Edit OBJ files online, free. Fix a .obj to exact millimetres, cut and combine it with parametric shapes, hollow it, repair the mesh and export STL, 3MF or DXF.
Most online OBJ tools let you spin the model and stop there. Drop a .obj here and you get a full CAD editor: exact millimetre dimensions, booleans (combine and cut) against real shapes, hollowing, mesh repair and a print check for overhangs and thin walls, then export whatever your slicer wants.
Free to use · Runs in your browser · Start without an account
OBJ is the format that comes out of every sculpting and scanning tool, and the one that usually needs work before it prints.
Drag a .obj (say, one downloaded from Printables, MakerWorld or Thingiverse) onto the build plate and it renders straight away — your browser reads the file itself, so there is no upload queue and nothing to wait for before you see it.
OBJ records no units, so a model exported at scene scale can arrive wildly off. Reinterpret the file as millimetres, centimetres, inches or metres in one click, with the resulting dimensions previewed before you accept, then type exact values.
Boolean union, subtract, and intersect (combine and cut) your OBJ against parametric primitives (simple shapes you can resize): add a mounting tab, cut a cable hole, flatten a base, or merge two pieces into one printable body. Non-destructive and fully undoable.
Hollow out a solid model (shell it) to a set wall thickness and add drainage holes, then see what the result will weigh and cost in filament, so you can tell exactly what the hollowing saved before you slice.
Measure edge lengths, hole radii and diameters, true arc lengths, face areas, angles, and the smallest gap between two parts: the numbers you need to make something fit a model you did not draw.
Save print-ready STL or 3MF for Bambu Studio, PrusaSlicer, Cura or OrcaSlicer, OBJ or GLB for other 3D software, and SVG or DXF of a 2D projection for a laser cutter. Clean, welded geometry, repaired before it reaches your slicer.
An OBJ usually needs a fix before it prints: the right size, a flat base, a hole, or a repair. You can make those changes here, in a browser tab, with nothing to install.
Drag the .obj onto this page or onto the editor’s build plate, or click to choose it. OBJ records no units, so if it arrives the wrong size, reinterpret it as millimetres, centimetres, inches or metres, with the resulting dimensions previewed first.
Select it and type exact values to resize, move or rotate it. Cut holes or add tabs with a boolean against real shapes, hollow it to a wall thickness, and run the print check to repair a mesh that isn’t watertight (holes or inside-out faces your slicer can’t fill).
Export STL or 3MF for printing, or OBJ and GLB for other 3D software, then open the file in your slicer as usual.
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.
No download, no account needed, and your work autosaves as you go.
Yes. Drag a .obj onto the build plate and it opens in a full browser CAD editor — not just a viewer. Scale it to exact millimetres, cut and combine it with parametric shapes, hollow it, repair the mesh, and export it again. No install, and no account needed to start.
Your browser reads and renders it, so it is on screen before anything is sent anywhere. It is then saved to your workspace, which syncs to OwlCAD’s storage — including for a guest session — so the model is still there when you come back. Sign in and it follows you to any device; delete it from your projects dashboard whenever you want.
Yes. OBJ records no units, so a model authored in metres or at a scene scale can arrive far too large or small. The bar shown on import reinterprets the file as millimetres, centimetres, inches, or metres in one click and previews the resulting dimensions each time, so you can see which reading is right before accepting it. You can also type exact dimensions afterwards.
STL, 3MF, OBJ, and GLB for meshes, plus SVG and DXF for 2D projections. A part you rebuild parametrically in OwlCAD can also export as solid STEP; an imported OBJ mesh exports to STEP as a faceted shell — a valid solid, but without analytic surfaces to edit in mechanical CAD.
Yes. Each object in the file lands as its own named part, in its colour: OwlCAD reads per-vertex colours where the file carries them, and each material’s colour from its .mtl library when you drop the .mtl (or a zip holding both) together with the OBJ. Texture maps are not applied — a model imports in its flat colours rather than a painted texture.
Yes. Importing, editing, repairing, and exporting are free forever, with no watermark and no export limit. Only AI generation is part of OwlCAD Pro.