STL Viewer: Free & Online

Open, measure distances and volume, and resize STL files for 3D printing - all in one app.

Trusted by 10,000+ engineers
No Limits
Built-in Editor
SSL & Auto-Delete

Watch our quick tutorial or read:

Which STL Viewer Is Best for You?

Compare popular STL viewers to find the best one for your 3D workflow.

MeshInspector
MeshInspector
Other STL Readers
Perfomance
Ultra-fast (GPU acceleration)
High
Slow
Batch Import
Unlimited
Unlimited
Single file
File Limits
Unlimited
Unlimited
~100 MB
Measurement Tools
Advanced
Advanced
Limited
Metadata Support
Full
Full
Not supported
Scaling
Advanced
Advanced
Not supported
3D Editor
Advanced
Advanced
Not supported
Screenshots
Advanced
Advanced
Limited
Supported Files
STL (ASCII/Binary), OBJ, PLY, GLTF
STL (ASCII/Binary), OBJ, PLY, GLTF
STL (Binary)
Export
Multiple formats
Multiple formats
Not supported
Security & Privacy
Corporate security + Local storage
SSL + Auto-delete
Server-side storage
Cross-Platform
Windows, macOS, Linux
All devices
Web only, poor mobile UX
Suitable for
Professional & industrial use
Quick viewing & sharing
Not recommended

Ready to get started with MeshInspector?

Join a global community of engineers using MeshInspector for high-precision measurement, inspection, and advanced 3D analysis.

How to Open STL Files on Windows, Mac & Linux

When working with 3D models, engineers and designers often need a dependable program to read STL files. The intention is to open and inspect geometries swiftly and with precision. MeshInspector provides a free and cross-platform solution. Available both online and offline under our trial plan, it enables you to view, examine, and repair 3D models on Windows, macOS, and Linux. It accepts both binary and ASCII STL formats, which is a match when you seek full compatibility with any workflow.

1

Opening your STL

In the ’Home’ section, click on ’Open Files’ to initiate the viewing process. The MeshInspector program for 3D data allows to do so for any STL, regardless of its complexity, scale, and size.

2

Browsing your STL

Browse to the STL’s location, then double-click the file or press ‘Upload.’ MeshInspector can recognize entire folders and zipped archives, not just individual compact files. It is great for convenience.

3

Previewing your STL

After import, one is free to preview their STL from any angle. For rotating, hold the left mouse button or slide one finger on your touchpad. For panning, hold the right mouse button or slide two fingers. For zooming, scroll the mouse wheel or pinch on the touchpad. For tilting, hold Ctrl and drag with the left button.

4

Checking the STL Size

To quickly inspect the size of your model in an STL file, activate ‘Bounding Box’ under the ‘Inspect’ tab to view the STL model’s dimensions and volume. They will be displayed with precise accuracy for greater efficiency and convenience.

5

Changing the STL Size

Resize the STL using the scaling bar under ‘Transform’ in the lower-left corner if needed. We handle models of any size. Do not forget to finalize the process by clicking the checkmark. You will see how the model’s volume changes accordingly, as well.

6

Inspecting the STL Quality

A powerful and fully dependable program for reading STL files should do more than just display geometry. The MeshInspector program fully rises to the occasion in this regard. In ’Mesh Repair,’ open ’Mesh Healer’ to verify the quality of the STL you are viewing.

7

Fixing Issues in STLs

‘Local Repair’ detects disconnected parts, holes, self-intersections, etc. For printability, you can enable ‘Thin walls’ and ‘Undercuts.’ Select which issues to analyze using checkboxes and then run the repair with a single click. ‘Auto Repair,’ when chosen, will repair the model by totally rebuilding it.

8

Distance Measurements in your STLs

For distance measurements, open ‘Features’ and activate ‘Measure Distance.’ Then click on points on the surface. The MeshInspector tool can calculate 3D distances as well as X, Y, and Z projections, which is great when you need to thoroughly review an STL file.

Open-Source STL Viewer for Developers

Integrate real-time 3D visualization, mesh analysis, and measurement tools directly into your applications with MeshLib SDK.

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