View STL files instantly in your browser with our free online STL viewer. No downloads or sign-up required. Drag and drop to start viewing STL models online.
STL (Stereolithography) is the most widely used file format for 3D printing and rapid prototyping. Developed by 3D Systems in 1987, STL files describe the surface geometry of a three-dimensional object using a mesh of triangular facets. Each triangle is defined by its three vertices and a unit normal vector, which together approximate the shape of the original CAD model.
STL files come in two variants: ASCII and binary. ASCII STL files are human-readable but significantly larger, while binary STL files are compact and load faster, making them the preferred choice for most applications. The format stores only geometry data without color, texture, or material information, which keeps the file structure simple and universally compatible.
Because of its simplicity and widespread adoption, virtually every 3D printing slicer, CAD application, and online printing service supports the STL format. Whether you are preparing models for FDM, SLA, or SLS printing, STL remains the go-to format for transferring 3D geometry between software tools.
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Rotate, pan, and zoom to inspect every detail of your 3D model. Toggle wireframe view and use measurement tools to check geometry.
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Load and render STL files directly in your browser using WebGL. No plugins, downloads, or installations required.
Rotate, pan, and zoom your STL model with intuitive mouse and touch controls. Examine every surface and angle.
Switch between solid and wireframe rendering to inspect triangle mesh density and surface topology.
View vertex count, face count, and bounding box dimensions instantly when your STL model loads.
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