What is a lithophane?

A lithophane is a thin 3D printed panel whose thickness varies with image brightness. It looks like a relief in normal light, but reveals the full photo when backlit. Print it vertically in white PLA at 100% infill for the best result.

What settings should I use for 3D printing a lithophane?

Use white or natural filament, 100% infill, 0.12 mm or finer layer height, and print the panel vertically. A thickness range of 0.8 mm to 3 mm gives strong contrast when backlit.

Can I convert a logo to STL for 3D printing?

Yes. Use Relief mode with a high-contrast version of the logo. Light areas are raised and dark areas stay low, so a black logo on a white background becomes a clean embossed plate. Use the Invert switch to emboss or deboss.

Image to STL Converter - Free Online Photo to STL for 3D Printing

How to convert an image to STL

Three movements, half a minute, no account. Brightness becomes height; a picture becomes a sculpture.

I.

Upload your image

Drop a JPG or PNG into the studio. Portraits, logos, sketches and heightmaps all sit well - strong contrast carves cleanest.

II.

Shape the 3D model

Choose Relief for embossed plaques, or Lithophane for panels that glow when backlit. Every slider answers in the vitrine at once.

III.

Download the STL file

One click writes a watertight binary STL, ready for Cura, PrusaSlicer, Bambu Studio - or the CNC and CAD room.

A photo to STL converter of quiet virtues

Most image to STL tools carry your pictures off to a server. This one works like a private studio - the mesh is cut on your own machine, which makes it swifter, and discreet by design.

Nothing uploaded

Your images are processed entirely in the browser. Nothing crosses the network - safe for family photographs and unreleased marks.

Watertight STL

Every export is a closed, manifold solid: level base, sealed walls, unbroken surface. It slices without a single repair.

A living preview

Turn the piece in the vitrine before you commit. What you see is precisely the geometry written to the file.

Relief & lithophane

Emboss artwork and emblems in raised relief, or cast the classic backlit lithophane with an adjustable range of thickness.

True millimetres

Width, height and base are set in real mm. The STL arrives in your slicer at its intended size - no rescaling, no guesswork.

Free, without asterisk

No watermark, no limit, no premium tier. Convert as many images to STL as you please.

What does "image to STL" actually mean?

An STL file (Standard Triangle Language) describes a solid as a mesh of triangles - the lingua franca of 3D printing, opened by every slicer and most CAD software. A flat picture owns no depth, so an image to STL converter must invent the third dimension. It does so with an idea sculptors have trusted since antiquity: light becomes height.

The heightmap method

The converter reads your image as a grayscale heightmap. Each pixel's luminance is mapped to a height in millimetres: in Relief mode the bright passages rise to the full relief height while the shadows rest at the base - exactly as a carver leaves the highlights proud of the stone. Neighbouring samples are joined into triangles, then side walls and a level bottom are added, so the result is a solid, printable object rather than a paper-thin shell.

Relief and lithophane, two old arts

A relief is made to be seen in raking light - embossed plaques, medallions, coasters, CNC carvings. A lithophane reverses the mapping: darker pixels become thicker material. Held before a lamp, the thick passages hold back the light and the thin ones glow, and the photograph reappears in shades of luminance - a trick nineteenth-century porcelain workshops used to imitate carved marble. The Invert switch trades either mapping for its mirror in one click.

Counsel for a fine result

Prefer images with honest contrast and a calm background. For emblems and logos, a pure black-on-white version carves most cleanly. For portraits bound for lithophane, crop close and raise the smoothing a step to quiet JPEG noise. When fine detail matters, choose the Museum mesh before you carve.

Printing your lithophane

Lithophanes are the most beloved reason to convert a photo to STL, and a few settings decide everything:

Filament: white or natural PLA passes light most evenly. Infill: one hundred percent, always - a hollow reads as a bright flaw. Layer height: 0.12 mm or finer keeps a face a face. Orientation: print the panel standing, so the layer lines run across the image rather than blurring it. Thickness: the default 0.8-3.0 mm range gives deep contrast; go toward 4 mm for a strong LED behind it.

Set the finished panel before a warm lamp and the flat print becomes a photograph made of light - a favoured gift for weddings, anniversaries, and portraits.

Image to STL - questions, answered

What makers ask most often before converting images to STL files.

How do I convert an image to STL?

Upload a JPG or PNG, choose Relief or Lithophane, adjust the sliders while watching the preview, then click Carve the STL. The file is written instantly in your browser.

Is this image to STL converter really free?

Yes - entirely free, with no signup, watermarks or limits on conversions.

Are my images uploaded to a server?

No. All processing happens locally in your browser. Your photographs never leave your device.

What image formats are supported?

JPG, PNG, WebP, GIF and BMP. A PNG with a clear subject and good contrast usually yields the finest model.

Is the exported STL watertight and printable?

Yes. The mesh is a closed manifold solid - level base, sealed walls, unbroken top - and slices without repair in Cura, PrusaSlicer, Bambu Studio and others.

What settings suit a printed lithophane?

White PLA, 100% infill, 0.12 mm layers, printed standing. Keep the thickness between roughly 0.8 and 3 mm for deep backlit contrast.

Can I convert a logo to STL?

Yes - use Relief mode with a high-contrast black-and-white logo. Toggle Invert to choose embossed (raised) or debossed (recessed).

Can I use the STL for CNC carving?

Certainly. The same heightmap solid imports into CAM software for relief carving, and serves as a displacement reference in Blender or Fusion 360.

Ready to carve your image into STL?

Your photograph never leaves this page. The first model is thirty seconds away - and the studio never closes.

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