Are my 3D files uploaded to a server?

No. Every file is read, converted and written inside your own browser tab. Nothing is sent to a server, so your models never leave your computer.

Which 3D file formats can it read?

Mesh formats STL, OBJ, PLY, GLTF, GLB, 3MF, DAE and OFF, plus the CAD formats STEP, IGES and BREP, which are tessellated into a mesh on import.

Does the 3D file converter cost anything?

No. It is free with no account, no file size cap, no watermark and no export limit.

Why does it need a desktop?

It runs a live WebGL 3D viewport next to a WebAssembly CAD kernel. That combination needs a wide screen, a mouse for orbiting the model, and desktop-class memory, so it is not offered on phones or tablets.

3D File Converter — STL, OBJ, STEP, GLTF, GLB, PLY, 3MF

Q: Can it convert a mesh back into a STEP file?

No. It writes mesh formats only. Producing a STEP file from a mesh requires a solid modelling kernel that rebuilds exact surfaces, which is a different job than file conversion.

Free 3D file converter

Convert STL, OBJ, PLY, GLTF, GLB, 3MF, DAE, OFF, STEP, IGES and BREP files straight in your browser. No upload, no account, no watermark, no export cap. Every file is read and written on your own machine, so your models never leave your computer.

This one needs a desktop. It runs a live 3D viewport next to a CAD kernel, which wants a wide screen, a mouse to orbit the model, and desktop-class memory. Open this page on a laptop or desktop and the full tool loads.

Reads

STLOBJPLYGLTFGLB 3MFDAEOFFSTEPIGESBREP

Writes

STLOBJPLY GLBglTF3MF DAEOFFUSDZ

What it does

Mesh conversion. Move between STL, OBJ, PLY, GLB, glTF, 3MF, DAE, OFF and USDZ, keeping materials and textures where the target format supports them.
CAD tessellation. STEP, IGES and BREP store exact surfaces. The built-in kernel samples them into a mesh, at four quality levels from draft to very fine.
Live preview. Inspect the model in a real 3D viewport before you convert, with shaded, material and wireframe views.
Units and scale. Convert between millimeters, centimeters, meters, inches and feet, or apply your own scale factor.
Geometry cleanup. Center on origin, drop to the ground plane, weld duplicate vertices, recompute normals, flip faces, merge objects.
Batch conversion. Load a pile of files, convert them all at once, and download the lot as a single .zip.

Questions

Are my files uploaded anywhere?

No. There is no server in the loop. Files are read, converted and written inside your browser tab, which is why the tool keeps working with your network off.

Can it convert a mesh back into a STEP file?

No. It writes mesh formats only. Turning a mesh back into a STEP file means rebuilding exact surfaces, which needs a solid modelling kernel rather than a file writer.

Is there a file size limit?

Only whatever your own machine can hold. Nothing is capped by us.

What does it cost?

Nothing. No account, no trial, no watermark on the output. That is the whole point of the site.

← See the other free tools

Input

Drop 3D files

or click to browse · batch is fine
drop an .mtl or texture in with an .obj

Nothing loaded yet.

CAD tessellationkernel idle

Curve quality

STEP, IGES and BREP store exact surfaces. Converting to a mesh samples them — finer settings follow curves more closely and cost triangles. Changing this re-reads any CAD already loaded.

Reads

Reads — CAD (tessellated)

Writes mesh formats only. Producing a STEP from a mesh would need a solid-modelling kernel, not a file writer.

Empty bench

Load a model to inspect it, then convert. Or try one of these:

Convert to

Encoding & scale

File encoding

Units, from → to

Extra scale

Up axis

Geometry Center on origin Drop to ground plane Weld duplicate vertices Recompute normals Flip faces Merge objects into one

Offset X / Y / Z

Rotate X / Y / Z°