Drop STL, 3MF, or PLY files here
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Free STL Viewer Online — Open, Measure, and Share 3D Models in Your Browser
STLViewer is a free, privacy-first web app for opening STL, 3MF, and PLY 3D models directly in your browser. No installation, no account required for quick previews. Rotate, measure, pick materials, and share a single link with collaborators.
STL, 3MF, and PLY support
Drop any STL (binary or ASCII), 3MF, or PLY (mesh) file into the viewer and render it instantly with WebGL. No file size tricks, no cloud processing for anonymous uploads.
Measurement and material tools
Measure distances on the mesh, switch between metal, wood, plastic, stone, and colored material presets, and capture the exact view you want to share.
Private by default
Share links are the access token — they are not indexed by search engines and are only discoverable to people you send them to.
Runs anywhere
Works in any modern browser on desktop, tablet, or phone. Uploads run against a secure R2-backed storage layer with signed, time-bound upload URLs.
STLViewer is a lightweight alternative to desktop viewers. Use it to review print jobs, inspect scans, or demo a CAD export. The application is fully client-side — the 3D scene, camera controls, and material rendering all run on your device using Three.js and WebGL.