Measure STL geometry in your browser to check outer size, triangle count, surface area and an eligible closed mesh's estimated volume. Read the results beside the preview, then download a JSON measurement report. Your file stays on your device, and no account is needed to inspect a model.
Measure STL revisions when a supplier sends a replacement prototype. Save a JSON report for each file and compare outer dimensions, triangle count and surface area under the same unit convention. Unexpected differences can flag a wrong revision or export scale.
Use these records for an overall size check before approval or slicing. They do not verify hole diameters, mounting centers or wall thickness; those require local feature measurements elsewhere.
Use Open STL or drag a local model into the workspace. First establish the source units: the interface interprets coordinates as millimeters, although the format stores no unit metadata. Select “Or explore a sample model” to learn the controls with a known shape.
Inspect Width, Depth and Height along X, Y and Z, then read the minimum and maximum bounds for each axis. Distinguish these outer extents from a particular feature's size. Review triangle count, surface area and the mesh status before using any displayed volume estimate.
Select Export measurements to save JSON containing units, bounds, mesh checks and volume limitations. Keep the source filename and report together so you know which revision you measured. After a change, open the exported revision here to measure it again; switching pages starts a fresh workspace rather than transferring your model.
The bounding box is aligned with the coordinate axes and encloses the whole mesh. Each size is the maximum coordinate minus the minimum on that axis. Rotating the camera leaves those coordinates unchanged; rotating the actual geometry elsewhere can change its axis-aligned extents, even though the object itself has not grown.
Surface area adds the areas of the triangles and is reported in square millimeters under this workspace's unit assumption. It describes the mesh surface, not painted coverage or filament usage.
STL volume is a signed-tetrahedron estimate shown only for a single connected mesh with paired, consistently oriented edges and no degenerate triangles. These checks do not detect self-intersections or certify a solid. An eligible result is still an estimate, and an unavailable result should not be treated as zero.
When you measure STL files for a comparison, keep orientation and unit assumptions consistent. Compare the same fields across revisions and investigate unexpected differences. Volume scales cubically under uniform resizing; doubling every length multiplies a suitable enclosed volume by eight.
Measure STL models here within the 25 MiB and 400,000 triangle import limits. Only ASCII and binary STL are supported. There are no point-to-point, angle or wall-thickness controls, and this page does not repair a failed mesh check. Reports download locally as JSON, with no saved account history. Keep the original geometry alongside each report; numeric values alone cannot reconstruct a model.
Yes. Parsing, mesh checks and report creation happen locally in your browser. A compatible browser needs JavaScript and Web Workers; the interactive preview also requires WebGL.
No. It gives the outer envelope, including empty space around the shape. Material use depends on slicing choices such as infill, shells and supports, which this tool does not calculate.
An open surface, inconsistent edge directions, degenerate triangles or multiple connected components can prevent eligibility. The workspace reports the limitation rather than supplying a solid-volume number it cannot support.
Not directly. The available measurements describe the entire mesh. Use a tool with feature or point selection when you need local distances, hole diameters or thickness checks.
No. Zoom, orbit and pan change the camera only. The dimensions and other statistics come from the loaded vertex coordinates, independently of the magnification on screen.
Yes, by reopening each saved STL. Download reports before leaving and name them clearly. The page does not retain models or compare previous sessions automatically.