Fast 3D

Free OBJ to STL Converter

Lightning-fast OBJ to STL conversion — 100% in your browser. Your files never leave your device. Free, no watermark, no sign-up.

Upload 3D Model

Drag and drop or click to upload. Files are processed locally in your browser.

Click or drag to upload

Supports GLB, GLTF, OBJ, STL, FBX, PLY

GLBGLTFOBJSTLFBXPLY

3D Preview

No model loaded

Upload a 3D model to preview and convert it

Fast3D AI

No OBJ file? Generate one with AI.

Skip the search — generate a model from text or an image, then convert it to OBJ or any other format in one workflow.

Generate → convert — all on fast3d.org.

Text to 3DImage to 3D

OBJ vs STL

See what transfers when converting between these two formats.

Converting OBJ to STL will lose: Textures, Materials.

FeatureOBJSTL
Geometry
Textures
Materials
Animation
Rigging

Other conversions from OBJ

GLB

OBJ → GLB

Binary glTF, the most common modern 3D format

GLTF

OBJ → GLTF

JSON-based glTF, human-readable

PLY

OBJ → PLY

Polygon File Format, common in 3D scanning

Other conversions to STL

GLB

GLB → STL

Binary glTF, the most common modern 3D format

GLTF

GLTF → STL

JSON-based glTF, human-readable

FBX

FBX → STL

Autodesk FBX, popular in animation pipelines (input only)

PLY

PLY → STL

Polygon File Format, common in 3D scanning

OBJ → STL

Frequently Asked Questions