How to Convert a PLY File to OBJ Online (Free)

Convert a PLY to OBJ free: MeshLab, Blender, handling scan vertex colors vs texture, when to pick OBJ over STL, and how to verify the result.

To convert a PLY file to OBJ for free: open the .ply in MeshLab (free) and export it as OBJ, or do it in Blender — an online converter works for a non-sensitive model. Both are mesh formats, so the geometry is preserved. You convert a PLY (from a 3D scan or photogrammetry) to OBJ in order to edit, texture, or import it into 3D software — because OBJ is read by nearly every tool and can carry a texture via its .mtl file. The tricky part: the PLY's per-vertex colors do not transfer directly into an OBJ texture. This guide covers the conversion, color handling, and when to prefer OBJ over STL.

PLY vs OBJ: why convert to OBJ

PLY (Polygon File Format) is the raw format of 3D scanning: it stores a mesh — or a point cloud — with per-vertex colors and normals. Great for capture, but few mainstream 3D editors use it as a working format. OBJ (Wavefront) is the opposite: universal. Blender, Maya, 3ds Max, Cinema 4D, ZBrush, and most engines read it. Crucially, OBJ handles texture coordinates (UVs) and references an .mtl material file pointing to a texture image — which makes it the right format for a model meant to be reworked or textured.

• Preserved: the geometry, and UV coordinates if the PLY contains them
• To convert: the scan's per-vertex color, which must be baked into a texture for OBJ
• Added: an .mtl file alongside the OBJ describing the material and texture
• Watch out for: keep the .obj, its .mtl, and the texture image in the same folder

The real catch: per-vertex color vs texture

This is the difference to grasp before converting. A scan PLY often stores color point by point (per-vertex color). OBJ, by contrast, doesn't display per-vertex color: it expects an image texture projected via UVs. Two options depending on the result you want: keep geometry only (an untextured OBJ, to be retextured later), or bake the PLY's per-vertex color into a texture. MeshLab does this bake via «Filters → Texture → Convert PerVertex UV to PerWedge» plus a texture projection; Blender does it by baking from Vertex Colors. Without this step, the OBJ comes out gray.

Method 1 — MeshLab (free, ideal for scans)

MeshLab opens PLY natively, handles per-vertex colors, and exports OBJ with its .mtl. It is the most direct tool for photogrammetry data.

1. 1Download MeshLab for free from meshlab.net, then File → Import Mesh (.ply)
2. 2Clean the mesh if needed (stray vertices, small holes) via Filters → Cleaning
3. 3To keep colors, generate a texture from the per-vertex color before export
4. 4File → Export Mesh As → OBJ; MeshLab writes the .obj, the .mtl, and the associated texture image
5. 5Open the OBJ in OmniView 3D to verify the geometry and texture before handing it over

Method 2 — Blender, or an online PLY to OBJ converter

Blender imports PLY and exports OBJ, with fine control over UVs, scale, and baking per-vertex color into a texture: the recommended route if you want a clean textured OBJ. For a non-confidential model, an online PLY → OBJ converter does the geometric conversion in a few seconds, but usually won't recreate the texture from per-vertex colors. For a sensitive scan, stay local with MeshLab or Blender: your data never goes to a third-party server.

OBJ or STL: which to choose after a scan?

The choice depends on the destination. Pick OBJ to edit, retopologize, texture, or import the model into 3D software, a game engine, or a rendering pipeline: it carries UVs, texture, and multiple objects. Pick STL for 3D printing only, when only the shape matters and color is irrelevant. Many reverse-engineering workflows export PLY to OBJ to clean and texture, then to STL at the very end of the chain to print.

Do you need to convert just to view a PLY?

No. To show, rotate, and share a scan with its colors, conversion is unnecessary. OmniView 3D reads PLY, OBJ, GLB, GLTF, STL, STEP, IGES, FBX, and DAE files directly. Upload your .ply as-is, get an interactive 3D viewer in 60 seconds, and share a link: the other person sees the colored model in their browser, with no software. You only convert to OBJ when you need to edit or texture the model.