STEP Viewer: view STEP and STP files online
Open a .step or .stp file in your browser and look at the part: rotate and zoom it, read its dimensions, slice a cross-section through it, and measure between any two points. No CAD package, no install and no signup.
Drag & drop files here or Browse
Auto-detects CAD, Video, PDF, and 200+ formats
How viewing a STEP file works
A STEP file stores geometry as mathematical surfaces, which is why CAD packages can edit it and why a browser cannot draw it. To show you the part, the file is uploaded and FreeCAD's OpenCASCADE kernel tessellates those surfaces into triangles, and that mesh is what appears above. It is the same step a slicer performs before printing.
That is a real difference from our STL viewer, which never uploads anything because a browser can read STL directly. If the part is confidential, that distinction is the one to weigh. Files here are deleted within 24 hours.
What you can do with the model
Drag to rotate, scroll to zoom, right-drag to pan. The panel gives you standard Iso, Top, Front and Right views, model and background colours, and a switch between millimetres, centimetres and inches. Cross-section cuts the part along any axis so you can check a wall thickness or find an internal cavity, and point to point measurement gives the distance between any two places you click. The readouts cover bounding box, triangle count, surface area and enclosed volume.
If you want to keep the mesh rather than just look at it, the STEP to STL converter returns the same tessellation as a file. For background on the format itself, see what is a STEP file.