MESH METRICS
Compare STL versions online
Compare two STL files by mesh type, triangle count, dimensions, bounds, surface area, and volume. Both ASCII and binary STL files stay on your device.
STL
Two files in. Clear changes out.
- 01Choose versionsPick the old file first and the new file second.
- 02Compare locallyYour browser reads and analyzes both files on this device.
- 03Review or exportInspect the differences and save a structured summary.
What an STL version comparison reveals
Scale and orientationCompare X, Y, and Z dimensions plus minimum and maximum bounds to catch resizing, rotation, or origin changes.
Mesh revisionsUse triangle count and file type to spot remeshing, decimation, repair, or export-setting changes.
Shape indicatorsCompare surface area and estimated volume to identify material geometry changes before opening a full CAD workflow.
Format, limits & common questions
Are my files uploaded?
No. PrintDiff has no file upload endpoint. File contents are read by browser APIs and stay on your device.
What is the current file size limit?
The preview limits each file to 50 MB to keep comparisons responsive on ordinary phones and laptops.
What if a file is damaged?
PrintDiff checks the actual file structure, not only its extension, and explains when a file cannot be parsed.