Free 3D File Converter
STL to OBJ Converter
Drag in a .stl file, see it in 3D, and download a clean .obj in seconds — right in your browser. No upload, no sign-up. Review the 3D preview before downloading the converted file.
- ✓ 100% free
- ✓ Private — nothing uploaded
- ✓ Instant, in-browser
- ✓ No sign-up
No 3D file handy? Try a classic model
Click any model to load it into the converter above and convert it instantly.
Sample models from the public common-3d-test-models repository.
.stl in 3D printing & CAD export .obj out Modeling, rendering, games How to convert STL to OBJ
Drop your .stl file into the box above, click to browse, or pick a classic sample model. It loads instantly — nothing is uploaded.
Your model renders in an interactive 3D viewer. Drag to rotate and confirm it is the right mesh.
Click Convert to OBJ and download your .obj file — ready for Blender and any OBJ app.
STL vs OBJ: what's the difference?
| Feature | STL | OBJ |
|---|---|---|
| Geometry (mesh) | ✓ | ✓ |
| Color | — | ✓ |
| Materials | — | ✓ |
| UV textures | — | ✓ |
| Best for | 3D printing & CAD export | Modeling, rendering, games |
| File size | Compact (binary) | Larger (readable text) |
What is the STL format?
STL describes a 3D surface as a simple mesh of triangles. It is the universal language of 3D printing and CAD export, supported by every slicer and printer — but it stores only raw geometry, with no color, material or texture data.
What is the OBJ format?
OBJ is one of the most widely supported 3D formats in existence. Beyond geometry it can reference materials through a companion .mtl file and store UV coordinates for textures, which makes it a go-to format for modeling, rendering and game engines.
Why convert STL to OBJ?
STereoLithography (.stl): STL describes a 3D surface as a simple mesh of triangles. It is the universal language of 3D printing and CAD export, supported by every slicer and printer — but it stores only raw geometry, with no color, material or texture data.
Converting to OBJ keeps that exact geometry and unlocks color, materials and UV textures, which STL cannot store. OBJ is one of the most widely supported 3D formats in existence. Beyond geometry it can reference materials through a companion .mtl file and store UV coordinates for textures, which makes it a go-to format for modeling, rendering and game engines.
This converter does the translation locally, in your browser: your file is read into a real 3D engine, shown so you can confirm it, then re-exported as a standards-compliant OBJ — no server, no account, no upload queue.
When to convert STL to OBJ
Texturing & rendering
Open the OBJ in Blender, Substance or your renderer to add colour, PBR materials and textures the STL could not hold.
Game & real-time assets
Engines such as Unity and Unreal prefer modeling, rendering, games formats. The converted OBJ fits straight into asset pipelines.
Editing & remeshing
Need to sculpt, retopologize or repair a model? Convert to OBJ so it opens in the tools that handle that best, then export again.
Sharing & interchange
OBJ is widely supported, making it a safe format for handing a model to a teammate, client or another application.
Open the OBJ output
The exported OBJ imports into major tools for modeling, rendering, games:
- Blender
- Maya
- 3ds Max
- ZBrush
- Cinema 4D
- Unity
Tips for the best STL → OBJ results
- • Repair scans first. If your STL came from a 3D scanner, run a quick mesh repair (Blender or MeshLab) to close holes before converting.
- • Add colour after converting. STL stores no colour, so assign materials and textures in your 3D app once you have the OBJ.
- • Check scale & orientation. Different tools assume different units. After importing the OBJ, confirm the model's size and up-axis match your scene.
- • Keep the original. Conversion is one-way here, so hold on to your source STL in case you need to re-export with different settings.
Frequently asked questions
Is this STL to OBJ converter free?
Yes — completely free, no sign-up and no watermark. The conversion runs locally in your browser, so your file never leaves your computer and there is no upload wait. The optional 3D preview uses WebGL when available, but conversion does not depend on it.
Does converting STL to OBJ lose quality?
No geometry is lost — every vertex and face is preserved. STL has no color, materials and UV textures, so the OBJ starts without them, but you can add them afterward in your 3D software.
What is the largest STL file I can convert?
This route accepts STL files up to 50 MB. Conversion runs locally, so a dense model below that limit can still exceed the memory available on a phone or older computer. Simplify very large assets in a desktop 3D application first.
Where can I use the converted OBJ file?
OBJ is modeling, rendering, games. The exported file imports cleanly into Blender, Maya, 3ds Max, ZBrush and other OBJ-compatible tools.
Is it safe to convert private or proprietary models?
Yes. Nothing is uploaded — the file is read and converted on your own device, then the OBJ is generated locally for download. Your model stays private.