Convert STL to OBJ Online — Free
Upload a Stereolithography file and download it as Wavefront OBJ. Runs entirely in your browser — no server uploads.
About These Formats
Stereolithography
STL stores only triangulated geometry — no colors, textures, or animations. It is the de-facto standard for 3D printing slicers and CAD software.
Used with
3D printing slicers (Cura, PrusaSlicer, Bambu Studio), CAD tools, rapid prototyping workflows.
Wavefront OBJ
OBJ is a simple, human-readable text format that stores 3D geometry (vertices, faces, texture coordinates, and normals). It is one of the most universally supported formats.
Used with
Blender, Maya, Cinema 4D, 3ds Max, ZBrush, and virtually any 3D application.
What Transfers from STL to OBJ
A breakdown of which data survives the STL-to-OBJ conversion.
3D Geometry
Vertices, faces, and normals always transfer
Textures & Materials
STL has no texture data
Animations
STL does not store animations
Vertex Colors
STL does not support vertex colors
Multiple Objects
STL stores a single mesh
When to Convert STL to OBJ
Convert STL to OBJ for maximum compatibility with 3D software. OBJ is supported by virtually every 3D application including Blender, Maya, Cinema 4D, and ZBrush. It is a simple text format that stores geometry and basic material references.
Other STL Conversions
Tips for the Best STL to OBJ Result
Keep the OBJ, MTL, and all texture images in the same folder. MTL paths are relative — separating the files breaks material references.
Unity uses a left-hand coordinate system; OBJ uses right-hand. If imported geometry looks mirrored, flip the Z-axis in Unity's import settings.
For files over 50 MB, run the Mesh Optimizer first to reduce polygon count and improve compatibility with older software.
When sharing an OBJ, zip the OBJ, MTL, and all texture images together so the recipient's software can resolve the material paths.
Common Reasons to Convert STL to OBJ
- →DCC editing: importing into Blender, Maya, Cinema 4D, ZBrush, or any major 3D application for editing or rendering
- →Maximum compatibility: OBJ is universally supported — use it when you don't know which software the recipient will use
- →CAD and simulation: many engineering and CAD packages accept OBJ for geometry import and measurement
- →Client delivery: a transparent, widely-readable format when sharing with collaborators who need broad tool support
Frequently Asked Questions
How do I convert STL to OBJ?
Upload your .stl file using the tool above, confirm the source format is set to STL and the target is OBJ, then click Convert. The file processes in your browser and you can download it immediately.
Does converting STL to OBJ preserve textures?
OBJ stores geometry only. Textures and materials will not be included in the output.
Is this converter free?
Yes, completely free. No account, no usage limits, no hidden fees.
Are my files uploaded to a server?
No. All processing happens locally in your browser using WebGL. Your files never leave your device.