyon 3D Converter reads the 3D solids out of your DWG files — including everything nested inside blocks and inserts — and writes ISO 10303 STEP that other CAD systems open correctly.

Download free — no signup How we verified it
3,656
production drawings verified 5 s.f.
volume match Exact
face counts
SAMPLE · DWG SOLID→ STEP
6" 90° LR ELBOW · FLANGED · NESTED IN 3 BLOCKS Wireframe · 612 edges
The only claim that matters

Verified face by face against AutoCAD's own output.

Every solid Cadyon 3D Converter writes was compared with the geometry AutoCAD itself reports for the same object, across 3,656 production drawings. Not sampled. Not spot-checked. Face by face.

Drawings tested 3,656
Volume agreement 5 sig. figs
Face counts Exact match
Nested blocks & inserts All resolved

Test your own drawing in under two minutes. The free download has no account, no email and no signup behind it.

The Cadyon family

One converter shipping. Two tools on the way.

Cadyon 3D Converter is available now. Isometrics and Plant are in development — no dates announced.

Shipping now

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.

ISO 10303Nested blocksBatchCommand line
02ISO SHEET Coming

Cadyon Isometrics

Isometric drawings

Isometric drawing generation, built on the same geometry engine that made the converter exact. In development — no date announced.

Isometrics
Tell me when it ships In development
03PLANT KIT Coming

Cadyon Plant

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.

PlantPiping
Tell me when it ships In development
Pricing

Buy it once. Keep it.

One binary for every tier — a licence key unlocks Pro or Advanced. Payment and licence keys are handled by Lemon Squeezy.

Free
€0forever
  • +Personal, non-commercial use
  • +DWG inputs up to 1 MB
  • +One file at a time
  • +No account, no email, no signup
Download
Evaluation
25conversions
  • +No size limit, no key, no clock
  • +One drawing at a time
  • +Starts on first launch, ends after 25 drawings
  • +For evaluation, including at work
Included in the download
ProOne-time
€199once
  • +Commercial use
  • +No file size limit
  • +Many drawings or a whole folder at once
  • +One person, one computer, movable
  • +All 1.x updates, installed automatically
Buy Pro
AdvancedMost capable
€599once

For production work and automation: all of Pro, plus the command line and diagnostics.

  • +Command line: convert and check drawings from scripts, with JSON output and exit codes
  • +Diagnostics for every solid: faces built and skipped, repairs and failures, in the app and as a saved report
  • +Commercial use
  • +No file size limit
  • +Many drawings or a whole folder at once
  • +One person, one computer, movable
  • +All 1.x updates, installed automatically
Buy Advanced
Compare Free Evaluation Pro Advanced
Price€0€0€199 once€599 once
UsePersonal, non-commercialEvaluation onlyCommercialCommercial
ConversionsUnlimited25 drawingsUnlimitedUnlimited
File sizeUp to 1 MBNo limitNo limitNo limit
Drawings at onceOneOneMany, or a folderMany, or a folder
Command line———✓ convert and check, JSON, exit codes
Diagnostics per solid———✓ in the app and as a report
Licence keyNone neededNone neededOne person, one computerOne person, one computer
UpdatesAutomaticAutomaticAll 1.x, automaticAll 1.x, automatic
Download

Test the claim on your own drawing.

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.

Download Cadyon 3D Converter Windows desktop
Delivery
Direct download, no account
Licensing
One binary, key unlocks Pro
Payments
Lemon Squeezy
Updates
Automatic, all 1.x included