Free PLY to STL Converter
Lightning-fast PLY to STL conversion — 100% in your browser. Your files never leave your device. Free, no watermark, no sign-up.
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Supports GLB, GLTF, OBJ, STL, FBX, PLY
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PLY vs STL
See what transfers when converting between these two formats.
| Feature | PLY | STL |
|---|---|---|
| Geometry | ||
| Textures | ||
| Materials | ||
| Animation | ||
| Rigging |
All features supported by PLY are preserved in STL.
Why convert PLY to STL?
3D print scan data
Slicers (Cura, PrusaSlicer, Bambu Studio, CHITUBOX) read STL natively. PLY support is uneven — STL is the safer choice for printing.
Send scan meshes to fabricators
STL is the universal mesh-interchange format for service bureaus and rapid-prototyping shops. They rarely accept PLY.
Slicer pre-processing
Some slicers choke on PLY vertex colors or custom attributes. STL's pure-mesh simplicity sidesteps those issues.
Tips for PLY → STL
Vertex colors are dropped
STL has no color support. The converted file is plain geometry — any colors in the PLY are lost.
Watertight mesh required
STL slicers demand manifold geometry to produce valid 3D-printer toolpaths. Scan meshes often have holes, flipped faces, or self-intersections; repair in MeshLab or Meshmixer before sending the file to your 3D printer.
Decimate dense scans
PLY scans can have 5M+ triangles. Decimate before converting to keep STL size manageable for slicers.
Binary STL by default
Fast3D exports binary STL, which is roughly 4x smaller than ASCII STL.
Common issues when converting PLY to STL
Slicer reports 'non-manifold edges'
Fix
Scan meshes frequently have defects — holes, flipped faces, self-intersections. Run Meshmixer's Analyze → Auto Repair, or MeshLab's Clean Faces tool, before slicing.
STL file is enormous
Fix
PLY scans typically have very dense meshes. Decimate in MeshLab (Quadratic Edge Collapse) or Blender (Decimate modifier) before converting. For 3D printing, 0.5M-1M triangles is usually sufficient.
Print scale is wrong
Fix
PLY stores coordinates in source-file units, often meters for scans. STL slicers typically expect millimeters. Scale by 1000× in the slicer.