What is preserved
All three axes use one scale factor, preserving proportions and triangle topology.
Free · No signup · Browser-local
STL Resizer
Scale an STL uniformly while preserving its proportions and surface triangles.
Choose .stl file
STLUniform scale · Browser-local
Interactive 3D model preview
Choose a local 3D file to start the preview.
Measure and resize an STL
- width
- 100.00 mm
- height
- 50.00 mm
- depth
- 25.00 mm
What can be lost or unsupported
- STL units remain ambiguous
- Scaling does not repair thin walls or printability
- Materials and metadata are not added
How to use this tool
- Choose a local .stl file under 100 MB.
- Wait for the preview and statistics.
- Apply the calculated uniform scale and download the resized STL.
Common uses
- Fit a model within a build volume
- Convert a known dimension to millimeters
- Create a uniformly scaled STL copy
Frequently asked questions
Are my files uploaded?
No. Model parsing, preview, and export run in your browser.
Is the conversion lossless?
No format conversion is described as lossless. Review the format-specific warnings above before using the output.
What is the file-size limit?
100 MB is a safety ceiling, not a guarantee. Mobile devices may need substantially smaller files.