Convert OBJ to PLY
Free OBJ to PLY converter that runs in your browser. See real dimensions before you download.
How to convert OBJ to PLY
- Drop your OBJ file (with its textures, if separate) onto the converter — it opens in your browser, nothing is uploaded.
- Check the preview and the dimensions in mm; fix units or the up axis in “Units & orientation” if the size or orientation looks wrong.
- Choose PLY as the output and click Convert. Several files download as one ZIP.
What carries over from OBJ to PLY
| OBJ | PLY | Result | |
|---|---|---|---|
| Colour / materials | Yes | Yes | Kept |
| Textures | Yes | No | Dropped |
| Units stored in file | No | No | Numbers in mm |
| Separate parts | Yes | No | Merged into one mesh |
| Usual up axis | Y | Z | Rotated (switchable) |
About OBJ files
OBJ comes from Wavefront Technologies' Advanced Visualizer software in the 1980s, and it has outlived the product. A file is plain text: lines starting with v define vertices, vt texture coordinates, vn normals, and f faces that reference those lists by index. Faces may be triangles, quads or larger polygons, and the g and o keywords group faces into named objects. Appearance is not in the OBJ at all; a line called mtllib points to a separate .mtl file that lists materials with diffuse colours and texture image names. The format is verbose, has no official unit and no scene hierarchy or animation, but it is trivial to read and write. That is why scanners, photogrammetry tools, sculpting programs and game pipelines still use it to move static meshes around.
About PLY files
PLY was developed in the mid-1990s by Greg Turk and colleagues at the Stanford Graphics Lab to store data from 3D scanners, and the Stanford Bunny and Happy Buddha models made it famous. A PLY file starts with a text header that declares elements, such as vertex and face, and the properties each element has. The body then follows in ASCII, binary little-endian or binary big-endian. Because properties are declared in the header, a file can carry any extra per-vertex data: normals, colour channels, intensity, confidence or custom scalars. This flexibility made PLY a standard output for scanners, depth cameras, photogrammetry and point-cloud tools. It can store a point cloud with no faces at all, or a polygon mesh. It does not define units or a scene structure.
3D printing notes
Slicers import OBJ geometry and ignore the material file, so what you print is the shape only. Bambu Studio and OrcaSlicer can use the colours from an OBJ for multi-colour assignment on import, but results depend on the exporter. The main trap is orientation and scale. Blender usually writes Y-up files while slicers expect Z-up, so a model may arrive lying on its back, and a model sculpted at one unit per metre can be tiny. MeshShift has an Up-axis fix that rotates Y-up models so they stand upright, shows real dimensions before conversion, and can convert OBJ to STL or 3MF in the browser.
Frequently asked questions
Is this OBJ to PLY converter free and private?
Yes. The conversion runs in your browser with JavaScript and WebAssembly, so your OBJ file is never uploaded to a server. There is no sign-up, no watermark and no daily limit; very large files are limited only by your device's memory.
Why does my OBJ import without its colours or textures?
The colour information is in a separate .mtl file and image files. If the MTL or textures are missing, renamed or in another folder, the importer shows plain grey geometry. Keep the OBJ, MTL and images together, or convert to GLB, which packs them in one file.
Does PLY store colour?
Yes, usually as red, green and blue values attached to each vertex, not as a texture image. Colours are smooth across triangles, which suits scans. Many slicers ignore vertex colour, so use 3MF or another format if you need to preserve it for printing.