.stl — Stereolithography 3D Model
A simple 3D model format describing surface geometry as triangles, the de facto standard for 3D printing.
Safety guidance (not a guarantee)
Plain documents are generally low-risk to view. If the format supports macros or embedded scripts, keep them disabled unless you specifically expect and trust them.
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Frequently asked questions
What is a .stl file?
A simple 3D model format describing surface geometry as triangles, the de facto standard for 3D printing.
Can I edit a .stl file?
Yes — .stl files are commonly editable with software such as Blender.
Does having a .stl extension mean the file is safe?
No single extension can guarantee that. Plain documents are generally low-risk to view. If the format supports macros or embedded scripts, keep them disabled unless you specifically expect and trust them. Always consider where the file came from, not just its name.
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