Updated June 2026 · runs 100% in your browser
OBJ to STL
Convert OBJ models to STL for 3D printing on your device. No upload, no sign-up, no limits.
Drop OBJ 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 OBJ files and download STL 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 OBJ to STL
STL is what most slicers and 3D printers expect. This converts an OBJ mesh into a clean binary STL.
Frequently asked questions
How do I use OBJ to STL?
Drop OBJ files and download STL models.
Is it ready to 3D print?
The geometry converts directly; check scale and watertightness in your slicer as usual.
Is my file uploaded?
No. It is converted on your device with a local copy of three.js; nothing is uploaded.
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.
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.