STL Viewer
Open an STL model, rotate it and inspect its geometry. Viewing local files happens in your browser. Switch to Optimize, Convert or Animations without importing the model again.
See what is actually in the file.
The scene graph, every material and texture, their estimated RGBA8 texture memory, the draw calls, the skeleton and every clip. Draco, Meshopt and KTX2 files open too, and nothing is uploaded.
Exported by Khronos glTF Blender I/O v4.3
Open your model
Drop a binary or ASCII .stl file into the viewer. Inspect its shape and triangle count before using it in another workflow.
What to check
STL describes a triangle surface. It does not carry standard material, texture, skeleton or animation data. Units are not defined by the format: confirm scale in your slicer or CAD application.
This is a visual and geometry inspection tool, not a printability or watertightness certificate. Check manifold geometry, wall thickness and supports in a slicer before printing.
Keep working on the same model
Inspect first, then use the tool buttons above to optimize geometry, check export readiness or work with animations. The current model stays open. AI operations may require an account and credits; opening and inspecting the file is free.