LWS to STL Converter
FileFlip converts LWS to STL entirely inside your browser, using Assimp compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an LWS file to STL?#
- Drop your LWS file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to STL and the conversion starts on its own. FileFlip downloads 11.2 MB of WebAssembly the first time and nothing after that, then runs Assimp on your own machine.
- Save the STL file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting LWS to STL lose quality?#
Not in the sense of pixels or samples. Converting LWS to STL rebuilds the file in STL's own model rather than re-encoding it, so everything STL can represent comes through exactly and anything it cannot has to be dropped. Expect the geometry to be exact, and anything the target has no place for, such as a rig, to be left behind.
Is it safe to convert LWS files online?#
Yes, because nothing is uploaded. FileFlip converts LWS files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What LWS to STL actually does to the file#
Converting LWS to STL runs on Assimp, downloads 11.2 MB of WebAssembly the first time and nothing after that, rebuilds the file in the target's own model, and drops materials, textures and skeleton and animation.
| Engine | Assimp |
|---|---|
| Conversion path | One step: LWS → STL |
| Downloaded to your browser | 11.2 MB, once, then cached by your browser |
| Quality | Rebuilt in the target's model |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Materials | Dropped | The target format has nowhere to put it. |
| Textures | Dropped | The target format has nowhere to put it. |
| Skeleton and animation | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- the target stores triangles and nothing else, so materials, colours, and texture coordinates have nowhere to go
- if the source carries a skeleton or animation, this target has no place to store it
What is an LWS file?#
An LWS file is a NewTek LightWave scene, a plain-text list of the LWO objects it loads along with the cameras, lights, item hierarchy and keyframed animation that arrange them.
Keep a scene as LWS while it's still being lit, animated and arranged inside LightWave's Layout.
Convert LWS to FBX or glTF once the arranged scene needs to move into a game engine or another DCC tool.
What is an STL file?#
An STL file is a triangle mesh created by 3D Systems in 1987 for its stereolithography 3D printers, storing nothing but a flat list of triangle facets and their normals, with no colour, material or unit of measurement attached.
Use STL when the only destination is a 3D printer's slicer, which is all the format was designed to feed.
Convert STL to 3MF when colour, material or unit information needs to travel with the geometry, since STL has nowhere to put any of it.
LWS to STL questions people ask#
What is an LWS file?
An LWS file is a LightWave scene: a plain-text file that lists the LWO objects it uses and adds the cameras, lights, parenting and animation that arrange them in Layout, LightWave's animation and rendering module.
Can I open an LWS file without the LWO objects it references?
Not usefully. An LWS file stores references to LWO object files by name rather than the geometry itself, so LightWave (or any other LWS reader) needs those LWO files in the expected location to reconstruct the scene.
Is LWS the same as an LWO file?
No. LWO holds a single object's geometry and surfacing, while LWS is the scene that arranges one or more LWO objects with cameras, lights and animation. The two formats are a pair: an LWS file is only complete alongside the LWO files it loads.
What is an STL file used for?
An STL file is the standard input for 3D printer slicing software, storing a model's surface as a list of triangles with nothing else attached. Slicers use it to work out where to lay down material layer by layer.