Why do sculpting artists still request OBJ when newer formats exist?

Because their tools treat OBJ as the lowest common denominator: import is instant, the mesh arrives exactly as authored, and no PBR or rig data gets mangled along the way. For a brush-ready static mesh, the format's simplicity is a feature, not a limitation.

My model shows up grey in another application — what went wrong?

Almost always a missing or misplaced .mtl file, or texture paths inside it that no longer resolve. OBJ materials live in that sidecar, so the mesh alone imports colorless. Re-export keeping the file family together, or convert to GLB to embed everything in one file.

How do I stop OBJ texture paths from breaking between machines?

Keep the .obj, the .mtl and the images in one flat folder with lowercase, space-free filenames. Relative paths survive folder moves; absolute paths and exotic characters do not. If paths are already broken, fixing them by hand in the .mtl is a two-minute text edit.

Is OBJ the right file to send into a CAD workflow?

For visualisation and mesh reference, yes — most CAD suites import OBJ without fuss. For parametric editing it is the wrong tool: OBJ carries no feature history, so the model arrives as dead geometry. Export STEP from the CAD side when editability matters.

Why is my OBJ export so much larger than the GLB it came from?

Three compounding reasons: the text format stores every vertex as readable decimal numbers, textures sit outside as separate files that add their own weight, and there is no binary packing or compression. Convert OBJ to GLB and the same model typically shrinks several-fold.

OBJ Converter — Free, In-Browser

Open a OBJ model, preview it, and send it to any of the five output formats — with a clear note of what each destination keeps.

Upload 3D Model

Drag and drop or click to upload. Translation runs locally in your browser.

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

GLBGLTFOBJSTLFBXPLY

3D Preview

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Kept

Mesh geometry, UV coordinates and basic material color/texture references via the .mtl sidecar

Lost

Animation, skeletons, PBR channels and any scene hierarchy beyond simple groups

Use for

Static-mesh exchange with tools that predate glTF — CAD viewers, sculpting suites, legacy DCC versions

About the OBJ format

OBJ outlived every format of its generation because it refuses to die: a plain-text list of vertices and faces that virtually every 3D program written in the last thirty years can parse. There is no scene graph worth the name, no animation, no PBR — just geometry, UVs and whatever the companion .mtl file manages to describe. That ceiling is exactly why it survives: when an unknown toolchain has to exchange a static mesh, OBJ is the format nobody has to think about.

Need the model itself?

Skip the search — generate a OBJ model with AI

If you don't have a {target} file yet, 3D AI builds one from a text prompt or a reference photo and exports it ready for your pipeline. Free daily quota, no credit card.

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Runs in your browser · Free daily generations · GLB output

Take OBJ to another format

One click pre-loads the converter with OBJ as the source and your chosen target locked in.

OBJ → GLB OBJ → GLTF OBJ → STL OBJ → PLY

Routes that produce OBJ

Already working in another format? These paths land on OBJ.

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

Where {fromName} files come from

CAD and product-design tools exporting meshes for visualisation, where STEP is overkill and OBJ is universal
Sculpting and retopology work in ZBrush or 3D-Coat, which use OBJ as their import/export baseline
Photogrammetry and scan-processing software writing predictable plain-text meshes

Where {fromName} files go next

Legacy DCC versions that predate glTF support open OBJ natively — no plugins, no questions
Slicers accept OBJ more readily than GLB, though STL remains the safer print target
Keep the export family together: .obj, .mtl and every referenced texture travel as a set

Every conversion route

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

FAQ