Yuki Sato
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STEP to OBJ Converter: Free & Online
Convert single parts or full assemblies from .STEP to .OBJ file format and prepare 3D models for printing in one app.
- Free account
- No install
STEP files are converted to a mesh on a MeshInspector server, so the web app asks you to sign in. A free account is enough.
How to convert STEP to OBJ
Open the web app
Click Open in web app and sign in or create a free account. The web app needs it to convert STEP files on a MeshInspector server.
Open your .step file
Click Open Files and pick the file. MeshInspector turns the CAD surfaces into a triangle mesh.
Export as .obj
Click Export, choose .obj in the Extension list and click Save. The file downloads to your computer.
In the desktop app
- Install and sign in. Download MeshInspector for Windows, macOS or Linux and sign in. The free Community plan is enough.
- Open the file. Click Open Files and pick the .step file.
- Export. Select the model, click Export and choose .obj.
- Save. Pick a folder and save the .obj file.
What to know about STEP → OBJ
- STEP describes exact CAD geometry (surfaces and solids), not triangles: converting it to a mesh approximates curved faces with triangles.
- OBJ is a text format; its materials and textures live in a separate .mtl file and image files.
- MeshInspector opens STEP and exports the mesh it makes from it; in the web app STEP needs a free account.
- MeshInspector opens STEP files but does not save them: STEP is import only.
- OBJ stores no units, like STL.
Online or desktop
Online
The MeshInspector web app opens STEP files after you sign in with a free account. No install is needed.
Desktop
The desktop app runs on Windows, macOS (Apple silicon) and Linux. Use it for large files, many files, and the tools the web app does not have. The free Community plan covers opening and exporting; see Pricing for what the paid plans add.
FAQ
Do I need an account to convert STEP to OBJ?
Yes, a free one. A .step file is converted to a mesh on a MeshInspector server, so the web app asks you to sign in; the free Community plan is enough. Then click Open Files, pick the file, click Export, choose .obj and save it.
Is the STEP to OBJ converter free?
Yes. Opening STEP files and exporting the mesh as .obj are part of the free Community plan, in the web app and in the desktop app. Paid plans add tools such as Mesh Healer and automatic repair; the Pricing page lists what each plan includes.
Is my STEP file uploaded?
Yes. To turn the CAD surfaces into a mesh, the web app sends the .step file to a MeshInspector conversion service, as the Privacy Policy describes. Mesh files such as STL, OBJ, PLY and 3MF are opened in your browser instead.
Are colors and units kept?
OBJ stores no units, so check the size of the model after conversion. Colors and textures in OBJ live in a separate .mtl file and image files; the exported OBJ carries the mesh geometry, so check the result in your target app if you rely on materials or textures.
Is there a file size limit?
There is no fixed limit, but the web app works within your browser's memory: up to about 4 GB, or 16 GB in browsers with 64-bit WebAssembly. For large assemblies, or many files, use the desktop app for Windows, macOS or Linux.
Free Community planWindows, macOS (Apple silicon) and Linux
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By Mesh Inspector TeamPublished: Updated:
