windows app
Convert STL to 3MF
Convert STL 3D models to 3MF 3D models locally on Windows. No upload, no signup, no watermark.
features
what the app does
- Paste from clipboard — Ctrl+V joins the queue (e.g. a Win+Shift+S screenshot lands without saving to disk).
- Batch convert whole folders, sub-folder structure preserved.
- Auto-convert watcher — point the app at a watched folder; converted files appear in your output folder.
- Right-click .stl files in File Explorer — "Convert to 3MF" opens the app pre-loaded with your selection.
- Ten UI languages, light + dark themes following the system.
- Offline by design — no telemetry, no account, no user-data exfiltration.
details
STL to 3MF on your pc
STL to 3MF Converter helps you convert STL 3D models to 3MF 3D models on Windows with local processing and a simple queue.
how it works
The app uses three.js to read your 3D models and create 3MF 3D models on your Windows PC. Convert stl to 3mf without sending anything to a server.
paste from clipboard
Press Ctrl+V to drop a copied 3D model straight into the queue. If you copied a model from another app, it lands here ready to convert.
batch conversion
Run one job on a whole folder of 3D models at once. Subfolders are kept in the output, so the folder layout stays the same.
auto-convert watcher
Use the Auto-convert page to choose a watched folder and an output folder. Keep the app in the Windows system tray, and new 3D models are converted in the background as they arrive.
right-click in explorer
A native shell extension adds Convert to 3MF to the File Explorer menu for .stl items. The app opens with your selection already loaded, so you can start faster.
languages & themes
The UI ships in ten languages. Light and dark themes follow your Windows system theme automatically.
offline by design
No telemetry, no account, and no user-data exfiltration. Your 3D models stay on your device from start to finish.
free & pro
The free version lets you convert STL to 3MF with no file size or file count limits. Upgrade to Pro with a one-time lifetime purchase to remove ads and unlock batch conversion. No subscriptions or recurring payments.
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gltf to glb
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