ImageToSTL.online

ImageToSTL.online converts PNG and JPG photos (and more) into watertight STL models for 3D printing—directly in your browser. No upload required, and you can start by dropping an image in, pasting from your clipboard, or choosing a sample.

Use different modes to match your print goal: photo relief (brightness mapped to height), logo extrude (silhouette-style badges), lithophane (backlit-style relief), or keychain (including a small circular keychain option). Sliders let you tune size and relief depth while a live 3D preview rebuilds as you adjust settings.

When you’re ready, download the exported watertight binary STL and open it in your slicer. The tool provides STL output in millimeters and supports export options designed for common maker workflows.

Is this image-to-STL converter really private and does it upload my file?

No upload is required—everything runs in your browser so your image stays on your device.

Which image formats can I convert to STL?

You can drop in PNG, JPG, WebP, SVG, GIF, and BMP.

What can I make with the different modes (relief, extrude, lithophane, keychain)?

Relief maps brightness to height for photo-style embossing, extrude creates logo-style 3D badges, lithophane is built for backlit relief effects, and keychain outputs a small keychain-friendly shape.

Are the exported STL files watertight and printable?

Yes—exports are provided as closed, watertight binary STL meshes in real millimeters.

How do I get the opposite height effect for relief-style prints?

Use the “Invert” option (dark = high) to flip which tones rise versus stay low.

Where can I open the downloaded STL after exporting?

You can download the STL and open it in slicers like Bambu Studio, Cura, or PrusaSlicer.