Free 3DS (.3ds) to STL (.stl) converter — running entirely in your browser. No upload, no signup, no file limits: your files never leave your device.
STEP · IGES · BREP · STL · OBJ · PLY · GLB · glTF · 3MF · COLLADA · AMF · FBX · 3DS · OFF · LAS · PCD · XYZ · PTS
The .3ds format comes from Autodesk 3D Studio for DOS and is one of the oldest mesh formats still in circulation. Despite hard limits — 16-bit vertex counts, 8.3 material names — enormous archives of legacy models exist in .3ds, so being able to read it still matters.
STL is the de-facto standard for 3D printing. It describes a model purely as a mesh of triangles — no color, no units, no assembly structure — which makes it simple, universally supported, and the required input for virtually every slicer, from PrusaSlicer and Cura to resin-printer tools.
| 3DS | STL | |
|---|---|---|
| Geometry | Polygon mesh | Triangle mesh |
| Units | No | No — unitless numbers |
| Colors & materials | Basic materials | No |
| Animations | Limited | No |
| Typical use | Legacy model archives | 3D printing |
Yes — free with no accounts, no watermarks and no file-size limits. Conversion runs on your own machine, so there are no server costs behind it.
No. The converter runs entirely in your browser using WebAssembly. Your .3ds file never leaves your device, which makes it safe for confidential designs.
Yes — parts and assembly hierarchy are preserved where STL supports them, and you can optionally merge everything into a single mesh during conversion.
Yes. Every converted model opens in the built-in 3D viewer with an assembly tree, display modes and section views, so you can inspect the result first.
3DS is reduced to geometry, hierarchy and one flat base color per part before export, so format-specific metadata and animation do not carry through. The STL result also has no units, colors, material data or part names, so keep the source alongside it.
Which file format should you actually print from? A practical ranking of STL, OBJ, 3MF and AMF for FDM and resin printing, with free conversion tools.
Most online CAD converters upload your intellectual property to unknown servers. Learn what actually happens to uploaded files and how client-side conversion avoids the risk.