I edited a scan as OBJ — how do I return it to the scan pipeline?

This conversion, precisely: OBJ is the editing format, PLY is the pipeline's native tongue. Geometry returns unchanged; just remember any texture work stays behind, since the scan pipeline's PLY world speaks vertex data, not image maps.

Will the PLY be smaller than the OBJ?

Usually yes — binary PLY packs vertices tightly and sheds the .mtl and image files entirely. The exception is ASCII-targeted PLY, which can rival OBJ's size. For storage and pipeline transfer, the binary default is the compact choice.

What's the practical difference between OBJ and PLY for the same mesh?

Encoding and audience: OBJ is text with MTL material references, aimed at DCC tools; PLY is binary element lists with per-vertex attributes, aimed at scanning/metrology software. Geometry transfers one-to-one; materials and UVs do not (PLY has no UV concept).

Do UV coordinates survive into PLY?

No — PLY's vertex model has no UV slot. Textured OBJs arrive as bare (or vertex-tinted) shells. If your pipeline needs both texture maps and scan-tool compatibility, keep two branches: OBJ/GLB for display, PLY for analysis.

Does vertex order or grouping change?

Vertices keep their order in the element list; o-groups flatten into one PLY mesh (the format has no hierarchy). Per-part analysis needs pre-split files — group-free OBJs convert cleanly, grouped ones merge.

Will PLY's per-vertex normals improve anything from my OBJ?

OBJ usually implies normals from face winding; PLY writes them explicitly per vertex. The visible difference is nil in most viewers, but some analysis tools require explicit normals — this route guarantees them.

OBJ → PLY OBJ to PLY Converter — Online & Free

Change a OBJ model into PLY in one pass, then see exactly what the new file keeps, flattens or drops before you download it.

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Reads GLB, GLTF, OBJ, STL, FBX, PLY

GLBGLTFOBJSTLFBXPLY

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Kept

Full geometry, UVs, and per-vertex color where the OBJ pipeline actually had it

Lost

Material definitions and texture references — PLY does not do .mtl-style material files

Use for

Routing edited or sculpted meshes into scan-processing and measurement workflows

Using the PLY file afterwards

Compare against scans in MeshLab, feed research pipelines, or archive as tool-independent geometry

OBJ to PLY trades material scaffolding for attribute precision: the mesh ships without .mtl packaging but with PLY's per-vertex data model — exact normals, optional vertex colors — in the format that scanning and metrology ecosystems treat as home. Geometry is untouched; the audience changes.

What changes in the file

1
Texture images have no PLY home — models that relied on image maps come through uncolored
2
Vertex colors only carry if they existed as OBJ vertex colors, which is rare outside scan-editing workflows
3
The file set collapses: no .mtl, no images, one self-contained PLY

OBJ → PLY: format spec comparison

Hard facts side by side — what each format is, where it comes from and what it can hold.

Spec	OBJSource format	PLYTarget format
Developer	Wavefront Technologies	Stanford University (Stanford PLY)
First released	1980s (Princeton Univ. lineage)	1994 (Stanford scan project)
Data model	Plain-text vertex/face lists + MTL sidecar	Element lists (vertex/face), ASCII or binary
Textures	UV coords only; MTL references image files	Per-vertex colors only (no UV maps)
Animation	None	None
Typical size	Large (ASCII vertices), shrinks with -binary variants	Compact binary; dense scans grow fast
Openness	Open, informal spec	Open, documented
Primary use	DCC interchange, sculpting, 3D printing prep	3D scanning, photogrammetry, scientific meshes

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More ways out of OBJ

OBJ → GLB OBJ → GLTF OBJ → STL

Other routes into PLY

GLB → PLY GLTF → PLY STL → PLY FBX → PLY

Every conversion route

Per-format pages and all 25 format-to-format paths — each one pre-configures the converter for that exact job.

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