Resize and rotate
Scale uniformly or per axis and rotate to the orientation your printer needs, with exact typed values.
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Edit STL Files Online
Open an STL in VIZON to resize, rotate, combine, cut and simplify it in your browser, then export it as STL again for 3D printing.
Drop a STL file here
The preview runs in your browser. Your file is not uploaded.
What you can do
Cut holes and slots
Subtract a cylinder or box from the STL with a boolean to make holes, slots and cut-outs.
Combine parts
Join the parts of a model into one mesh, or merge overlapping parts into a single solid with boolean union.
Split into parts
Separate loose parts or selected faces into their own objects, and print them separately.
Reduce triangles
Decimate heavy scans or exports to 50% or 20% to make them easier to handle.
Edit the mesh
Select vertices and faces to extrude, bevel or delete geometry by hand.
How to edit an STL file online
Want more detail? Read the guide: How to Edit an STL File Without Blender.
- Drop your STL above to check it, then upload it to your VIZON library.
- Open it in the 3D Model Creator.
- Make your edits: scale, rotate, boolean, separate or decimate.
- Save to your library.
- Open the saved model in Studio and choose Export, STL.
STL editing versus parametric CAD
An STL is only triangles: it has no dimensions, features or history, so edits act on the surface. That is fine for scaling, cutting, combining and cleaning up a model.
If you need to change a hole diameter or a wall thickness precisely, rebuild the part in the VIZON CAD editor, where every size is a number you can change. CAD parts export to STL in millimetres.
Made in VIZON
Real models built with these tools. Each one is free to download.
Frequently asked questions
Can I edit an STL file without Blender?
Yes. VIZON handles the common STL edits in the browser: resize, rotate, boolean cuts and merges, splitting and decimation.
Can I merge two separate STL files into one?
Not yet. Opening a file replaces the current scene, so two separate STL files cannot be brought together today. Parts inside one model can be joined (Ctrl+J) or merged with boolean union.
What units will my STL be in?
STL files do not store units. Most slicers read them as millimetres, and VIZON CAD exports STL in millimetres.
How do I export back to STL?
Save the edited model, open it in Studio, and choose Export, STL.
Related VIZON tools
Ready to try the STL editor?
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