Free STL to PLY Converter
Lightning-fast STL to PLY 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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STL vs PLY
See what transfers when converting between these two formats.
| Feature | STL | PLY |
|---|---|---|
| Geometry | ||
| Textures | ||
| Materials | ||
| Animation | ||
| Rigging |
All features supported by STL are preserved in PLY.
Why convert STL to PLY?
Scan and photogrammetry pipelines
PLY is the native format for MeshLab, CloudCompare, Open3D, and RealityCapture. Convert STL scan data before running cleanup or analysis tools.
Machine learning datasets
PLY is the default mesh format for PyTorch3D, trimesh, and many computer-vision frameworks. Convert STL training data for ML pipelines.
Add per-vertex attributes
PLY supports custom vertex attributes beyond geometry — useful for storing curvature, classification, or segmentation labels alongside the mesh.
Tips for STL → PLY
STL has no colors to preserve
STL is geometry-only. The converted PLY has no vertex colors initially — but you can add them later in MeshLab or Blender.
Binary PLY is smaller
PLY has ASCII and binary variants. Binary is roughly 4x smaller — Fast3D exports binary PLY by default.
Vertex normals are computed
STL does not store normals explicitly. Fast3D computes them during conversion and writes them as PLY vertex attributes.
Use MeshLab to verify
MeshLab reads PLY natively and renders vertex colors and normals correctly. Use it to verify conversion integrity.
Common issues when converting STL to PLY
PLY file is similar size to STL
Fix
STL and binary PLY store roughly the same data (vertices + faces). PLY is slightly more compact because it stores shared vertices, while STL stores per-triangle data. For much smaller files, apply Draco compression to a GLB version instead.
PLY appears uncolored
Fix
STL has no color data. The converted PLY has no vertex colors either. Add colors in MeshLab or Blender, or stay with STL if you do not need them.
PLY does not import into slicer
Fix
Most slicers prefer STL over PLY. For 3D-printing workflows, stay with STL — PLY is rarely accepted by slicers.