Open .glb and .gltf files free in your browser, in colour and standing upright. Measure the model, fix its scale, repair it and export STL or 3MF to print it.
GLB is how 3D gets delivered on the web, in AR and from many AI 3D generators, and most quick previews hand it back grey or lying on its side. Drop one here and it opens in colour, standing upright on a build plate, ready to measure and to print, if that is where it is headed.
Free to use · Runs in your browser · No upload wait
A GLB usually arrives from somewhere else: a scan, a marketplace, an AR asset, an AI 3D generator. The questions that follow are all about whether it is usable.
Each point on the surface takes its colour from the material’s colour image (the base-colour texture) where there is one, or from colour stored on the points themselves (a vertex-colour attribute), or the flat material colour, so a catalogue or scanned model looks like itself instead of turning grey the moment it is opened.
glTF treats Y as up (Y-up), while a printer’s build plate treats Z as up (Z-up). OwlCAD rotates the model on the way in so it stands rather than lying on its side, and applies the exact inverse on export, so a round-trip through OwlCAD comes back identical.
glTF is defined in metres and OwlCAD reads it that way, so a web or AR asset arrives at its real size. When a file was authored in another unit, reinterpret it as millimetres, centimetres, inches, or metres in one click, with the resulting dimensions previewed before you accept, then type exact values.
Edge lengths, hole radii and diameters, true arc lengths, face areas, angles, and the smallest gap between two parts, plus overall size, volume and triangle count.
Web and AR assets are rarely print-ready. Run the print check for thin walls, overhangs (areas that would need supports), and watertightness (closed, with no holes, so a slicer reads it as solid), repair the mesh, hollow it, auto-orient it, and see what it will weigh and cost in filament.
Export STL or 3MF for a slicer such as Bambu Studio, PrusaSlicer, Cura or OrcaSlicer, OBJ or GLB for other 3D software, or SVG and DXF of a 2D projection for a laser cutter, all at true scale.
No download, no account needed. It opens in your browser, in colour.
It opens on your device, it is saved to your workspace as you work, and it exports back out in the format your slicer wants.
Your browser reads and renders the model itself, so it appears as soon as you drop it in — you are never queued behind anyone else’s upload, and the file does not travel anywhere before you can see it.
Most online viewers forget your file the moment you close the tab. OwlCAD keeps the model in your own workspace and syncs it as you work, so it is still there when you come back to this browser. Create a free account and it follows you to any device, and your projects dashboard lets you delete anything you no longer want.
When you are done, export STL, 3MF, OBJ, GLB or STEP — the format your slicer or your colleague actually needs, not a project file that only opens here.
Drag the .glb onto the build plate — it renders immediately. Your browser reads and displays the file itself, so there is no upload to wait for, no queue, and no account needed to look at it.
Yes, in most cases. OwlCAD takes each vertex’s colour from the material’s base-colour texture where there is one, otherwise from a vertex-colour attribute, otherwise from the flat material colour — so a catalogue or scanned model arrives looking like itself rather than grey. Full PBR materials, animation, and rigging are not carried over: this is a modeling tool, and what survives is the shape and its colour.
glTF is Y-up and OwlCAD is Z-up like a printer’s build plate, so the import rotates the model to stand it up. The export applies the exact inverse, which means a GLB round-trip through OwlCAD comes back identical rather than progressively tipped.
glTF defines its unit as the metre, so OwlCAD reads a GLB in metres, and writes its own GLB exports in metres too: they open at their real size in Blender, AR viewers and game engines, and come back exact. Some tools write millimetres instead, so a file whose largest side is more than 5 units is read as millimetres. If a model still lands at the wrong size, the bar shown on import reinterprets it in one click and previews the resulting dimensions before you accept.
Yes. Open the .glb and export STL, 3MF, OBJ, or GLB — and because this is a full editor rather than a converter, you can scale it to a real size, hollow it, repair non-watertight geometry (holes or inside-out faces a slicer can’t fill), and run the print check first, which is usually what a web or AR asset needs before it will print.
Yes. Viewing, measuring, editing, repairing, and exporting are free forever, with no watermark. Only AI generation is part of OwlCAD Pro.