STL viewer

Drop a binary or ASCII .stl print file and inspect it before it hits the bed — parsed entirely in this tab.

Questions people ask

Why does my STL have no color?

STL stores triangles only — no color, no UVs, no materials, no scene. That minimalism is exactly why 3D printers and CNC machines read it. If you need color, the source model must come from a format like PLY or GLB.

Is this STL viewer good for checking prints?

It is built for that: orbit the model, zoom into overhangs and thin walls, and read the triangle count to gauge print complexity. Parsing is local, so even large bed-sized files stay on your machine.

ASCII or binary STL — does it matter?

Both describe the same triangles; binary is just far smaller. This viewer parses either one. Converting STL to any other format preserves pure geometry, since there is nothing else in the file to keep.