STL to OBJ converter

Drop a STL file, check the preview, download OBJ. The conversion runs in your browser, so your model never leaves your device.

Convert the attached STL file to OBJ

Files are processed entirely in your browser. Nothing is uploaded to a server.

Any 3D edit is just a prompt away.

How the conversion works

STL is the standard mesh format in 3D printing: a plain list of triangles with no units, no color, and no materials. Nearly every slicer and CAD tool reads it.

The converter writes a plain OBJ that imports cleanly into Blender, Maya, and most game engines, which makes it a practical handoff format for further editing.

Frequently asked questions

Does my file get uploaded?

No. Parsing and export run in your browser with WebAssembly and three.js. The file stays on your device, and it works offline once the page has loaded.

What survives the STL to OBJ conversion?

Geometry comes through completely: every triangle, at full precision. Materials, textures, and vertex colors are dropped, because OBJ as written here stores plain triangles only.

Is there a file size limit?

Models up to 8 million triangles work. STL files can be any size below that; other formats stop at 300 MB. Heavier meshes take longer rather than failing outright; if a file is unwieldy, reduce its triangle count first with the reduce tool.

More STL conversions

STL → PLY STL → GLB All converters

More free 3D file tools

View a model Repair a model Reduce file size Convert 3D files Measure a model Scale a model Split a model Mirror a model Print orientation Print weight & cost

Describe a part. Get a printable model.

GrandpaCAD turns a text prompt into a ready-to-print 3D model. Functional parts, organic shapes, multi-color prints. No CAD skills needed.

"Model a snap-fit clip that holds a phone charging cable on a desk edge up to 25 mm thick."

3 free generations, no card required

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STL to OBJ converter

Drop a STL file, check the preview, download OBJ. The conversion runs in your browser, so your model never leaves your device.

Convert the attached STL file to OBJ

Files are processed entirely in your browser. Nothing is uploaded to a server.

Any 3D edit is just a prompt away.

How the conversion works

STL is the standard mesh format in 3D printing: a plain list of triangles with no units, no color, and no materials. Nearly every slicer and CAD tool reads it.

The converter writes a plain OBJ that imports cleanly into Blender, Maya, and most game engines, which makes it a practical handoff format for further editing.

Frequently asked questions

Does my file get uploaded?

No. Parsing and export run in your browser with WebAssembly and three.js. The file stays on your device, and it works offline once the page has loaded.

What survives the STL to OBJ conversion?

Geometry comes through completely: every triangle, at full precision. Materials, textures, and vertex colors are dropped, because OBJ as written here stores plain triangles only.

Is there a file size limit?

More STL conversions

STL → PLY STL → GLB All converters

More free 3D file tools

View a model Repair a model Reduce file size Convert 3D files Measure a model Scale a model Split a model Mirror a model Print orientation Print weight & cost

Describe a part. Get a printable model.

GrandpaCAD turns a text prompt into a ready-to-print 3D model. Functional parts, organic shapes, multi-color prints. No CAD skills needed.

"Model a snap-fit clip that holds a phone charging cable on a desk edge up to 25 mm thick."

3 free generations, no card required