Convert 3D files online

Free converter for STL, OBJ, PLY, GLB/glTF, 3MF, and STEP. Pick an output format, convert in your browser, and keep your files on your device.

Convert the attached model to STL (binary)

Files are processed entirely in your browser. Nothing is uploaded to a server.

Any 3D edit is just a prompt away.
Try the full chat free

Supported conversions

Input: STL, OBJ, PLY, GLB/glTF, 3MF, and STEP (.step / .stp). Output: binary STL for 3D printing, OBJ for Blender and other DCC tools, PLY for scanning pipelines, or GLB for the web and game engines. Everything is processed locally in your browser, so nothing gets uploaded.

Multi-part files are merged into a single mesh. Materials and textures are dropped, because the pipeline works on plain geometry.

All conversion paths

Frequently asked questions

Can I convert STL to STEP here?

Not yet. STL is a triangle soup while STEP describes exact CAD surfaces, so a faithful conversion needs real surface reconstruction. If you need a parametric CAD model, describe the part in GrandpaCAD chat and it will generate clean CAD geometry you can export.

Why did my textures disappear?

STL and PLY (as exported here) only store geometry. If you need colors and materials preserved, keep the original textures in your source tool and re-apply them after conversion.

Is there a file size limit?

Files up to 150 MB are supported. For bigger files, run the reduce tool first: decimate, then convert.

More free 3D file tools

Repair a model Reduce file size Measure a model Scale a model Split a model Mirror a model Print weight & cost

Ready to take your 3D modeling to the next level?

Create complex 3D models in seconds using our AI-powered generator. No CAD experience required.

Try GrandpaCAD for Free

Back to Tools