WAVESPEED AI STEP TO STL Models stay on your device

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Free STEP to STL ConverterFrom CAD to your 3D printer.

Convert STEP (.step, .stp) and IGES files from SolidWorks, Fusion, Onshape or FreeCAD to STL in your browser.
Real size in millimetres, every part of the assembly, with the detail you choose.

STEP & IGES in, STL outReal size in mmNo CAD software needed

No sign-up No upload Free downloads

Convert your 3D model to STL

Drop a model here, or choose a file

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

Or try a model made with AI

Create 3D models with AITurn a photo or a prompt into a 3D model, then view it, convert it or get it ready to print here.

Open AI 3D Generator

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 STEP to STL Converter

Add your STEP file

Drop a .step or .stp file (or IGES). It opens on the build plate at its real size, with a print check.

Choose the detail

Standard suits most prints. Fine or Extra fine make small holes and curves rounder. Turn the part to the side it should print on.

Download STL

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

WaveSpeed AI

Make something to print.

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

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Pay as you go

$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The converter is free.

STEP to STL Converter FAQ

Is this STEP to STL converter free?

Yes. Convert as many STEP files as you like, with no account, subscription, watermark or file count limit.

What is the difference between STEP and STL?

STEP stores the exact shape a CAD program made: true circles, curved surfaces, separate parts, names, colours and units. STL stores only triangles. The converter turns the exact surfaces into triangles that follow them closely enough to print.

Will the size be right?

Yes. STEP files record their units, so the part keeps its real size in millimetres, even if it was saved in inches. A 100 × 50 × 20 mm block reads 100 × 50 × 20 mm. You can still scale it in the size setting.

What does the detail setting do?

It sets how closely the triangles follow curves. Standard is fine for most prints. Fine and Extra fine give rounder holes, fillets and threads, and a bigger STL that takes longer to convert.

Can I convert an assembly?

Yes. Every part in the STEP file is included in one STL, in place. To print parts separately, export them one at a time from your CAD program.

Which CAD files work?

STEP (AP203, AP214 and AP242, .step or .stp), IGES (.iges, .igs) and OpenCascade BREP, up to 300 MB. Native files such as .sldprt, .f3d or .ipt need to be exported as STEP first.

Is my file uploaded?

No. The file is converted in your browser and never leaves your device, so it’s safe for confidential designs.

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