ONLINE STL CONVERTER · LOCAL · MAX 250 MB

Free Online STL ConverterConvert to STL and from STL instantly.

Q: Which STL conversions stay in my browser?

Supported OBJ and STL files up to 25 MB run in a Web Worker in your browser. STEP, FBX, GLB, ZIP, image, and repair workflows use the conversion API when local processing is not available, and the interface tells you before upload.

Q: Can I convert an STL file back to STEP or OBJ?

Yes. Switch the converter direction to From STL, or open the STL to STEP, STL to OBJ, STL to FBX and STL to GLB tools to convert an existing STL mesh.

Q: How does Image to STL (PNG, JPG, SVG to STL) work?

The Image to STL converter extrudes SVG vectors and PNG silhouettes into solid STL geometry, and maps JPG brightness levels into variable-height STL reliefs ready for slicing.

Q: How can I fix open edges or inverted normals in my STL file?

When you load or convert a file, the STL preview highlights face normals and open edges. Open Repair STL to close simple holes and make the STL file manifold.

Convert 3MF, OBJ, FBX, STEP, GLB, PNG, JPG, SVG and DXF to STL — or convert STL to STEP, OBJ, FBX and GLB. OBJ and STL use local browser processing when supported; advanced formats and repair use the conversion API with an upload notice.

Fromany STL inputTo.stl

READY

Drop your file here to convert to or from STLor click to browse · Max 250 MB

Local-first STL conversion — advanced workflows use the API.Broken mesh? Repair STL →

BUILT FOR STL WORKFLOWSLocal first.Supported OBJ and STL files stay in your browser; server workflows are identified before upload.

Local firstWeb Worker when supported

250 MB limitLarge STL input support

STL checksFace normals + open edges

STL CONVERSION MATRIX

All Supported
STL Conversions

Choose a precise STL workflow, process locally when supported, and inspect the geometry before you export it.

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Convert to STL

Turn common source formats into clean binary or ASCII STL geometry.

3MF to STLExtract raw STL triangle meshes from 3MF slicer packages.OBJ to STLConvert OBJ polygon files into printable binary or ASCII STL.FBX to STLTurn FBX models into watertight STL files.STEP to STLTessellate STEP files into high-resolution STL geometry.GLB to STLBake GLB scenes into static STL triangle meshes.ZIP to STLBatch-convert a ZIP of STL inputs into one STL archive.

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Convert from STL

Export an existing STL mesh into the format your editor or CAD workflow expects.

STL to OBJConvert STL meshes into editable OBJ files.STL to FBXExport STL files to FBX format quickly.STL to GLBCompress large STL files into web-ready GLB.STL to STEPConvert STL triangle meshes into STEP format.

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Image to STL

Extrude 2D artwork and photos into printable STL geometry.

PNG to STLExtrude transparent PNG logos and icons into STL files.JPG to STLConvert JPG photos into heightmap relief and lithophane STL.SVG to STLTurn 2D SVG vector paths into sharp extruded STL models.DXF to STLExtrude closed DXF polylines into printable STL solids.

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STL Tools

Inspect, check and repair an STL before it reaches your slicer.

Online STL ViewerPreview an STL mesh with face normals and open edges.STL CheckerCheck STL for printing, holes and non-manifold edges.Repair STL OnlineFix supported holes and winding issues before printing.

LOCAL STL PROCESSING

Why use our local-first STL file converter?

Convert STL files in your browser with a generous file limit, a live mesh preview, and checks that help you catch problems before you download or slice.

STL tool feature	Our STL converter	Cloud STL converters
STL processing mode	Local browser processing when supported; API fallback is disclosed	Uploads STL files to remote servers
Maximum file size	Up to 250 MB per STL or input file	Often capped at 50–100 MB on free tiers
Built-in STL check	Live face normal and open edge preview	Blind conversion without STL inspection
STL output quality	Clean binary STL and one-click STL repair	Raw output only

HOW TO CONVERT TO AND FROM STL

How to convert files to and from STL

Select a file or STL. Choose a source format, then drop your file into the browser-based STL converter.
Preview the STL mesh. Review the shape, face normals and open edges before you export.
Download STL or the reverse format. Export a clean STL, OBJ, FBX, GLB or STEP file for your next tool.

Need a direct route? Try OBJ to STL, STEP to STL, PNG to STL, SVG to STL, STL Viewer or Repair STL.

STL CONVERSION QUESTIONS

STL Converter FAQs

Which STL conversions stay in my browser?

Supported OBJ and STL files up to 25 MB run locally in a Web Worker. STEP, FBX, GLB, ZIP, image and repair workflows use the conversion API when needed, and the interface tells you before the source file is uploaded.

Can I convert an STL file back to STEP or OBJ?

Yes. Switch the converter direction to From STL, or use the dedicated STL to STEP, STL to OBJ, STL to FBX and STL to GLB tools.

How does Image to STL (PNG, JPG, SVG to STL) work?

PNG and SVG files become extruded STL geometry. JPG files map brightness levels into variable-height STL reliefs ready for slicing.

How can I fix open edges or inverted normals in my STL file?

Load the file in the STL Checker to review open edges and face normals, then click Repair STL to close supported holes and make the STL file manifold.

Does an STL file store scale or units?

STL does not store reliable unit metadata. Check the exported dimensions and confirm the intended scale in your slicer or CAD application.

What is the difference between STL and OBJ?

STL stores triangle surface geometry for printing. OBJ can also carry normals, UVs and material references, so it is often better for editing and rendering.