Convert OBJ to STL Online Free

Ready to Convert?

Upload your OBJ file and get a clean STL file back — free, instant, and no software to install.

Why Convert OBJ to STL?

STL strips your model down to raw triangle geometry, which is exactly what 3D printer slicers like Cura or PrusaSlicer need to generate print instructions.

Whether you're preparing assets for 3D printing or just need a format your current tool will accept, converting from OBJ to STL takes the compatibility guesswork out of your workflow.

Source Format

.OBJ — Wavefront OBJ

Wavefront OBJ is a simple, universal geometry format supported by nearly every 3D application on the planet.

Commonly used in: Blender, Maya, 3ds Max, ZBrush, and most 3D printers and viewers

Target Format

.STL — Stereolithography

Stereolithography is the standard mesh-only format used almost universally in 3D printing.

Commonly used in: 3D printers and slicers like Cura, PrusaSlicer, and Bambu Studio

How to Convert OBJ to STL

Upload Your OBJ File

Drag and drop or browse to select your OBJ file. Max file size is 200MB.

Select STL as Output

STL is pre-selected for you automatically on the converter page.

Download Your STL File

Click convert and download your file in seconds. Files auto-delete after 1 hour.

Common Use Cases

Preparing OBJ assets for import into tools that only accept STL
Cleaning up geometry and materials while switching to a more compatible format
Moving models between universal interchange between apps and 3D printing workflows
Sharing a STL file with a collaborator whose software doesn't support OBJ

Frequently Asked Questions

Upload your OBJ file to Convert3D, choose STL as the output format, and click Convert. Your STL file will be ready to download within seconds.

Yes. Convert3D converts OBJ to STL for free with no signup, no watermark, and no conversion limits.

Convert3D preserves geometry, materials, and embedded textures wherever the STL format supports them. Some attributes may not carry over if STL does not support that data type.

The maximum file size for conversion is 200MB.

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