Resize an STL File Online

Drop your STL to see its exact size, then scale it in VIZON to the dimensions you need and export a new STL for your slicer.

Drop a STL file here

The preview runs in your browser. Your file is not uploaded.

What you can do

The preview above reads the bounding box straight from the file, so you know the starting size before you scale.

Select the model and press S, or type a scale such as 1.5 or 0.5 in the transform panel. Uniform scale keeps the proportions.

Untick uniform scale to stretch or squash only width, depth or height.

A model that imports 25.4 times too small was designed in inches. Scale it by 25.4 to convert to millimetres.

Press R, or type rotation values, to lay the part flat on the bed before export.

Save the model, then export STL from Studio for your slicer.

Drop the STL above and note its size, for example 40 x 20 x 10.
Work out the factor: target size divided by current size. 60 mm from 40 mm is 1.5.
Upload the STL to VIZON and open it in the 3D Model Creator.
Select it and type the factor into Scale, with uniform scale on.
Save, open it in Studio and choose Export, STL.

Format names link to a plain explanation of each file type.

How do I know what size my STL is?

Drop it on this page. The preview shows the bounding box in the file units, which are almost always millimetres.

Why is my STL tiny in the slicer?

It was probably exported in inches or metres. STL files store no units, so scale by 25.4 for inches or 1000 for metres.

Does scaling change hole sizes too?

Yes, uniform scaling changes every dimension, holes included. To keep a hole size fixed, rebuild the part in VIZON CAD.

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