Drop your STL file here
or click to browse — repaired locally, never uploaded
Binary or ASCII STL · up to 200MB
Free STL Repair fixes common mesh topology problems such as holes, duplicate faces, inconsistent normals and tiny debris shells. It runs entirely in your browser and shows Print Readiness reports before and after repair.
- One-click local repair with no upload
- Before and after Print Readiness reports
- Downloadable binary STL and detailed repair log
One-Click STL Topology Repair
A deterministic repair pipeline cleans the mesh in a background worker, then shows exactly what changed before you download anything.
Fill Open Holes
Boundary loops are detected and capped with planar triangulation, including a safe fallback for difficult openings. Oversized or open chains are reported instead of silently changed.
Clean Non-Manifold Geometry
Duplicate, opposing, degenerate and internal faces are removed before connected faces are reoriented with outward-facing normals.
Private Before-and-After Reports
Compare watertight, manifold, wall-thickness, shell and base-contact checks before and after repair. All processing stays on your device.
How Free STL Repair Works
Drop, repair, compare and download — with zero uploads.
Drop Your STL
Choose a binary or ASCII STL. The browser reads it locally and creates a Print Readiness report before changing the mesh.
Run the Repair Pipeline
A Web Worker welds duplicate vertices, removes broken faces, unifies normals, fills suitable boundary loops and removes tiny disconnected debris.
Compare and Download
Review before-and-after reports and the step-by-step repair log, then download a compact binary STL with the repaired geometry.
STL Repair FAQ
When to Repair an STL
Use automatic repair for common topology damage before slicing or manual modeling.
Clean Generated Meshes
Weld seam duplicates, close small holes and remove floating fragments common in AI-generated geometry.
Seal Scan Openings
Repair manageable boundary loops and inconsistent face orientation left by scan reconstruction.
Prepare Marketplace Files
Check and repair third-party STL files before spending time and material on a print.
Validate Exports
Compare reports after cleanup and catch remaining design issues before publishing a model.
Why Repair STL Files with Loreform
Entirely Local
Your model stays in your browser from file selection through repaired STL download.
Transparent Changes
Every pipeline step reports triangle counts and a plain-language description of its work.
Print-Focused Validation
The repair result is checked for watertightness, manifold topology, wall thickness, shells and base contact.
Free and Immediate
No sign-up, credits or server queue. Processing starts as soon as your browser reads the file.