How can I convert my OBJ file to STL?

First, click the "Upload..." button and select your OBJ file to upload. Your OBJ file will be uploaded to our servers. When the OBJ to STL conversion has completed, you can download your STL file right away.

How long does it take to convert my OBJ to STL?

Most OBJ to STL conversions complete in a few seconds for typical furniture-model files (a few MB to ~100 MB). The pipeline runs in your browser for most format pairs — no upload to a server, no roundtrip latency. For SKP and BLEND outputs the conversion runs server-side via the native Blender or SketchUp engine, with a hard 5-minute timeout per conversion; most server-side conversions finish in well under a minute.

What does the OBJ to STL conversion preserve?

Materials, UV maps, vertex normals, and scene hierarchy are preserved wherever the STL format supports them. STL is the exception — it is a geometry-only format by design and discards materials and UVs. GLB and GLTF preserve embedded textures inside the file; OBJ produces an accompanying MTL material descriptor; SKP groups components logically with materials applied; BLEND preserves the full Blender scene graph with modifiers.

How does converting OBJ to STL work?

In order to successfully convert a OBJ formatted file to the STL format, our converter tools will perform several initial checks to ensure the file provided is indeed a OBJ file. There are many files out there where the file type extension does not match the data contained within the file. Along with these file type checks, our tools will do additional checks to ensure the file is correctly formatted to match the provided file type.

What if I don't have a OBJ file to convert yet?

Browse the FurniMesh 3D furniture library — every model exports natively to STL (visit https://furnimesh.com/library/format/stl/ for the STL catalog). Or generate a custom 3D model from any furniture photo with the Image to 3D AI generator at https://furnimesh.com/image-to-3d/ — output formats include STL natively.

Home›Convert 3D Models›OBJ to STL Converter

OBJ to STL Converter

Convert your OBJ files to STL format for free. No sign up or credit card required.

Convert OBJ files to STL format quickly and securely in your browser. Or skip the conversion entirely — browse free STL 3D models ready to download.

Or take a shortcut

No file to convert yet? A few faster paths:

Free STL 3D models

Free furniture 3D models in STL format — no upload needed.

Open library

AI 3D model generator

Generate a textured 3D model from any furniture photo in under 60 seconds.

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Photorealistic render from a screenshot

Already have a 3D model? Screenshot the viewport and get a photorealistic render in about 30 seconds.

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FAQ

OBJ to STL Conversion FAQ

Get answers to common questions about converting OBJ files to STL format. Learn about the conversion process, file compatibility, and best practices.

File Formats

File format information for OBJ and STL

Detailed information about the source and target file formats, including their capabilities and specifications.

OBJ Format

Extension:OBJ

Full Name:Wavefront OBJ

Type:3D Model

Mime Type:model/obj

Format:Binary

Opens With:Blender, Maya, 3ds Max

OBJ (Wavefront Object): A widely-used, open file format (.obj) for 3D geometry, storing vertex, texture, and normal data. Developed by Wavefront Technologies, it's simple and supports interoperability across 3D software.

OBJ Converter Capabilities

When converting 3D model or mesh files using our OBJ converter, we will attempt to convert color materials into a suitable format for use in the converted file.

STL Format

Extension:STL

Full Name:Stereolithography

Type:3D Model

Mime Type:model/stl

Format:Binary

Opens With:3D Printers, Slicing Software

STL (Stereolithography): A file format (.stl) for 3D printing and CAD, representing surface geometry as a mesh of triangles. It's simple, widely supported, but lacks color or texture data.

STL Converter Capabilities

When converting 3D model or mesh files using our STL converter, we will attempt to convert color materials into a suitable format for use in the converted file.

Information for converting from OBJ to STL

About the OBJ to STL converter

FurniMesh's OBJ to STL converter runs entirely in your browser using a WebAssembly glTF/3D-mesh pipeline — your file never leaves your tab, and the conversion completes in seconds for typical furniture-model files. Materials, UV maps, and scene hierarchy are preserved wherever the STL format supports them (note: STL is a geometry-only format and discards materials by design). There's no sign-up, no watermark, no per-file size cap enforced by the UI — practical limits depend on your browser's available memory.

FurniMesh natively outputs four formats — GLB, OBJ, SKP (SketchUp 2017+), and BLEND (Blender 3.0+). Bridge conversion via this converter additionally produces FBX, STL, GLTF, 3DM (Rhino), IFC, DAE, PLY, OFF, 3DS, and 3MF. Use the converter to bridge between any combination — or skip the conversion step entirely if you don't have a source file yet (the FurniMesh library ships every model in all four native formats pre-rendered).