STP to STL File Converter: Free & Online

Convert single parts or full assemblies from .STP to .STL (Stereolithography) file format and prepare 3D models for printing in one app.

Trusted by 10,000+ engineers
No Limits
Automatic Mesh Repair
SSL & Auto-Delete
Video coming soon

Read our step-by-step guide:

Which STP to STL Converter Is Best for You?

Compare STP to STL converters and find the best fit for your workflow.

MeshInspector App
MeshInspector Web
Other Converters
Speed
Ultra-fast Local processing
Fast
Slow
File Size Limits
Unlimited
Unlimited
File size limit (50 MB)
File Number Limits
Unlimited
Unlimited
Usually single file only
Folder Support
Full folder import
Full folder import
Not supported
Assembly Conversion
Partial or full assembly
Partial or full assembly
Not supported
Mesh Validation
Integrated
Integrated
Not supported
Auto Mesh Repair
Advanced
Advanced
Not supported
Mesh Repair Options
Advanced
Advanced
Not supported
Accuracy Control
Full
Full
Not supported
3D Viewer
Advanced
Advanced
Basic or no preview
3D Editor
Advanced
Advanced
Not supported
Security & Privacy
100% Local No upload needed
SSL + Auto-delete
Files often stored on servers
Cross-Platform
Windows, macOS, Linux
All devices
Web only, limited mobile UX
Suitable for
Professionals and engineers
Quick online conversions
Not recommended

Ready to Convert Your STP Files?

Join thousands of engineers who trust MeshInspector for their 3D file conversion needs. Start converting today with no limits and professional results.

How to Convert STP to STL with MeshInspector Software

When it comes to 3D data workflows, MeshInspector makes STP-to-STL conversion fast, reliable, and effortless. Use MeshInspector to convert and export an STP file to STL without losing accuracy or detail.

1

Opening STP files

To kick off the successful conversion process, open the MeshInspector program. Your next stop is ‘Open Files,’ just as highlighted in the screenshot below.

MeshInspector interface showing how to open an STP file for STL conversion
2

Browsing STP files

Our advanced program will instantly offer you to find the file needed. Click on ‘Browse’ and go ahead. You find your .stp thing and double-click on it.

Browsing and selecting STP files using MeshInspector’s file explorer
3

Viewing STP Files

You can see your object of interest, ready for conversion from an STP file to STL. We accept STP files with multiple parts in them, as well as entire heavy archives.

3D model preview of an STP file in MeshInspector
4

Exporting Components

If your intention is to export a specific element as an individual file, no problem. Simply select it in the Scene Tree and then click on ’Export.’ The program will save only the chosen component.

Exporting a single component from an STP file in MeshInspector
5

Combining for Export

Want to change all the elements found in the file? In ‘Scene Tree,’ choose all you need in a group, then click on ‘Combine Subtree.’ They will be united. Repeat the same operation with ‘Export’.

Combining multiple STP components for unified export
6

Setting the STL format

After you do so, you will see a dropdown list of extensions to choose from. Note that the STL for conversion here is binary. Also, you can change the name of the element.

Saving an STL file and selecting binary format in MeshInspector
7

Inspecting the STL Size

Understandably, you might want to verify that the resulting STL model actually fits the dimensions of your printer, as they differ. For this purpose, find ‘Inspect.’ Under it, your destination is ‘Bounding Box.’ Once clicked, it will visualize the dimensions of the result of your conversion from an STP file to the STL format.

Inspecting STL file dimensions and bounding box in MeshInspector
8

Adjusting the STL Size

Say, your next step is to modify the size and the volume of your STL file after the successful conversion from an STP file to the STL format. Drag our scaling bar to change the size. Once you finalize your manipulation, never forget to click the highlighted checkbox to save your alterations. The size and volume will change accordingly.

Adjusting STL scale and size in MeshInspector
9

Finding ‘Mesh Healer’

Another dimension to explore is our ‘Mesh Healer.’ Keep the object selected, go to ‘Mesh Repair.’ Your next stop is ‘Mesh Healer.’ This step is a must to make sure the 3D printing round will be productive.

Running Mesh Healer tool in MeshInspector for model repair
10

Fixing the STL

After clicking on ‘Mesh Healer,’ you will be able to choose between ‘Local’ and ‘Auto’ approach to mesh healing to either address individual issue types or to rebuild the entire mesh.

Applying mesh repair options in MeshInspector

User Testimonials

4.9/5
out of 5 based on 2,547 reviews

Gabriele Impellizzeri

R&D Manager

MeshInspector significantly helped us in streamlining all of our 3D printing mesh modeling tasks thanks to its ability to fix, smoothly decimate and operate on our large-size lattice meshes in a fast and effective way.

Erick Geisler

Chief Technical Officer

"MeshInspector has completely transformed our workflow. It\'s faster, more efficient, and offers incredible value. The responsiveness of the development team and the quality of the software have given us a significant edge over our competitors."

Peter Sekula

Chief of Operations | Matterfield

"MeshInspector proves invaluable for 3D artists with its swift decimation and powerful Python API, streamlining workflows and enhancing efficiency. Its automation capabilities render it indispensable in the realms of gaming and VFX."

Daniel Gelep

3D Scanning Representative, Susteni AS

"It's the fastest program I\'ve used so far, and I can now do 150 scans in just 2 days instead of 1.5 weeks."

Ruedger Rubbert

Chief Technology Officer, Brius Technologies Inc

"With MeshInspector MeshLib we were able to automate many of our workflow processes, thanks to its advanced, modern, and efficient dental and geometry oriented algorithms, covering many of our orthodontic-related tasks: CT and intraoral scan segmentation, voxel and Boolean operations, editing, aligning, visualization, inspection, and import/export of mesh objects. We use the versatile MeshInspector MeshLib API, both in production and R&D for fast prototyping and testing of our ideas."

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