STLGenie

Lithophane Maker — Turn a Photo into a Backlit 3D Print

Who this is for: For gift-makers and photo printers: grandparents' portraits, wedding moments, pet photos — images that hit differently as a physical object that needs light to reveal.

Turn a photo into a lithophane: a 3D-printed panel that reveals the image when backlit. AI builds the relief, you download the STL and print it thin. 2 free models a day.

Quick answer: The lithophane maker turns a photo into a 3D relief panel that reveals the image when backlit: AI builds the mesh, you preview it in 3D, download the STL and print it thin (2-4mm) in white filament. First model each day is free.

Image to 3D model

2/day free
Choose an imagePNG / JPG / JPEG / WebP — one clear subject works best

AI reconstruction · STL + GLB downloads · the image is prepared locally in your browser

Core facts
InputOne photo up to 10MB — portraits and clear-lit scenes work best
OutputSTL relief panel (print thin, 2-4mm) + GLB color preview
Print recipeWhite/light PLA, 0.1-0.16mm layers, print vertical or flat — test at 80mm first
PrinterAny FDM printer, single color, 0.4mm nozzle — no special hardware
Free tier2 free models a day, no account
PrivacyPhotos never stored — result link expires in 24 hours

What a lithophane is, and how this maker builds one

A lithophane is a 3D-printed panel whose thickness varies with image brightness: bright areas are printed thin (light passes through), dark areas thick (light is blocked). Held against a lamp or window, the flat white print reveals the photo. Printers have been making them since before resin printers existed — they are the oldest 'magic trick' in 3D printing, and still the one that gets the strongest reaction.

The classic technique is what this maker uses: the AI reconstruction model looks at your photo and models the depth relief — faces and subjects raise from the panel's surface, and the print reads as a relief sculpture up close and as a photo when backlit. Preview it in 3D before downloading; the STL prints on any FDM printer.

Two settings make or break a lithophane, and neither is in the file — they are in your slicer: print thin (2-4mm base with the relief on top is the common recipe), and print vertical or flat per your test. White or light-gray filament behaves best; thickness is doing the work, not color. A first test print at 80mm wide tells you more than any guide — then scale up the keeper.

Common uses

  • Grandparent portraits as night-light panels
  • Wedding photos as anniversary gifts
  • Pet memorial prints that light up
  • Baby photos as nursery night lights
  • Cityscape or landscape shots as window art

Why lithophanes still beat flat photo prints

A flat printed photo is looked at; a lithophane is picked up, tilted and held to the light — it is a small physical event. That is why they remain the most-repeated 'I printed this?' moment in the hobby. Print two: one for the shelf, one for whoever tries to pocket it.

Frequently Asked Questions

How thick should a lithophane print be?
The common recipe: 2-4mm total thickness range, printed with the relief toward the light. Too thin and it is fragile and washes out; too thick and the light cannot carry. Print a small test at your usual layer height (0.1-0.16mm layers read best) before committing to a large panel.
Which filament color works best?
White, natural or light gray PLA — the print reveals the image through thickness, so color only tints the result. Dark or translucent filaments fight the effect. Matte white is the classic answer.
Do I need a special printer?
No — any FDM printer with 0.4mm nozzle prints lithophanes, and resin printers can too (they shine with small, detailed ones). No AMS, no multi-color, no special bed: a single white spool is the entire requirement.
How does converting an image to STL actually work?
An AI 3D reconstruction model looks at your image the way a sculptor reads a photo: it infers depth and shape from shading, perspective and familiar objects, then generates a triangle mesh matching what it inferred. The mesh is delivered as a 3D file you preview here and download — as STL for printing, or GLB to keep the color.
What makes a good input image?
A single object, clearly lit, filling most of the frame, shot from a slight angle rather than dead-on. Simplify backgrounds help the model separate object from noise. Portrait photos with clear lighting make the strongest lithophanes. Photos of people work for figurines; flat artwork works for coasters and stamps; product shots work for miniature replicas.
Is the result printable right away?
Usually it needs a slicer health check like any generated mesh: open it in Bambu Studio / PrusaSlicer / Cura, run the repairs if any are flagged, and check wall thickness and scale. The STL you download is a real triangle mesh, not a placeholder — but there is no such thing as an AI mesh guaranteed watertight, so 30 seconds in your slicer's repair dialog is the honest advice.
Can I keep the colors?
Not in STL — the format stores pure triangle geometry, by design. That is why every result also offers a GLB download: GLB keeps texture and color, and it is what you want for painting, rendering or web viewing. For most 3D-printing workflows, color comes from the filament you load, not the file.
What does it cost?
Every day includes 2 free full-quality models (no account, no watermark). After that, credit packs: 3 models for $1.99, 10 models for $4.99, 30 models for $12.99. These fund the GPU time the reconstruction model needs — that part cannot run in your browser, unlike the format converters elsewhere on this site, which are free and unlimited.
Where is my image stored?
Nowhere. Your image is resized locally in the browser and passed through our server to the reconstruction engine only to produce your model. We keep no copy — and the result link expires after 24 hours, so download it when it is ready.

More guides

How to Convert an Image to STL

The full path from a photo or PNG to a printable STL: what the AI model actually does, what to check in your slicer, and the settings that matter.

More related tools

PNG to STL

Drop a PNG, get a printable 3D model — AI reconstruction turns the picture into a triangle mesh you preview in 3D and download as STL or GLB. 2 free models a day.

JPG to STL

Upload a JPG photo and get an STL model of its subject — AI builds the mesh, the page previews it in 3D, and the download is slicer-ready. 2 free models a day.

JPEG to STL

JPEG images to printable STL models — same pipeline as JPG, with a note on why export quality matters for reconstruction. 2 free models a day.