STL to OBJ converter
Convert STL to OBJ free online. Turn 3D print meshes into universal OBJ files with material support for Blender, Maya, and any 3D editor. No signup required.
Drop a file to convert here
or click to browse
About Wavefront OBJ
Common Use Cases
- Converting 3D print files for editing in Blender or Maya
- Adding materials and textures to STL meshes
- Sharing 3D models in a universally supported format
STL is the workhorse of 3D printing, but it only stores raw triangle geometry with no support for color, materials, or texture coordinates. OBJ is the universal 3D interchange format that supports materials via companion .mtl files and UV mapping for textures. Converting from STL to OBJ unlocks the full editing pipeline in tools like Blender, Maya, 3ds Max, Cinema 4D, and ZBrush.
STL stores only triangle mesh geometry, while OBJ supports materials, texture coordinates, vertex normals, and named object groups in a single human-readable text file.
Why Convert STL to OBJ?
Add materials and textures to 3D prints
STL files have no concept of color or material. Once converted to OBJ, you can assign materials, paint textures, and set up UV maps in Blender, Maya, or any 3D editor that supports the .mtl material format.
Edit in any 3D application
OBJ is the most widely supported 3D file format in existence. Blender, Maya, 3ds Max, Cinema 4D, Houdini, ZBrush, Substance Painter, and hundreds of other tools all import OBJ natively.
Organize complex scenes with named groups
OBJ supports named object groups and smooth shading groups, letting you split a monolithic STL mesh into logical parts that can be selected, hidden, and edited independently.
Prepare models for rendering and visualization
Renderers like V-Ray, Arnold, Cycles, and Octane all work with OBJ. Converting your STL to OBJ is the first step toward producing photorealistic renders of 3D printed parts or prototypes.
When to use each
Use STL when...
- Sending files directly to a 3D printer or slicer
- You only need raw triangle geometry
- File size matters and you want binary STL
- The slicer software requires STL input
- Exporting from CAD for prototyping
Use OBJ when...
- Editing meshes in Blender, Maya, or 3ds Max
- You need materials, textures, or UV maps
- You want named object groups for scene organization
- Sharing models that other artists need to modify
- Preparing assets for rendering or visualization
Common use cases
- Converting 3D print files for editing in Blender or Maya
- Adding materials and textures to STL meshes
- Sharing 3D models in a universally supported format
How to use
- Upload your STL file. Drag and drop a .stl file onto the upload area, or click to browse. Both binary and ASCII STL files are supported, up to 500 MB.
- Run the conversion. Click Convert File. The STL mesh is parsed and written as OBJ with recalculated vertex normals for proper shading in any 3D editor.
- Download your OBJ. Save the converted .obj file and open it in Blender, Maya, or any 3D application. Uploaded files are deleted from our servers within 1 hour.
Frequently asked questions
- Does the conversion preserve the exact mesh geometry?
- Yes. Every triangle in the STL is preserved identically in the OBJ output. Vertex positions, face winding, and topology are unchanged.
- Will the OBJ have materials or textures?
- STL files contain no material or texture data, so the converted OBJ starts with a default material. You can assign materials and textures in your 3D editor after import.
- Can I convert binary and ASCII STL files?
- Yes. Both binary STL (the more common, compact format) and ASCII STL (human-readable text) are detected and handled automatically.
- Is converting STL to OBJ free?
- Yes. Anyone can convert for free with no signup. Anonymous users get a daily allowance, registered accounts get higher limits, and Premium or Lifetime members get unlimited conversions.
- What is the file size limit?
- The maximum file size for a single conversion is 500 MB, which covers even very detailed 3D scans and high-poly meshes.