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Input and output formats

The converter reads 8 model formats plus a ZIP archive, and writes 8. Not every combination is possible, because a format is only offered as a target when the file you upload can actually be represented in it.

• A PLY file can be a mesh or a bare point cloud, so only GLB, glTF and STL are offered as targets. OBJ, FBX, 3MF and OFF need faces, and a point cloud has none.
• 3MF works in both directions. It can be a source — converted out to GLB, glTF, OBJ, FBX, STL and OFF — and it is also a target, so any mesh format can be written into a 3MF package with geometry and colour. It is the one path off STL that carries colour, which STL cannot.
• 3DS, PCD, LAS, LAZ, STEP, DAE, USD, VRM, VRML and X3D can be opened in the GLBKit viewers, but the converter drop zone does not accept them and they are not offered as conversion sources or targets.
• Output packaging follows the target: GLB, FBX, STL, PLY and OFF download as single files, while glTF and a materialised OBJ arrive as a ZIP because they are several files that must stay together.

What conversion changes about your model

A conversion is a re-serialisation, not an edit. Nothing is simplified or resampled, so the geometry you upload is the geometry you get back. What does change is the set of attributes each format is able to store — and the download tells you exactly which ones were kept for the target you chose.

• No decimation, welding or vertex reduction happens at any point. Triangle counts, vertex counts and coordinates come through as they are, so the converted file is a faithful re-serialisation rather than a re-optimised model.
• Each writer emits what its format has a field for. STL keeps triangle geometry and normals and has no concept of materials, textures, UVs, animations, cameras or lights, so all of those are dropped on the way out. OBJ keeps material colours and rasterises textures to PNG where the image can be read back, but drops per-vertex colour data. OFF keeps triangle geometry only. PLY keeps geometry, normals and vertex colours, but not image textures.
• Animations, cameras, lights and the scene hierarchy survive only when the target is GLB, glTF or FBX. Converting to STL, PLY, OBJ, 3MF or OFF flattens the scene to geometry.
• Transforms are baked into world-space vertex positions on export, so the object hierarchy is gone in every format. There is no unit conversion either: coordinates are written unchanged, which means a model authored in metres stays in metres rather than being scaled to another target's convention.
• Point colour survives where the format carries it. A PLY point cloud keeps its colours through GLB, glTF and 3MF; STL cannot represent them, and the conversion is blocked earlier because a point cloud has no triangles to write.
• GLB and FBX embed textures in a single file. glTF is written as a separate .gltf, .bin and image set, and a materialised OBJ arrives with its .mtl, so both download as a ZIP.