OBJ to STL Converter
Convert OBJ to STL free in your browser. Files never leave your device.
Drop files anywhere on this pageTap to choose a file
Mix any types. We detect each one and pick its best format.Photos, Files or iCloud • up to 100 MB
Up to 100 MB per file • Multiple files at once • Ctrl+V works too
How to convert OBJ to STL
Add your OBJ (.obj) file
Drag and drop your .obj file into the converter box above or click Choose files. You can also paste screenshots or clipboard data with Ctrl+V.
Convert to STL (.stl)
Our in-browser engine processes your .obj file directly in memory. No files are uploaded to any server, guaranteeing 100% private conversion.
Download your fresh .stl
Click Download to save your newly converted .stl file to your device. There are zero watermarks, zero size traps, and no waiting room.
What are OBJ and STL files?
What is a OBJ file?
.objWavefront universal 3D polygonal geometry format. OBJ files are widely utilized across desktop applications and digital workflows, but may require conversion when sharing with recipients who lack native viewing software.
What is a STL file?
.stlStandard Stereolithography 3D triangular mesh format. Converting to STL format ensures universal compatibility across modern browsers, mobile devices, and third-party software suites.
OBJ to STL conversion settings explained
When converting OBJ to STL, precision matters for slicing and 3D printing:
- Linear Deflection (Chordal Deviation): Controls how closely triangular facets follow curved surfaces (0.01 mm for precision parts, 0.1 mm for rapid prototyping).
- Angular Deflection: Determines the angle between adjacent facet normals along curved fillets, ensuring smooth circular silhouettes without polygon stepping.
- Manifold & Watertight Validation: Verifies that meshes have no open edges or non-manifold junctions before export into slicing software like Cura or PrusaSlicer.
Frequently asked questions about OBJ to STL
Is converting OBJ to STL free on Any File Converter?
Yes, converting OBJ to STL is 100% free with no watermark, no file quantity limits, and no account registration.
Are my OBJ files kept private during conversion?
All conversions run client-side in your browser via WebAssembly and Web Workers. Your files are never uploaded to any remote server.
Can I convert multiple OBJ files to STL simultaneously?
Yes! You can add multiple files at once, process them in batch, and download them individually or bundled in a ZIP file.
What software do I need to open the resulting STL file?
The converted STL file conforms to standard format specifications and opens in any compatible viewer, editor, or device.