Updated June 2026 · runs 100% in your browser
STL to OBJ
Convert STL 3D models to OBJ on your device. No upload, no sign-up, no limits.
Drop STL files here
or click to choose
🔒 Processed on your device · 0 bytes uploaded
Loads the 3D engine (~1 MB) on first use — cached after that.
How it works
Drop STL files and download OBJ models.
It all runs in your browser with a local copy of three.js — your model never leaves your device, and it stays free, unlimited and private.
About STL to OBJ
STL is the standard 3D-printing format (triangles only); OBJ is widely supported by 3D apps and keeps the same geometry.
Frequently asked questions
How do I use STL to OBJ?
Drop STL files and download OBJ models.
Will materials be included?
STL has no materials, so the OBJ contains geometry only.
Is my file uploaded?
No. It is converted on your device with a local copy of three.js; nothing is uploaded.
What is an STL file?
STL is the standard 3D-printing format. It describes a model's surface as a mesh of triangles but stores no color or texture, which is why it's used mainly for printing rather than rendering.
What is an OBJ file?
OBJ is a widely supported 3D model format that stores geometry and, via a companion .mtl file, material and texture references. It's a common interchange format between 3D applications.