STL to OBJ Converter

STL to OBJ Converter

Convert 3D printing STL files to editable Wavefront OBJ meshes. Used for remixing, modifying, UV mapping, and customizing printable models in Blender, Maya, and ZBrush. No software installation required.

Drag & drop your STL file here

or click to browse (Max 50MB for free users)

Supported: .stl files only

Why Convert STL to OBJ?

STL is for printing. OBJ is for editing. Convert your models for remixing, UV mapping, and true creative freedom.

Model Remixing

Download STL models from Thingiverse or Printables, convert to OBJ, and modify in Blender. Combine, cut, add details OBJ gives you full editing control.

UV Mapping

STL has no UV coordinates. Convert to OBJ, unwrap in Blender, and assign textures. OBJ+MTL gives you proper UV channels for texture painting.

Smooth Shading

STL stores flat face normals. OBJ supports smooth per-vertex normals. Our converter reconstructs smooth normals for natural-looking shading in renders.

Universal Editing

OBJ imports into Blender, Maya, 3ds Max, ZBrush, Cinema 4D, Houdini, and every 3D tool. Your printable models become fully editable assets.

About STL to OBJ Conversion

Why convert STL to OBJ?

STL is the universal 3D printing format. A triangle mesh with face normals and no UVs, colors, or materials. OBJ (Wavefront) is the universal mesh editing format, supporting quads and triangles, UV coordinates, smooth normals, and MTL material files. Converting STL to OBJ transforms a static printable file into an editable creative asset: UV unwrap, sculpt, remix, texture, and modify your models in any 3D software.

What is preserved during conversion?

Mesh geometry (triangles) is fully preserved. Face normals are analyzed and smooth per-vertex normals are reconstructed for better shading in OBJ. The output is a clean OBJ+MTL pair with a default material slot. STL files do not contain UV coordinates, colors, or textures. The OBJ will be an untextured mesh with no UV layout, ready for you to unwrap and assign materials in your 3D software.

How to use the converted OBJ file

Import the OBJ into Blender, Maya, 3ds Max, ZBrush, or any modeling tool. For remixing: edit the mesh directly. For texturing: UV unwrap and export to Substance Painter. For 3D printing after editing: convert back to STL using our OBJ to STL converter. The OBJ format opens up the full creative toolkit that STL's printing-focused design doesn't provide.

How to Convert STL to OBJ

Three steps to transform your 3D-printable STL files into editable OBJ meshes.

1

Upload Your STL File

Drag and drop your .stl file. Both binary and ASCII STL are supported. Free tier: up to 50MB with 3 daily conversions.

2

Convert to OBJ

Our cloud engine reads STL triangles, reconstructs smooth vertex normals, and writes clean OBJ+MTL output with a default material slot ready for editing.

3

Edit in Any 3D Tool

Download your OBJ and import into Blender, Maya, ZBrush, or any 3D application. UV unwrap, texture, remix, and sculpt. Files auto-delete within 1 hour.

Related Converters

Converting STL for 3D printing and editing? These converters complete your workflow.

OBJ to STL
The reverse direction OBJ meshes to STL for 3D printing.
STL to FBX
Convert STL to Autodesk FBX for game engines and animation.
STL to GLTF
Convert STL to glTF for web viewers and AR experiences.
OBJ to FBX
The most popular converter OBJ to Autodesk FBX for game engines.
FBX to OBJ
Convert FBX with animation to Wavefront OBJ mesh format.
FAQ

Frequently Asked Questions

Upload your .stl file and click Convert to OBJ. Our engine reads the STL mesh, reconstructs smooth vertex normals, and writes OBJ+MTL output. The OBJ imports into Blender, Maya, 3ds Max, ZBrush, or any modeling tool for UV unwrapping, mesh editing, sculpting, and material assignment.
Yes. You can convert up to 3 files per day for free with files up to 50MB each. For unlimited conversions, 500MB files, and batch processing, upgrade to Pro.
Yes. All triangles, vertex positions, and face normals are preserved. Smooth vertex normals are reconstructed from the STL face normals for natural shading. The OBJ retains the exact geometry of the original STL no simplification or modification occurs.
No. STL files don't contain UV coordinates, so the OBJ output won't have UVs either. After conversion, UV unwrap the mesh in Blender or your 3D software before texturing. The OBJ format fully supports UVs you just need to create them since STL doesn't store them.
1) UV unwrap and texture the model. 2) Sculpt details in ZBrush. 3) Remix with other models in Blender. 4) Convert to FBX for game engines. 5) Add materials via MTL for rendering. 6) Convert back to STL for 3D printing after edits. OBJ opens up the full creative editing toolkit.
Absolutely. All uploads use TLS 1.3 encryption. Files are processed in isolated cloud environments and auto-deleted within 1 hour. Read our Privacy Policy for full details.
Free users: 50MB. Basic: 100MB. Pro: 500MB. Team: 1GB. Binary STL files are more compact than ASCII the OBJ output will be slightly larger due to additional normal and UV channel headers.