STP File Viewer Online
Open STP and STEP files in the MeshInspector web app with a free account: turn the part in 3D, measure it, cut a section and export it as STL.
- Free account
- No install
STEP and STP files are converted to a mesh on a MeshInspector server, so the web app asks you to sign in. A free account is enough.
What you can do with your STP file
Open STEP and STP files
Sign in to the MeshInspector web app with a free account and open .step or .stp files. A MeshInspector server converts them to a mesh.
Rotate, zoom and pan
Turn the part with the mouse or touchpad and zoom in on any detail.
Measure the part
Measure distances between points and angles between edges, and see the overall size with Bounding Box.
Cut a section
Section cuts the part with a plane, so you can look inside it.
Convert STEP to STL
Export the converted mesh as STL, OBJ or 3MF in the web app or the desktop app. The converter pages below show how.
How to open an STP file in 3 steps
Sign in for free
Open the MeshInspector web app and sign in or create a free account. STEP files need it: they are converted to a mesh on a MeshInspector server.
Open your STP file
Click Open Files and pick your .stp file. The server converts it to a mesh, uses the file only for the conversion and does not keep it.
View, measure, export
Turn and zoom the part, measure distances and angles, or cut a section. Export saves the mesh, for example as STL, OBJ or 3MF.
STP viewer FAQ
How do I open an STP file online?
Open the MeshInspector web app and sign in; a free account is enough. Click Open Files and pick your .stp or .step file. A MeshInspector server converts it to a mesh, and the part appears in 3D. The file is used only for the conversion and is not kept after it.
Why does the STP viewer need an account?
STEP and STP files describe exact CAD surfaces. Before the web app can show a part, a MeshInspector server converts it to a triangle mesh, and that service works for signed-in users. A free account is enough. Mesh files such as STL and OBJ open without any account in our other online viewers.
What is the difference between STP and STEP files?
None: .stp and .step are two extensions of the same format, STEP (ISO 10303). CAD programs export it to exchange parts and assemblies between different systems. The content is identical, so a STEP viewer opens both, and MeshInspector treats .stp and .step files exactly the same way.
How do I convert STP to STL?
Open the .stp file in the MeshInspector web app with a free account, or in the desktop app. Click Export and choose .stl in the list of extensions, then save the file. OBJ and 3MF work the same way. The STP to STL converter page linked below shows each step.
How do I rotate and zoom a STEP model?
Drag with the left mouse button to rotate the part, scroll the wheel to zoom and drag with the right button to pan. On a touchpad, slide one finger to rotate, two fingers to pan and pinch to zoom. The View Settings tab has Front, Top and Isometric views.
Add an STP Viewer to Your App
- Multi-Format Support — meshes, point clouds, voxels, and line data
Modern UI — built with Dear ImGui: ribbon interface, scene tree, view cube, and measurement tools.
Order-Independent Transparency (OIT) — realistic rendering of transparent materials.
Customizable Interaction — support for mouse, keyboard, touch gestures, and SpaceMouse devices.
Plugin Architecture — extend the Viewer with your own tools and workflows.
