This STL resizer changes a model's actual geometry by percentage or target dimensions. Keep proportions locked for a uniform adjustment, or deliberately stretch individual axes. Review the updated measurements and export a resized file, with local processing and no account required.
Use an STL resizer to fit a decorative bust within a printer’s build volume. For a 240 mm wide model and a 180 mm width target, choose 75 percent. You can resize STL geometry uniformly, but holes and thin details shrink too.
Check all three resulting dimensions against your usable bed and height, leaving room for brims and supports. Enter your own target: there is no printer database, automatic bed fitting or part arrangement. Review slicing before committing material.
Select Open STL, drop a model into the workspace or select “Or explore a sample model”. In the STL resizer, check Width on X, Depth on Y and Height on Z before entering a target. Confirm whether the displayed millimeter interpretation matches the source design's intended physical size.
To halve every dimension, enter 50 under Scale percentage and select Apply percentage. For a known width, enter the Target X dimension and select Apply dimensions. Keep Lock proportions active to update Y and Z by the same ratio. The STL resizer also allows independent targets when you unlock that control.
Read the updated dimensions and inspect the silhouette. Use Undo if the result differs from your plan; use Redo to compare again. Select Export STL when ready, then reopen the download and verify its size. The STL resizer writes changed coordinates into binary STL, so the exported model carries the adjustment.
To resize a model from 120 mm to 90 mm, use 75 percent. Scaling modes: Scale percentage (uniform), Target X/Y/Z with Lock proportions, or unlocked per-axis targets. Uniform scaling preserves relative proportions, but it changes wall thickness, holes and clearances too. Test an interface before committing to a full print, especially when the model mates with an unscaled component.
Reducing STL scale changes dimensions rather than mesh complexity. Halving all lengths gives one quarter of the surface area and one eighth of the enclosed volume for a suitable closed mesh. Triangle count stays the same; a smaller object does not necessarily produce a smaller file or a faster preview.
The STL resizer can also correct a confirmed inch-to-millimeter mismatch: 25.4 times corresponds to 2540 percent. Confirm the source convention first. Unlocked axis scaling intentionally distorts shapes; circular holes can become elliptical. It is useful for deliberate stretching, but it cannot preserve selected features while resizing the rest of the part.
The STL resizer accepts ASCII and binary inputs up to 25 MiB and 400,000 triangles. STL itself stores no units; coordinates are interpreted as millimeters here. A flat model with a zero dimension needs percentage scaling instead of target-size scaling. Export uses 32-bit binary coordinates, which can lose very small details. Save your result before leaving, and verify dimensions again in your slicer.
Yes. The workspace creates a new download. Keep your original on disk and give the resized version a descriptive name so you can compare or return to the source later.
With Lock proportions active, a target dimension applies the same ratio to every axis. Percentage scaling is also uniform. Unlock the control only when different axis ratios are intentional.
Enter a value below 100 in Scale percentage and select Apply percentage. To scale STL geometry to a known width instead, enter Target X with Lock proportions active and select Apply dimensions.
No. Scaling moves existing vertices. It does not simplify the surface or repair mesh problems.
You can make its geometry larger, but scaling cannot recreate detail absent from the mesh. Existing facets become larger too, and the original surface resolution remains the limit.
No. Printer calibration, material shrinkage and manufacturing tolerances still matter. Check the resulting dimensions and print a small fit test when a mating surface is important.