Free online SKP to PLY converter

A scanner, point-cloud application, or mesh-processing tool may require a .ply mesh instead of SketchUp's native .skp project file. Converting creates an exchangeable polygon mesh, but SketchUp-specific editing and scene data are not retained.

What the SKP format is

SKP is SketchUp's native 3D project format, used for architectural models, interiors, engineering concepts, furniture, and site layouts. Files created by SketchUp Desktop and SketchUp for Web can contain geometry, groups, components, tags, scenes, cameras, materials, dimensions, shadows, and model metadata. The format is also common in 3D Warehouse downloads.

What the PLY format is

PLY, or Polygon File Format, is a mesh format originally associated with Stanford 3D scanning research. It stores vertices and faces and can also store properties such as normals, per-vertex color, and, when supported by the application, texture coordinates or other vertex attributes. PLY is used by scanning, reconstruction, scientific visualization, and mesh-processing software such as MeshLab and CloudCompare.

PLY is suitable when the receiving program needs explicit polygon data rather than a SketchUp scene. Binary PLY files are smaller and faster to read; ASCII PLY files are human-readable but usually larger. PLY does not provide a universal unit system, so the receiving application must interpret the model scale correctly.

Convert SKP to PLY online

1. Open the SKP-to-PLY converter on 101convert.com; the conversion can be performed for free without installing software.
2. Upload the .skp file and choose PLY as the output format.
3. Start the conversion and download the resulting .ply file.
4. Open the output in the target application and check its scale, face orientation, completeness, and available colors.

Use a local workflow instead for confidential models, very large files, or exports requiring control over cleanup, triangulation, and vertex attributes.

Convert locally with SketchUp and MeshLab

1. Open the model in SketchUp Desktop and remove construction geometry, unnecessary components, and excessive detail. Check face orientation and hide or delete objects that should not be exported.
2. Choose File → Export → 3D Model and export a .dae Collada file. If the installed SketchUp edition provides OBJ export, .obj is also suitable and may be simpler for mesh interchange.
3. Open MeshLab and select File → Import Mesh, then load the exported .dae or .obj file.
4. Inspect the imported mesh for missing faces, reversed normals, duplicate or degenerate faces, unwanted hidden geometry, and incorrect scale. Repair or rescale it when necessary.
5. Choose File → Export Mesh As, select PLY, and choose binary or ASCII output. Enable normals or vertex colors only when the source contains them and the destination supports them.
6. Save the result under a new name such as model.ply, then verify it in the final application.

Collada texture images may be exported separately, but PLY does not reliably preserve SketchUp's material library, transparency settings, or image-texture workflow. Keep the original .skp file and any exported texture files if visual appearance must be reproduced.

Quality and compatibility limits

• PLY preserves polygon geometry and selected vertex attributes, not SketchUp components, groups, tags, scenes, dimensions, shadows, cameras, metadata, or parametric behavior. The result may open as one mesh or as several mesh elements.
• SketchUp faces can have reversed orientation, internal surfaces, very small edges, or 2D details that become unwanted or invalid mesh geometry. Inspect the model before and after export.
• Curved SketchUp surfaces are tessellated into polygons. A high-detail model can produce a large PLY file; reducing curve and component detail lowers file size but also reduces geometric accuracy.
• Confirm the destination's expected units, such as millimeters, centimeters, or meters, and rescale the mesh if the import is too large or too small.
• Use binary PLY for ordinary exchange and ASCII PLY when manual inspection or a binary-incompatible tool requires it.