STLGenie

STL Viewer — Open and Inspect 3D Models in Your Browser

Who this is for: For anyone who received a 3D file and just wants to see it: downloads from model sites, files friends sent, exports from your own CAD that need a sanity check before slicing.

Open an STL (or OBJ, PLY, GLB, 3MF) right in your browser — orbit, zoom, inspect, then download it back out in any format. Runs locally, nothing uploaded.

Quick answer: The STL viewer opens STL, OBJ, PLY, GLB, GLTF and 3MF files directly in your browser — orbit and inspect, check triangle counts and dimensions, then export to STL, OBJ, PLY or GLB. Runs locally, no upload, no account, free without limits.

Drop a 3D file hereSTL · OBJ · PLY · GLB · GLTF · 3MF — up to 30MB
Core facts
OpensSTL · OBJ · PLY · GLB · GLTF · 3MF (up to 30MB)
ExportsSTL · OBJ · PLY · GLB
ControlsDrag to orbit, scroll to zoom — plus size/triangle stats panel
CostFree and unlimited — runs in your browser, zero server cost
PrivacyNothing uploaded — the file never leaves your device
LimitsViewer and converter only — no modeling or editing

What this viewer does

Drop a 3D file and this page renders it with the same WebGL tech that powers browser games — orbit with a drag, zoom with the wheel, inspect from every angle. It opens the six formats makers actually run into: STL, OBJ, PLY, GLB, GLTF and 3MF.

More than a viewer, it is also a quiet converter: load a file of any supported format and download it back out as STL, OBJ, PLY or GLB. That covers the common 'what I have versus what my next tool needs' gap without ever sending the file anywhere — the whole thing runs on your device.

A few practical notes: files up to 30MB load comfortably on a typical laptop; complex meshes in the millions of triangles will spin fans but render. Drag to orbit, scroll to zoom, and the stats panel tells you what loaded: triangle count, bounding box and mesh count — the three numbers worth checking before a big print.

Common uses

  • Sanity-checking an STL before slicing (orientation, size, triangle count)
  • Opening a friend's OBJ without installing Blender
  • Viewing a GLB product model that arrived in an email
  • Quick-converting formats between the tools you actually own
  • Checking a 3MF project's meshes before re-printing

Frequently Asked Questions

Which formats can the viewer open?
STL (binary and ASCII), OBJ, PLY (ASCII and binary), GLB, GLTF (with embedded resources) and 3MF. That covers what makes it out of slicers, CAD exports and model marketplaces.
Can I convert between formats here?
Yes — load in any supported format, export to STL, OBJ, PLY or GLB. It is the same converter engine that runs in this site's format pages, consolidated into one inspect-then-export workspace.
Are big models a problem?
Files up to 30MB load fine on a normal machine. Beyond that it depends on your device's memory — million-triangle models render, but give the browser a moment. Nothing is uploaded, so large files never wait on an internet connection either.
Does it show colors and textures?
Colors show for formats that carry them (GLB/GLTF textures, PLY vertex colors, 3MF object colors). STL has no color by design, so an STL always renders in neutral gray — that is the format, not the viewer.
Can I edit the model here?
No, and we say so plainly: this is a viewer and format converter, not a modeling tool. For edits — scaling, cutting, boolean operations — use your slicer, Blender, or a CAD tool. The 3D stats panel is the most useful 'edit' here: knowing a mesh's real size before you scale it.

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