Free 3D Model & Mesh Converter Online
Convert between STL, OBJ, PLY, GLB, 3MF and OFF. Move models between 3D printing, editing and web/AR, turn a scan into a printable mesh, or export to the modern 3MF format — all free, private, and with no sign-up.
Frequently Asked Questions
How do I convert a 3D model for free?
Pick the tool that matches your formats (for example STL to OBJ), upload your model, pass the quick security check, and download the converted file. No sign-up, no watermarks, and no fees.
Which 3D format should I use?
Use STL or 3MF for 3D printing, OBJ or PLY for editing and rendering, and GLB for the web, AR and real-time viewers. Convert whenever a tool expects a different format than you have.
Will the geometry stay accurate?
Yes. Vertices and faces are carried over unchanged - only the encoding changes. Note that STL, being geometry-only, drops colour and materials that richer formats like GLB or 3MF can store.
What is the difference between STL and 3MF?
STL is the long-standing, universal printing format that stores only a triangle surface. 3MF is its modern successor: a compact ZIP-based package that can also carry units, colour and print settings.
Is there a file size limit?
You can convert models up to 250 MB, which covers the vast majority of real-world meshes.
Are my 3D models private?
Yes. Every conversion runs in an isolated, network-free sandbox entirely in memory. Your file is never written to disk, never shared, and is deleted the instant your download is ready.