How to Open SLDPRT Files Without SolidWorks
Working with a .SLDPRT file but don’t have a SolidWorks license? You’re not alone.
Many manufacturers, engineers, procurement teams, and product designers receive SolidWorks part files from clients or vendors but may not have access to SolidWorks software. Fortunately, there are several ways to open and review SLDPRT files without purchasing an expensive CAD license.
In this guide, we’ll cover the best free and professional methods to open SLDPRT files efficiently.
What Is an SLDPRT File?
An SLDPRT file is a native 3D part file created using SolidWorks CAD software. These files contain:
- 3D geometry
- Parametric design data
- Material information
- Dimensions and features
SLDPRT files are commonly used in:
- Mechanical engineering
- Product development
- Manufacturing
- 3D printing
- Industrial design
Why Open SLDPRT Files Without SolidWorks?
There are many practical reasons:
- Avoid expensive SolidWorks licensing costs
- Quickly review supplier or client files
- Open models for manufacturing review
- Convert files into STEP, STL, or IGES formats
- Use files for quoting or prototyping
Best Ways to Open SLDPRT Files Without SolidWorks
1. Use FreeCAD (Best Free Option)
FreeCAD is one of the most popular free CAD programs capable of opening many SolidWorks files.
Advantages:
- Free and open-source
- Supports STEP, IGES, STL, and some SLDPRT imports
- Good for basic viewing and conversion
Best For:
- Engineers
- Students
- Hobbyists
- Small manufacturers
⚠️ Note: Complex or newer SolidWorks files may not import perfectly due to proprietary SolidWorks features.
2. Convert SLDPRT to STEP File
One of the easiest methods is converting the SLDPRT file into a neutral CAD format like .STEP.
STEP files:
- Open in almost all CAD software
- Preserve 3D geometry
- Are widely used in manufacturing workflows
Popular formats:
- STEP (.step / .stp)
- IGES (.igs)
- STL (.stl)
Recommended for:
- CNC machining
- 3D printing
- Vendor collaboration
- CAD interoperability
3. Use Online CAD Viewers
Several browser-based CAD viewers allow you to upload and preview SLDPRT files online.
Benefits:
- No installation required
- Fast preview access
- Useful for quick design reviews
Limitations:
- File size restrictions
- Security/privacy concerns for confidential designs
- Limited editing capabilities
4. Request STEP or Parasolid Files from Supplier
If you frequently receive SolidWorks files but don’t use SolidWorks internally, ask vendors to send:
- STEP files
- Parasolid (.x_t)
- IGES files
These formats are much easier to work with across multiple CAD platforms.
Common Problems Opening SLDPRT Files
File Version Compatibility
Older software versions may not open newer SolidWorks files.
Missing Assemblies or References
Sometimes associated assembly files (.SLDASM) are required.
Corrupted File Imports
Incomplete transfers or incompatible conversions can damage geometry.
Best Software Alternatives to SolidWorks
| Software | Best Use | Cost |
|---|---|---|
| FreeCAD | Free CAD viewing & editing | Free |
| Fusion 360 | Product design & collaboration | Paid |
| eDrawings | SolidWorks file viewing | Free/Paid |
| Autodesk Viewer | Browser-based viewing | Free |
| Onshape | Cloud CAD collaboration | Paid |
Check out our:
Professional CAD Conversion Services
For complex files or production-critical projects, professional CAD conversion services may be the safest solution.
At ALOR CAD Services, we help:
- Convert SLDPRT to STEP, IGES, STL, and DWG
- Repair corrupted geometry
- Prepare models for manufacturing
- Support U.S.-based engineering teams with fast turnaround
✅ U.S.-wide support
✅ 24–48 hour turnaround
✅ NDA-friendly workflow
📩 Contact us for secure CAD conversion support.
FAQ – Opening SLDPRT Files
Can FreeCAD open all SLDPRT files?
Not always. Complex or newer SolidWorks models may have import limitations.
What is the best format to convert SLDPRT into?
STEP format is usually the best option for compatibility.
Can I open SLDPRT files online?
Yes, several browser-based CAD viewers support SLDPRT uploads.
Is there a completely free SolidWorks viewer?
eDrawings Viewer and FreeCAD are among the most common free options.
Final Thoughts
You don’t necessarily need a full SolidWorks license just to open or review SLDPRT files.
Whether you use:
- FreeCAD
- STEP conversion
- Online CAD viewers
- Professional CAD conversion services
…there are multiple cost-effective ways to access your CAD data efficiently.
For manufacturers and engineering teams handling complex models regularly, converting files into neutral formats like STEP often provides the most reliable long-term workflow.
