Merge multiple STL files
Upload two or more STL or OBJ meshes and combine their triangle surfaces into one Binary STL. Overlapping shells are preserved; this is not a Boolean union.
Technical principle
Upload two or more STL or OBJ meshes and combine their triangle surfaces into one Binary STL. Overlapping shells are preserved; this is not a Boolean union. The worker parses the mesh, applies the selected operation, and writes a bounded result.…
Parameters at a glance
| Parameter | Value | Why it matters |
|---|---|---|
| Input format | .STL,.OBJ | Accepted source file extension. |
| Output format | STL | Geometry or archive produced by this route. |
| File size | Up to 250 MB | Upload guardrail before parsing or conversion. |
| Mesh review | Preview, normals, open edges | Check geometry before download or slicing. |
Workflow and technical limits
Upload two or more STL or OBJ meshes and combine their triangle surfaces into one Binary STL. Overlapping shells are preserved; this is not a Boolean union.
- Select at least two STL or OBJ files.
- Review the generated mesh preview and diagnostics.
- Download the STL result and verify scale in the destination tool.
Frequently Asked Questions
Can I run merge multiple stl files online?
Yes. Select at least two supported meshes and the worker combines their triangle surfaces into one Binary STL.
What does the STL result preserve?
Merge preserves every valid input triangle with vertex indices remapped into one mesh. It does not remove overlaps or perform a Boolean union.
How should I validate the downloaded STL?
Open it in STL Checker or your slicer and confirm scale, face normals, open edges, and watertight status before manufacturing.