Assista

    Free 3D viewer

    Free Online STL, STEP & 3MF Viewer

    View 3D models in your browser — no signup, no download. Your files never leave your device.

    Drop or browse for an .stl, .3mf, .step, or .stp fileRendered entirely in your browser — nothing is uploaded.

    Need this part printed? Get an instant local quote — no waiting on email quotes.

    Get an instant quote & pick it up from a local maker

    Questions

    What is an STL file?
    An STL is the most common 3D-printing file format. It stores a model as a mesh of triangles that describe its surface. STEP and 3MF are other common formats — this viewer opens all three.
    Is this viewer free?
    Yes. It's completely free, with no signup, no account, and no download. Just drop in a file and look at it in 3D right in your browser.
    Do you store my files?
    No — everything runs locally in your browser. Your file is read and rendered on your own device and is never uploaded to any server. Close the tab and it's gone.
    What file types can I view?
    STL, STEP (.step / .stp), and 3MF. If a 3MF was exported by some slicers in an unusual format it may not preview; exporting it as STL always works.