PNG → Printable STL: contours for stamps, or heightmaps for reliefs & lithophanes. Free online.
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Designed for PNG images, the tool uses transparent channels to extract precise contours, making it ideal for stamps and logos. For regular photos, the heightmap mode converts them into reliefs or lithophanes. You can adjust the resolution before exporting the STL file, and all processing is done locally in your browser.
Source graphic: 1024×1024 alpha-channel logo
Contour mode: Max height 3.5mm, base 1.5mm, 32,840 triangles
Heightmap mode: Max height 6.0mm, base 1.0mm, 98,400 triangles
DefaultContour
Select how the image should be converted into 3D geometry.
Generates solid shapes with uniform thickness from image outlines. Ideal for stamps, logos, nameplates, and other uniform-thickness objects.
Creates a relief surface based on image brightness, so brighter areas are raised and darker areas are recessed. Perfect for photo reliefs, terrain models, and artistic surfaces.
DefaultOff
Swap which parts of the image become solid and which become empty. Useful when the background is lighter than the subject.
Default128
Range0 – 255
Controls the brightness cut-off point that determines which pixels become solid geometry. Lower values include more pixels as solid; higher values only include the darkest areas.
Default10
Range1 – 100
The thickness of the extruded geometry in millimeters. Controls how tall the final 3D model will be.
Default0.5
Range0 – 5 · step 0.1
Adds rounded edges to the contour shape for a smoother, more polished finish. Higher values create more rounded edges.
Default3
Range1 – 8
The number of segments used to create the bevel curve. More segments produce smoother bevels at the cost of more geometry.
Default0.8
Range0 – 1 · step 0.1
Preserves sharp corners and fine details by controlling the angle threshold. Lower values protect more detail; higher values smooth more aggressively.
Default1
Range0.1 – 2 · step 0.1
Controls the resolution of the generated mesh. Higher quality produces smoother surfaces but larger file sizes.
Default5
Range0.5 – 20 · step 0.5
The maximum height of the raised areas in millimeters. Controls the overall relief depth.
Default1
Range0 – 5 · step 0.5
The thickness of the flat base plate beneath the relief. A thicker base provides more stability for printing.
Default2
Range0 – 10
Applies smoothing to the heightmap surface to reduce noise and stair-stepping artifacts. Higher values produce smoother surfaces.
Default400
Range100 – 400 · step 50
Controls the detail level of the generated mesh. Higher resolution preserves more image detail but increases file size.
DefaultOff
Swap the height mapping, so brighter areas become recessed and darker areas become raised.
Import transparent PNG artwork or grayscale heightmap data.
Define solid baseplate thickness and maximum relief elevation values.
Control whether dark or light pixels extrude higher with mesh smoothing.
Generate and download watertight STL for resin or FDM 3D printing.
For stamps/logos, use transparent or high-contrast black-and-white images. For reliefs/lithophanes, use clear, moderately contrasted grayscale or color photos. Crop out complex backgrounds first.
In contour mode, transparent areas typically generate no geometry (hollow), leaving only the opaque subject, ideal for stamps and silhouettes. In heightmap mode, brightness determines thickness; transparency is processed as previewed.
No. STL only stores geometry. For colored models, use the 'PNG to 3MF' converter, or paint after printing.
Contour mode solids can usually be sliced directly in Cura, PrusaSlicer, Bambu Studio, etc. For reliefs/lithophanes, check the base thickness and minimum wall thickness, add supports if needed.
Contour mode extracts regions by brightness, so a busy or colored background, or anti-aliased edges, can produce stray shapes. Crop the subject, use a clean transparent background, and adjust the threshold to ignore faint areas.
The exported file is written in millimeters. The vertical settings (depth, max height, base thickness) are mm, but the horizontal footprint follows the image's pixel grid, so check the size in your slicer and scale the model to the dimensions you need.
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