Free & Instant

Convert OBJ to STL 3D Model Online — Free Converter

Transform OBJ 3D models to STL for 3D printing.

Upload your file

Drag & drop your .obj file here, or browse
Multiple files supported

.OBJ.STL

Maximum file size: 500 MB · Multiple files supported

100% private — files are processed in your browser, never uploaded

How It Works

OBJ to STL in 4 Easy Steps

Convert OBJ to STL in seconds — no sign-up, no upload, no catch.

  1. 1

    Upload OBJ file

    Drop your .obj 3D model or click Browse.

  2. 2

    STL auto-selected

    STL is pre-selected as the output format.

  3. 3

    Convert locally

    Your 3D model is converted to STL in your browser.

  4. 4

    Download STL

    Save your STL file — ready for 3D printing.

Use Cases

Why convert OBJ to STL?

  • Prepare OBJ models for 3D printing
  • Convert models for Cura, PrusaSlicer, and other slicers
  • Make OBJ files usable in CAD software

Related 3D Models Conversion Tools

Need to convert other formats? Try these popular free online tools.

.stl.obj
STL to OBJ
.glb.gltf
GLB to GLTF
.ply.stl
PLY to STL

Why Convert OBJ to STL with Mr. Converter?

Discover why millions of users trust Mr. Converter for fast, secure, and accurate OBJ to STL file conversions directly inside their browser.

100% Private & Secure

  • ✓Zero File Uploads: Conversions execute locally on your machine using browser WebAssembly.
  • ✓No Cloud Storage: Your confidential data never touches remote servers or third-party databases.
  • ✓GDPR & Privacy Compliant: Complete end-to-end privacy for sensitive documents and media.

Lightning Fast & Unlimited

  • ✓Instant Processing: Skip queue wait times and server upload delays.
  • ✓No File Size Limits: Convert large OBJ files without artificial size restrictions or paywalls.
  • ✓No Email Required: Instant direct downloads without registration or credit cards.

Format Comparison: OBJ vs STL

Feature / PropertyOBJ FormatSTL Format
Primary CategorySource Document / MediaTarget Converted File
Browser CompatibilityStandard Compatible100% Universal Support
File CompressionUncompressed / Original StructOptimized & Portable
Privacy & EncryptionPreserved during conversionEncrypted output supported
Typical Use CaseEditing & Content CreationSharing, Archiving & Publishing
FAQ

Frequently Asked Questions

Yes. All vertices, faces, and normals are converted faithfully.