Convert OBJ to STL Without Losing Detail
Transform OBJ meshes into watertight STL files ready for slicing and printing. No uploads, no plugins.
OBJ to STL Converter
Convert OBJ meshes to STL directly in your browser. Files stay on your device.
Before you start
- Max file size: 50MB. Large meshes may impact browser performance.
- STL exports geometry only — materials, textures, and colors are removed.
- All processing runs locally in this tab. Nothing is uploaded to a server.
- For smoother handling of bigger files, use a desktop browser or higher-memory device.
Status
Waiting for an OBJ file.
When OBJ to STL Conversion Matters
For Game Assets & Scans
Clean up OBJ meshes from photogrammetry or 3D scanning and export STL that slicers accept instantly.
For Multi-Part Assemblies
Handle grouped meshes, instances, and smoothing groups while preserving topology during conversion.
For Cross-Software Workflows
Move models between DCC tools and slicers without round-tripping through heavy desktop apps.
How to Convert OBJ to STL in 3 Steps
Upload Your OBJ File
Drag and drop your OBJ mesh or browse from disk. We support exports from Blender, Maya, ZBrush, Unity, and more.
Automatic Mesh Processing
We parse quads, ngons, and smoothing groups before exporting clean STL triangles with consistent normals.
Download STL Instantly
Choose binary or ASCII STL and download immediately — ready for slicing, sharing, or archiving.
Why Use Stlconvert for OBJ to STL
Geometry-Aware Conversion
Triangulates quads and ngons, preserves vertex normals, and handles multi-object scenes without collapsing data.
Client-Side Privacy
Runs 100% in your browser. Sensitive assets never leave your device.
Device-Aware Safeguards
File-size limits adjust to your hardware, preventing lockups on low-memory phones and tablets.
Optimized STL Output
Binary STL for compact files, ASCII when human-readable output is required.
Frequently Asked Questions
How do I convert OBJ to STL without losing quality?
Our converter keeps vertex positions and smoothing groups intact, recomputing normals when needed so your STL prints match the source mesh.
Does the converter include materials from the MTL file?
STL only stores geometry, so colors, textures, and materials from the MTL are not preserved. Document appearance separately if needed.
Can I convert large OBJ files?
Desktop browsers handle OBJ files up to about 50MB comfortably. Mobile devices are capped at 25MB to avoid memory crashes.
Which browsers are supported?
Latest versions of Chrome, Edge, Firefox, and Safari are supported. Enable hardware acceleration for best performance.
Is this OBJ to STL converter free?
Yes. STLConvert runs entirely in the browser with no cost, no watermarks, and no registration.
Can I preview the mesh before downloading?
Yes. The live WebGL preview lets you inspect geometry, check orientation, and confirm scale before exporting.