Viewer
Free online STEP file viewer
Open a STEP file in your browser and look at it properly: turn it round, cut sections through it, measure between faces and read off its size. It is free, needs no account and installs nothing. The file is never uploaded, because PartCheck reads it on your own computer.
When it is handy
- A supplier sent a STEP file and you have no CAD on this machine, or no licence for the format they work in.
- A quick look before a meeting, or on a colleague's laptop, without installing anything.
- A file you cannot upload. Customer parts under NDA stay on your computer: nothing is sent to a server.
- Checking a size or a gap without opening the whole CAD package for it.
How to use it
- 1
Open the file
Drop a .step or .stp file on the page, or click to choose one.
- 2
Look around
Drag to orbit, scroll to zoom, right-drag to pan. Fit brings the whole part back into view.
- 3
Cut, measure, read
Use the toolbar under the part: a section along X, Y or Z, three kinds of measurement, and the overall dimensions.
What you can do with the part
- Views
Front, back, top, bottom, left, right and isometric, or orbit freely. The model can also be turned in steps from the toolbar.
- Section
Cut the part along X, Y or Z, move the cut through it, and flip which side you keep, to see inside a housing or check a wall.
- Measure
Point to point, the length of an edge, or the distance between two faces.
- Dimensions
The part's overall size along each axis, drawn on the model.
- Outlines
The part's edges drawn over it, so its shape reads clearly from any angle.
More than a viewer
The same part, without opening it again, can be painted with its wall thickness, its draft, its corner radii or the sides a cutter reaches it from, or checked for injection molding or CNC machining. If you have two revisions, compare them to see what changed.
Questions
Which files does it open?
STEP files: .step and .stp. Meshes (STL), IGES and native CAD files are not read. Export the part as STEP from your CAD system first; every major one can.
Is my file uploaded?
No. The file is read in your browser and never leaves your computer. There is no account and nothing is stored.
Does it open assemblies?
Yes, as one model: every solid in the file is drawn together.
What do I need?
A current browser with WebGL 2, which on most computers means Chrome, Edge, Firefox or Safari. Very large files may be more than the browser's memory can hold.
Does it cost anything?
No. The viewer, the maps, the checks and the PDF reports are free.
Try it on a real part
The demo is a moulded enclosure lid in two revisions, drawn in CAD. It opens in the tool with no files needed, or you can open your own STEP files. Nothing is uploaded: the analysis runs in your browser.