Free online STEP to 3DM converter
How to convert STEP files to 3DM format using Rhino and other recommended tools.
Convert STEP to 3DM online - free
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Import a file from a URL
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How it works
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Upload your .step file
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Perform .step to .3dm conversion
After successful file upload, click to convert when you are ready.
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Download converted .3dm file
Conversion result is ready to download.
Conversion statistics: STEP to 3DM
Updated November 10, 2026, from conversions on 101convert.com
How to convert step to 3dm file
- 3D modeling
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1yr
Understanding STEP and 3DM file formats
STEP (Standard for the Exchange of Product Data, .step or .stp) is a widely used neutral CAD file format for 3D models, supporting interoperability between different CAD software. 3DM (Rhinoceros 3D Model, .3dm) is the native file format for Rhinoceros (Rhino), a popular 3D modeling application, especially in architecture, industrial design, and jewelry.
Why convert STEP to 3DM?
Converting a STEP file to 3DM allows you to edit and enhance 3D models in Rhino, leveraging its advanced modeling tools and compatibility with plugins.
Best software for STEP to 3DM conversion
The most reliable way to convert STEP to 3DM is by using Rhinoceros (Rhino). Rhino natively supports importing STEP files and saving them as 3DM.
How to convert STEP to 3DM using Rhino
- Open Rhinoceros (Rhino) on your computer.
- Go to File → Import and select your .step or .stp file.
- Click Open to import the STEP file into Rhino.
- Once the model loads, go to File → Save As.
- Choose 3DM (*.3dm) as the file type and select your desired location.
- Click Save to complete the conversion.
Alternative converters
Other software options include:
- Autodesk Fusion 360: Import STEP, then export as 3DM (requires plugin).
- Online converters: Some web-based tools offer STEP to 3DM conversion, but may have file size or privacy limitations.
Tips for successful conversion
- Check geometry after import for any errors or missing elements.
- Use the latest version of Rhino for best compatibility.
- For complex assemblies, consider splitting the STEP file before conversion.
Note: This step to 3dm conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.
STEP vs 3DM: format comparison
How the STEP and 3DM formats compare on the properties that matter most for this conversion.
| Property | .STEP Standard for the Exchange of Product model data | .3DM Rhinoceros 3D Model |
|---|---|---|
| Open standard | Yes | Partly open |
| Compression | Uncompressed | Uncompressed |
| Typical file size | Medium | Large |
| Opens in a web browser | No | No |
| Further editing | Limited | Easy |
| Metadata support | Extensive | Extensive |
| Plain-text readable | Yes | No |
| Best used for | Data exchange | Professional production |
| Introduced | 1994 | 1998 |
| Developer | ISO | Robert McNeel & Associates |
| MIME type | application/step | model/vnd.3dm |
Information about file extensions and file types is provided by File-Extensions.org
Suggested software and links: step to 3dm converters
Frequently asked questions
Is the STEP to 3DM converter free?
Yes, converting STEP to 3DM on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.
How large can my STEP file be?
You can upload STEP files up to 10 MB and convert up to 3 files at once in a single batch. With a paid plan the limit is up to 500 MB per file and 10 files at once, see our plans.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert STEP to 3DM?
No. The STEP to 3DM conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid STEP file for this STEP to 3DM conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.
Additional formats for
step file conversion
- step to skp
- step to jpg
- step to max
- step to bip
- step to sldprt
- step to pdf
- step to glb
- step to catpart
- step to c4d
- step to mb
- step to 3dp
- step to 3ds
- step to 3dxml
- step to bmp
- step to dae
- step to eprt
- step to fbx
- step to geo
- step to gif
- step to iam
- step to ipt
- step to iv
- step to jpeg
- step to jt
- step to lwo
- step to m3g
- step to ma
- step to mdl
- step to off
- step to png
- step to pts
- step to sat
- step to scn
- step to sldasm
- step to tif
- step to tiff
- step to u3d
- step to vrl
- step to vrml
- step to webp
- step to x
- step to x3d
- step to x_b
- step to x_t
- step to xml
Reverse conversion
Convert to 3dm from
other formats
- dwg to 3dm
- max to 3dm
- sldprt to 3dm
- stp to 3dm
- obj to 3dm
- ipt to 3dm
- sat to 3dm
- 3ds to 3dm
- pdf to 3dm
- x_t to 3dm
- 3dc to 3dm
- 3df to 3dm
- 3dmf to 3dm
- 3mf to 3dm
- asc to 3dm
- c4d to 3dm
- catpart to 3dm
- dae to 3dm
- dwf to 3dm
- dxf to 3dm
- eps to 3dm
- fbx to 3dm
- glb to 3dm
- gltf to 3dm
- iam to 3dm
- iges to 3dm
- igs to 3dm
- image to 3dm
- jpeg to 3dm
- jpg to 3dm
- jt to 3dm
- kmz to 3dm
- lxo to 3dm
- ma to 3dm
- mb to 3dm
- mf1 to 3dm
- pic to 3dm
- ply to 3dm
- png to 3dm
- prt to 3dm
- skp to 3dm
- sldasm to 3dm
- stl to 3dm
- tga to 3dm
- tif to 3dm
- tiff to 3dm
- vrl to 3dm
- vrml to 3dm
- wrl to 3dm
- ws to 3dm
- x3d to 3dm
- x_b to 3dm