WAVESPEED AI STL TO 3MF Models stay on your device

100% FREE

Free STL to 3MF ConverterReady for your 3D printer.

Convert STL files to 3MF in your browser. Keep the exact size: 3MF stores millimetres.
Scaled in millimetres, upright on the build plate, with holes closed.

STL in, 3MF outPrint check & repairReal size in mm

No sign-up No upload Free downloads

Convert your 3D model to STL

Drop a model here, or choose a file

GLB, glTF, OBJ, FBX, PLY, STL or 3MF · Up to 300 MBNo model yet? Make one from a photo with AI

Or try a model made with AI

Converted in your browser. Your model is not uploaded.

MADE WITH AI 3D MODELS

Print a model made with AI.

Real outputs from the 3D models on WaveSpeed AI. Choose one to check it and download a print-ready STL.

Made with Hunyuan3D 3.1

Made with Meshy 7.1

THREE SIMPLE STEPS

How to use the STL to 3MF Converter

Add your STL file

Drop a .stl file. It opens in a 3D preview with its size and a print check.

Set size and orientation

Choose the height or longest side in millimetres and turn the model until it stands the right way up.

Download 3MF

Save the 3MF file. Other formats (STL, 3MF, OBJ, GLB) are one click away.

3D Model Converter 3MF to STL OBJ to STL STL to OBJ GLB to OBJ FBX to STL OBJ to GLB FBX to GLB All free tools

MORE WAYS TO CREATE

Make a model to convert.

Turn a photo or a sketch into a 3D model with WaveSpeed AI, then convert it here.

IMAGE → 3D

3D Generator

Make a 3D model from a photo or a prompt, with Tripo, Meshy, Hunyuan3D, Rodin and more.

Create a 3D model

IDEA → IMAGE

Image Generator

Design a figure or object as a picture first.

Create an image

IMAGE → MOTION

Video Generator

Show your model off in a short video.

Create a video

Generators have separate account and credit requirements. The converter is free.

STL to 3MF Converter FAQ

Is this STL to 3MF converter free?

Yes. Convert as many STL files as you like, with no account, subscription or watermark.

What is the difference between STL and 3MF?

STL stores only triangles: no colours, no units (slicers read the numbers as millimetres) and no scene. Every slicer and 3D printer accepts it. 3MF is a zipped XML package that records its units, so a part can’t come out 25 times too small. PrusaSlicer, Bambu Studio, OrcaSlicer and Cura save their projects in it.

Are colours and textures kept?

No. The converter writes the shape only. To print in colour, paint the model in your slicer.

Why does my model stand differently?

STL files build along Z, which the converter keeps. If it is lying down, switch the up axis or turn it 90°.

Is my file uploaded?

No. The model is read and converted in your browser and never leaves your device.