Free STL Repair — Fix Holes, Normals & Errors Instantly
A broken STL file can ruin an otherwise good print — rejected by your slicer, full of holes, or printed with normals flipped inside out. This free STL repair tool fixes the most common problems automatically, right in your browser, so your file is ready to slice in seconds.
Free Tool
STL Repair Tool
Fixes the most common problems that stop an STL from slicing cleanly — open holes, flipped normals, duplicate geometry, and stray degenerate triangles. Runs entirely in your browser; your file never leaves your computer.
Choose an STL file
or drag it here — max 50MB
Triangles
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Duplicate vertices merged
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Degenerate triangles removed
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Duplicate triangles removed
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Inconsistent normals fixed
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Holes found & filled
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Open edges remaining
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Result
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Some open edges couldn't be automatically closed — usually caused by very complex or badly broken geometry. The rest of the mesh has still been repaired and is ready to download.
Ready to print it?
Send it to print →