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3DAI
Free · all tools run in your browser

STL File Converter: All Free STL Tools

Pick the conversion you need. Every tool on this page runs inside your browser: files are not uploaded, there is no signup and no credits are used. Only the AI generators at the bottom use credits.

Convert to STL

Turn other 3D files into a printable STL.

Convert STL to other formats

For games, AR, CAD and laser cutters.

Make an STL from an image or text

Flat prints, reliefs, lithophanes and lettering.

STL tools

Check and fix a file before printing.

3D viewers

Open a model in the browser.

Other 3D conversions

Between GLB, glTF, OBJ, FBX, 3MF and more.

Want a full 3D model instead?

This page makes flat, layered prints from an image or text. For a real 3D object (a figure, a vase, a toy) our AI generators build one from a photo, a sketch or a sentence, with an STL download. They use credits; this tool does not.

Image to STL →A full 3D object from one photo.Sketch to STL →Draw it, get a printable model.Text to STL →Describe it in a sentence.

Frequently Asked Questions

STL is the most common file type for 3D printing. It describes a surface as a list of triangles, with no colour or materials, and every slicer can read it.
OBJ, GLB, glTF, 3MF, PLY, FBX, DAE, STEP, DXF and SVG, plus images (PNG, JPG) and typed text through the maker tools.
Yes: OBJ, GLB, 3MF, STEP, FBX, PLY, SVG, DXF and PNG each have their own page.
No. All the converters on this page read and write files locally with three.js. Nothing is sent to our servers.
You can scale it, reduce its triangle count and measure its volume with the tools above. For modelling changes use a CAD tool such as Blender, Tinkercad or Fusion.