Need a fast, easy way to view your 3D STEP and STL files online? Our free viewer lets you open, inspect, and analyze your files instantly — no downloads or installations required. Whether you’re a designer, engineer, or hobbyist, you can upload your CAD files and view them in your browser in seconds.
View STEP (.stp, .step) and STL files instantly online
No software download or installation needed
Secure – your files stay private and are not saved
Zoom, rotate, pan, and inspect your 3D models
Quickly get STEP or STL file dimensions and volumes
Supports drag-and-drop uploads
Click Upload or Drag and Drop your STEP or STL file.
View and inspect your 3D model directly in your browser.
Zoom, rotate, and pan to explore every detail.
What is a STEP file?
A STEP file (.step or .stp) is a 3D CAD file format used for exchanging models between different CAD (Computer-Aided Design) programs. STEP stands for Standard for the Exchange of Product Data (ISO 10303).
It’s one of the most widely used formats for 3D modeling because it preserves detailed information about the geometry, tolerances, and materials of a part or assembly. Engineers, manufacturers, and product designers often share STEP files when collaborating across different software platforms like SolidWorks, CATIA, Siemens NX, or AutoCAD.
What is a STL file?
An STL file (.stl) is a 3D model format widely used for 3D printing and rapid prototyping. STL stands for Stereolithography, the first commercial 3D printing technology.
An STL file describes only the surface geometry of a 3D object using a mesh of triangles, without any information about color, texture, or material properties.
Is it safe to upload my files?
Yes! Your files are opened directly in your browser. We do not store or access your uploads.
Do I need to create an account?
No account is required. Just upload and view STEP and STL files right inside of your browser.
Are there file size limits?
We recommend uploading files up to 100 MB for best performance.