Free online STL converter. Convert 3D files between STL (binary or ASCII), OBJ, PLY, GLB and GLTF in seconds — directly in your browser, with no upload and no sign-up.
How to convert a 3D file
- Drop your STL, OBJ, PLY, GLB, GLTF or 3MF file into the box.
- Pick the output format and, if needed, a scale (for example cm to mm).
- Click Convert & download. The new file is saved to your computer.
Supported conversions
- STL binary / ASCII — for slicers like Chitubox, Lychee, Cura, PrusaSlicer and Bambu Studio. Binary files are much smaller.
- OBJ — for Blender, ZBrush and most 3D software.
- PLY — common for 3D scans and mesh tools.
- GLB / GLTF — for web viewers, AR and game engines.
FAQ
Is the conversion private?
Yes. Everything happens in your browser — files are never uploaded to our server.
Why is my model too small or too big in the slicer?
The file was probably saved in a different unit. Use the scale option: x10 converts cm to mm and x25.4 converts inches to mm.
Will colors and textures be kept?
STL and PLY store geometry only. Converting to GLB or GLTF keeps basic materials from OBJ or GLB sources when available.
Want to preview a file first? Use our STL Viewer.