WebP to printable STL: transparent stamps or heightmap reliefs, free online.
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This tool converts WebP, the modern web image format, into a 3D-printable STL file. If the image has transparency, contour mode extracts a stamp or silhouette; photos can be turned into a heightmap for a relief or lithophane. Lossy and lossless WebP are both supported, and everything runs locally in your browser so your files never leave your device.
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.
Drag in a WebP: transparent WebP works well for stamps and silhouettes; if you see lossy artifacts, raise the source image quality first.
Pick contour or heightmap mode, then adjust the resolution to balance detail and polygon count.
Download the STL file, ready to slice and 3D print.
In contour mode, transparent areas are cut out, leaving only the opaque subject, which is perfect for stamps and silhouettes. In heightmap mode, brightness drives the relief, and transparency behavior follows the live preview.
The workflow is identical; the differences come from the source format. WebP combines a smaller file size with optional transparency, PNG transparency is more common in exported designs, and JPEG photos are everyday images without transparency.
Yes. Heavy lossy compression can leave noise or blocky artifacts on the heightmap surface. Export at a higher quality, or switch to a PNG or high-quality JPEG before converting.
No. The STL format stores only geometry and no color information, so the result is always a single-color model. For a colored print, use the "WebP to 3MF" tool, or paint the model after printing.
The browser decodes an animated WebP as a single frame, so only the first frame is converted. If you need a predictable result, export the desired frame as a static image first.
A low-resolution or heavily compressed WebP blurs the edges, and contour detection relies on the effective resolution of the image. Export the largest size available with a high quality setting; for logos, prefer a lossless WebP or PNG source.
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