Open3D: STL & 3D Model Viewer

v1.0.8 adds STEP, IGES, DXF, DAE & 3DS. Real HDR lighting. Multi-file load for OBJ + textures. 12 formats — free, no account, fully offline.

Opens any 3D file — STL, GLB, OBJ, FBX, STEP, IGES, DXF, USDZ and more. Free, no account, fully offline. Open a 3D file, view it instantly, and see it in AR. No account, no sign-up, no cloud upload. Your files never leave your phone.

Whether you're a 3D-printing hobbyist checking an STL before you slice it, or a 3D artist previewing a GLB export, Open3D Viewer opens it in seconds, without the paywalls and login screens other 3D viewers force on you.

SUPPORTED 3D FILE FORMATS STL, GLB, GLTF, OBJ, FBX, STEP, IGES, DXF, DAE, 3DS, PLY, 3MF and USDZ

A 3D VIEWER THAT DOES THE BASICS RIGHT

• Open files from your file manager, email, downloads, or any "Open with" menu
• Smooth orbit, pan and zoom touch controls
• Render modes: solid, wireframe, X-ray, textured
• Backgrounds: studio, sunset, dark, white, HDRI
• View 3D models in AR, placed in your real room (where supported)
• Play built-in animations
• Capture a screenshot or a rotating GIF and save to Photos
• Full model specs: triangle count, vertices, materials, textures, bounding box

MEASURE AND INSPECT

• Tap two points on the model for a real-world distance, shown right on the line
• Ground grid with distance labels in mm, cm, or meters along every edge
• Cross-section / clipping plane to slice through any axis
• Switch between metric and imperial units

BUILT FOR 3D PRINTING

• Print-readiness check: manifold / watertight, overhangs, wall thickness
• Bed-fit check for popular printers (Bambu A1, Prusa MK4, Ender 3, X1C)
• Rough weight, filament length and cost estimates
• Convert and export between GLB and STL

ALSO ON WEB AND WINDOWS The same engine runs everywhere — open3d.app in any browser, and on the Microsoft Store as a native Windows app with file associations. Pick up your 3D files anywhere.

NO ACCOUNT. NO CLOUD. NO NONSENSE.

• No sign-up, ever
• 100% on-device, works offline (ads need a connection)
• We never read, scan, or upload your files
• We don't track which files you open

Open3D Viewer is free, supported by ads: a small banner while you browse and an occasional full-screen ad. No subscription, no in-app purchases.

The STL viewer and GLB viewer that makers and 3D artists actually want: clean, fast, and local.

Measurements and print-readiness figures are convenient estimates, not a replacement for a slicer or proper measuring tools. See the in-app Disclaimer.

Privacy policy: https://open3d.app/privacy.html