Free local 3D tool

OBJ to STL Converter

Open your OBJ, check the shape and choose its print size. Download an STL for your slicer. Conversion is free and happens in your browser.

Your STL preview

Open a file or try a sample to see the model here.

From OBJ to STL

OBJ geometry to STL

72.89 × 73.20 × 80 model units · 47,326 triangles

Geometry of the actual cup OBJ sample — OBJ input · derived from the prepared cup mesh

Render of the actual OBJ geometry to STL geometry — STL output · source coordinates kept

The OBJ and STL have the same shape and dimensions. Conversion removes materials; it does not repair gaps or join separate pieces.

Download sample OBJ Download example STL Back to the workspace ↑

How to convert OBJ to STL

Choose one OBJ

Load an OBJ up to 32 MB. Faces become triangles; separate MTL and texture files are not loaded by this geometry conversion.

Keep scale or choose millimeters

By default, STL keeps the OBJ coordinates. Enable Set print size to scale the longest side from 20 to 200 mm while keeping proportions.

Check the downloaded mesh

STL keeps the shape and removes colors, textures and materials. Conversion does not close holes or join detached pieces.

Questions about OBJ to STL Converter

How do I convert OBJ to STL?

Choose the OBJ, inspect its shape and dimensions, then download STL. Keep the original coordinates or enable Set print size to choose the longest side in millimeters.

Do I need the OBJ material file?

No. This converter reads the OBJ geometry without loading a companion MTL or texture directory. Standard STL stores triangles, so material colors and texture maps are omitted.

Will the STL have the same dimensions?

With Set print size off, it retains source coordinates and proportions. OBJ and STL do not declare a physical unit here; confirm the unit in your slicer. With sizing on, the longest side uses your chosen millimeter value.

Does conversion repair the model?

No. Holes, intersecting surfaces and disconnected parts can carry into the STL. Review the exported mesh and sliced layers before printing; use a mesh editor or slicer repair when needed.

Are my files uploaded, and is this free?

Your selected file is parsed and converted in this browser tab. It is not uploaded for processing. These local tools require no account or generation credits. Reloading the page clears your selected file.

Free local 3D tool

OBJ to STL Converter

Open your OBJ, check the shape and choose its print size. Download an STL for your slicer. Conversion is free and happens in your browser.

Your STL preview

Open a file or try a sample to see the model here.

From OBJ to STL

OBJ geometry to STL

72.89 × 73.20 × 80 model units · 47,326 triangles

The OBJ and STL have the same shape and dimensions. Conversion removes materials; it does not repair gaps or join separate pieces.

Download sample OBJ Download example STL Back to the workspace ↑

How to convert OBJ to STL

Choose one OBJ

Load an OBJ up to 32 MB. Faces become triangles; separate MTL and texture files are not loaded by this geometry conversion.

Keep scale or choose millimeters

By default, STL keeps the OBJ coordinates. Enable Set print size to scale the longest side from 20 to 200 mm while keeping proportions.

Check the downloaded mesh

STL keeps the shape and removes colors, textures and materials. Conversion does not close holes or join detached pieces.

Questions about OBJ to STL Converter

How do I convert OBJ to STL?

Choose the OBJ, inspect its shape and dimensions, then download STL. Keep the original coordinates or enable Set print size to choose the longest side in millimeters.

Do I need the OBJ material file?

No. This converter reads the OBJ geometry without loading a companion MTL or texture directory. Standard STL stores triangles, so material colors and texture maps are omitted.

Will the STL have the same dimensions?

Does conversion repair the model?

No. Holes, intersecting surfaces and disconnected parts can carry into the STL. Review the exported mesh and sliced layers before printing; use a mesh editor or slicer repair when needed.

Are my files uploaded, and is this free?