Mesh converter repair

Convert ASCII and binary STL files while removing exact duplicate and zero-area faces.

On your device · No account

Privacy details

Mesh converter repair processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Choose an STL mesh

Output format

Mesh cleanup

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

Using the mesh converter repair

Cleanup compares exact triangle coordinates, removes repeated faces regardless of vertex order, drops triangles with zero area and recomputes normals. Coordinates are otherwise preserved, subject to float32 precision in binary STL.

Next: STL viewer

A worked example

The defect example contains a four-face tetrahedron, one repeated face and one empty face. Cleanup retains four triangles and reports one removal of each kind.

Before you use the result

STL only. This does not repair holes, intersections, inverted shells or manifold topology. It is not a printability check. Binary output uses float32 coordinates; ASCII preserves parsed numeric values.

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ToolOctopus. “Mesh converter repair.” Updated 2026-09-19. https://tooloctopus.com/mesh-converter-repair.

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