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Slowly rotate the model around the vertical axis after loading for a full view. Can be toggled anytime in the left panel.
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Auto-rotate after loading
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STEP Viewer
No CAD installation needed. Open STEP/STP models instantly online and easily browse design details.
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About This Tool
STEP is a universal model exchange format in mechanical design, commonly used for parts and assemblies. This tool directly opens STEP files of various versions, smoothly previewing high-precision surfaces and assembly structures. It supports rotation, zoom, and pan, making it easy to quickly inspect the model's appearance and assembly relationships. Files are processed locally only and are never uploaded.
Tips
- 1Supports mainstream STEP/STP formats and versions
- 2Freely rotate and zoom to view internal structures
- 3Files are processed locally only and are not uploaded to servers
About Configuration Options
Preview settings
Animation
Clips
Number of animation clips stored in the file.
Bones
Number of skeleton bones used for rigging and skinning.
Format Information
Input format
- Full Name:
- STEP (Standard for the Exchange of Product Model Data)
- Type:
- CAD Model
- Format:
- STEP
- Tools:
- SolidWorks、Fusion 360、FreeCAD
- Open With:
- 3D Model Viewer、STEP Viewer
- Description:
- STEP (ISO 10303) is an international standard for CAD data exchange, preserving precise geometry with NURBS and solid modeling. Widely used in mechanical design and manufacturing, it retains parametric features and assembly structures, unlike mesh formats (STL/OBJ), enabling lossless transfer between CAD software. STEP suits engineering precision, not real-time rendering. Browsers and game engines require conversion to mesh. Recommended workflow: design in CAD, export STEP for archiving, then convert to STL/GLB for preview or printing. .stp and .step are identical variants.
Notes:
- CAD software required for editing parametric features
- Not suitable for real-time or web rendering
Supported Features:
- ISO-standard CAD exchange format
- Precise parametric surface modeling
- Widely supported by CAD/CAM/CAE software
- Suitable for engineering and manufacturing
How to Use
1
Load STEP CAD File
Open industrial STEP, STP, or AP203/AP214/AP242 assembly files.
2
Set Tessellation Quality
Adjust mesh deflection tolerance for smooth curves or faster viewport response.
3
Explore Part Tree
Toggle individual component visibility and inspect assembly hierarchy.
4
Section and Inspect
Apply interactive clipping planes to inspect internal mechanical geometry.
Frequently Asked Questions
View all FAQsQ
Can I expand a STEP assembly to view each part?
A
Yes. After opening the assembly, you can inspect each part layer by layer by rotating and zooming. However, currently it does not support individually hiding or disassembling parts, but the overall structure is clearly visible.
Q
What if a STEP file won't open or displays incorrectly?
A
Please make sure the file is complete and not corrupted. If it still doesn't work, try saving the file as AP214 or AP242 format using CAD software, then reopen it.
Q
Are STEP and STP the same thing?
A
Yes. STP is just a short extension for STEP; the content is identical. Whether you have a .step or .stp file, this tool can open it directly.
Q
Why does my STEP model have no color?
A
The STEP format mainly stores geometry and usually does not include color information. If you want to see a colored model, we recommend using formats with material support, such as glTF or OBJ.
Q
Can I view STEP files created in different CAD programs?
A
Yes. STEP is a neutral exchange standard, so files exported from SolidWorks, Fusion 360, Creo, CATIA, and other CAD tools open here directly.
Q
Can I convert a STEP file to STL or OBJ for 3D printing?
A
Yes. Use this site's STEP to STL tool or export from CAD software to convert the precise CAD surfaces into a mesh for printing. Preview the converted result here before slicing.
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