Open .stl 3D models directly in your browser - completely free, no slicer or CAD software needed. Rotate, zoom, and pan an interactive preview, check the dimensions, volume, and triangle count before printing, take PNG snapshots, and convert STL to OBJ. Working with other formats? Try our DDS Viewer, PSD Viewer, SVG Viewer, or browse all file viewers.
or click to browse - binary and ASCII STL both work
Drag and drop your .stl file onto the upload area, or click to browse - downloads from Thingiverse and Printables, CAD exports, and 3D scans all work. Binary and ASCII STL are both supported, up to 150 MB, parsed locally in your browser.
The model loads into an interactive viewport - drag to rotate, scroll to zoom, right-drag to pan, with a turntable mode for hands-free spinning. Check the dimensions, volume, surface area, and triangle count, switch material colors, and toggle wireframe to inspect the mesh itself.
Download a PNG snapshot of the current view - perfect for documentation, marketplace listings, or sharing - or convert the model to OBJ. Both happen entirely in your browser.
Smooth WebGL rendering with drag-to-rotate, scroll zoom, panning, touch support, and a turntable auto-rotate mode.
Bounding-box dimensions in millimeters, mesh volume, surface area, and triangle count - check fit and material use before slicing.
Toggle wireframe to inspect the mesh structure, and a scaled reference grid to judge the model's real-world size.
Preview the model in gray, blue, green, or orange with realistic shading - closer to what the finished print looks like.
Save the current view as a PNG image - ideal for documentation, model listings, and sharing previews.
Convert the loaded model to Wavefront OBJ directly in your browser - no upload, no queue.
Both STL flavors open automatically, and broken or mislabeled files get clear, friendly error messages.
All parsing and rendering happens in your browser. Models never leave your device - safe for client work and prototypes.
STL is the lingua franca of 3D printing: nearly every model on Thingiverse, Printables, and MyMiniFactory, every slicer, and every CAD export pipeline speaks it. The format describes a model purely as a mesh of triangles - no color, no materials, no units - which is why a quick STL viewer is so handy for checking what a file actually contains before slicing or buying.
STL comes in two flavors: compact binary (the common one) and human-readable ASCII. This viewer detects and opens both, renders the mesh with realistic shading, and reports the numbers printers care about - bounding-box size in millimeters (the 3D printing convention), mesh volume for material estimates, and triangle count as a complexity gauge.
OBJ adds color and texture support, STEP stores exact CAD surfaces instead of triangles, and 3MF is the modern ZIP-based print format. STL remains the universal exchange format, and the built-in STL to OBJ export covers the most common conversion need. If you drop one of the other formats here, the viewer identifies it and tells you how to get an STL out of it.
Game and design assets have their own viewers - DDS textures and Photoshop files - and the full collection of formats is on the file viewers page.
Upload your .stl file here and inspect it in an interactive 3D viewport - rotate, zoom, and pan with your mouse or touch. No slicer, CAD program, or download needed; it works on Windows, Mac, Linux, Chromebooks, and mobile.
STL is the standard 3D printing format: a mesh of triangles describing the surface of a model. It comes in two flavors - compact binary and human-readable ASCII - and this viewer opens both. STL stores no color, materials, or units; the 3D printing convention is millimeters.
Yes. The viewer shows the bounding-box dimensions in millimeters - compare them with your printer's build volume. It also reports volume and surface area, useful for estimating material use and print cost.
The viewer sums the signed volume of every triangle in the mesh - the standard method slicers use. The figure is accurate for closed, watertight models; meshes with holes or self-intersections may report a smaller value.
Yes. Click the OBJ button to convert the loaded model to a Wavefront OBJ file directly in your browser - no upload, no waiting. Very large meshes beyond about 1.5 million triangles should be decimated first.
Yes. The model is parsed and rendered locally in your browser using WebGL - it is never uploaded to our servers. That makes the viewer safe for client work and unreleased designs.
Not yet - this viewer is dedicated to STL. If you drop an OBJ, STEP, 3MF, PLY, or G-code file, it identifies the format and tells you how to get an STL out of it. OBJ support is on our roadmap.
The viewer renders both sides of every triangle, so most flipped-normal issues still display fine. If a model looks wrong here, it often has mesh errors - run it through your slicer's repair function or a tool like Meshmixer before printing. Still having trouble? Please contact us and we'll be happy to help!