Convert photos and logos to printable STL instantly: outline-extruded stamps or lithophane reliefs, free online.
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Convert 2D images to 3D printable STL. Outline Extrude mode extrudes stamps and logos; heightmap mode generates lithophane light panels and photo reliefs. Adjustable resolution and smoothing, outputs monochrome geometry, ready for major slicers. Your image is turned into an STL right in the browser with no upload, so personal photos stay on your device.
Image to STL in four steps, whether you are making a logo stamp or a photo lithophane.
Outline Extrude turns logos, icons and line art into a solid of even thickness. Heightmap turns a photo into a relief or lithophane, where brightness sets the height.
Tip: Flat graphic with clear edges? Use Outline Extrude. Soft shading or a photo? Use Heightmap.
Drop in a JPG, PNG, WebP or SVG. If the background is not transparent, set Background to Remove by Color, and raise Ignore Small Specks to drop stray dots.
Tip: Crop to the subject before uploading. A busy background is the most common cause of extra shapes.
Enter Width (X) with Lock Aspect Ratio on, then set the height: Extrude Height in Outline Extrude, or Relief Height and Minimum Base Thickness in Heightmap.
Tip: For a lithophane, dark areas must be thick to block light, so keep Raise By on Dark Raised.
Rotate the preview to look for thin walls or missing parts, then download the STL and open it in your slicer. STL has no colour; for a coloured print, use Image to 3MF.
Tip: Big photos make dense files. Lower Detail if the slicer feels slow.
| Option | What it does | Default / range |
|---|---|---|
Conversion Mode | Select how the image should be converted into 3D geometry.
| Outline Extrude |
| Option | What it does | Default / range |
|---|---|---|
Width (X) | Final model width, including the base. With the aspect ratio locked, the length follows the shape's proportions and does not change with Detail. | 100mm10mm – 500mm |
Length (Y) | Locked to the width by the shape's aspect ratio. Editing it rescales the width. | |
Lock Aspect Ratio | When on, the height follows the width using the shape's proportions. Turn off to set width and height separately (the model is stretched). | on |
| Option | What it does | Default / range |
|---|---|---|
Background | By Brightness: transparent areas of a PNG are the background; opaque images are split by Threshold. Remove by Color: transparent areas plus pixels close to any picked color are removed. Keep Background: nothing is removed. By Brightness · Remove by Color · Keep Background | By Brightness |
Background Colors | Pixels close to any of these colors are removed. Add a second color for gray-and-white checkerboards or two-tone backgrounds (up to 4). | #ffffff |
Tolerance | Higher values also remove colors further from the picked ones. Raise it if a colored fringe remains or the background is uneven. | 150 – 100 |
Transparent Fill | Fill transparent areas with this color and keep the whole image. White · Black | White |
| Option | What it does | Default / range |
|---|---|---|
Threshold | Brightness cut-off (0-255) between dark and light. Higher values count more (lighter) pixels as dark; lower values keep only the darkest pixels. | 1280 – 255 |
Extrude Height | The thickness of the extruded geometry in millimeters. Controls how tall the final 3D model will be. | 101 – 100 · step 0.1 |
Edge Rounding | Rounds the top edge of the outline. The value is the radius; 0 keeps a sharp edge. | 0.50 – 5 · step 0.1 |
Rounding Segments | The number of segments used to create the bevel curve. More segments produce smoother bevels at the cost of more geometry. | 31 – 8 |
Keep Sharp Corners | Corners that turn more than this angle stay sharp and are not smoothed. Lower values keep more corners sharp. | 375 – 90 |
Detail | Controls the resolution of the generated mesh. Higher quality produces smoother surfaces but larger file sizes. | 10.1 – 2 · step 0.1 |
Base | Adds a solid base under the shape. Rectangle follows the bounding box; Follow Outline follows the shape's outline. None · Rectangle · Follow Outline · Circle | None |
Base Thickness | Thickness of the base under the shape. | 2mm0.5mm – 10mm · step 0.1mm |
Base Margin | How far the base extends beyond the shape on each side. | 3mm0mm – 20mm · step 0.1mm |
Base Segments | Smoothness of the circular base and of rounded corners on the outline base. More segments are smoother but make a larger file. | 6416 – 256 |
Base Color | Only for 3MF export: color of the base part. | #e1e1e1 |
Extract | Choose whether the dark or the light parts of the image become solid. Pick Light Parts when the subject is lighter than the background. Dark Parts · Light Parts | Dark Parts |
| Option | What it does | Default / range |
|---|---|---|
Max Colors | Maximum number of colors kept after merging similar shades. Each color becomes its own shape, which affects how the model is split (STL too) and the parts of a multi-color 3MF. | 121 – 16 |
Ignore Small Specks | Spots and holes smaller than this area are ignored. Raise it for noisy scans; lower it to keep tiny details. | 150 – 200 |
Outline Simplification | Higher values give simpler edges and fewer triangles; 0 (default) follows the image exactly. | 00 – 4 · step 0.05 |
| Option | What it does | Default / range |
|---|---|---|
Relief Height | The maximum height of the raised areas in millimeters. Controls the overall relief depth. | 50.5 – 20 · step 0.1 |
Minimum Base Thickness | Thickness at the lowest point of the relief; thicker is sturdier. In By Brightness mode, transparent areas of a PNG count as background and sit at this thickness. | 10 – 5 · step 0.1 |
Smoothing | Applies smoothing to the heightmap surface to reduce noise and stair-stepping artifacts. Higher values produce smoother surfaces. | 20 – 10 |
Detail | Controls the detail level of the generated mesh. Higher resolution preserves more image detail but increases file size. | 400100 – 400 · step 50 |
Cut Out Subject | Background areas are left out: only the subject is printed, with sides following its outline. Turn off to keep the full rectangular base. | on |
Raise By | Dark Raised suits black-and-white logos and photo reliefs; Light Raised is the opposite; Vivid Raised lifts colorful areas while white, gray and black stay flat; Custom per Color sets a height for each color. Dark Raised · Light Raised · Vivid Raised · Custom per Color | Dark Raised |
Color Heights | Set a height for each main color. Pixels use the closest color. | |
Edge Rounding | Rounds the top edge of the subject's sides; 0 keeps a sharp edge. The outline grows outward by about the radius. | 0.50 – 3 · step 0.1 |
Bottom Rounding | Rounds the bottom edge of the subject's sides; 0 keeps a sharp edge (default). The footprint stays on the outline; the upper shape grows outward by about the radius. | 00 – 3 · step 0.1 |
Rounding Segments | More segments give a smoother curve. | 31 – 10 |
In Heightmap mode, each pixel's brightness sets how tall that spot is in the STL.
stl|Open With: Slicer Software、MeshLab、Windows 3D Viewer、STL Viewer Online
Settings in this tool shape the model; how you print it decides how good it looks. These starting points work on most FDM printers.
| You are printing | Printer settings | Why |
|---|---|---|
| A lithophane from a photo | Print standing upright, 100% infill, 0.12 mm layers, white PLA. | Upright gives the smoothest light; solid infill keeps the shading even. |
| A logo plaque or sign | Flat on the bed, 0.2 mm layers, 15–20% infill. | Flat printing keeps edges crisp and prints fast. |
| A relief or embossed tile | Flat, 0.12–0.16 mm layers, slow outer walls. | Thin layers show small height steps. |
| A keychain | Flat, 3–4 walls, add a hole of at least 4 mm. | Extra walls make the ring strong enough to carry. |
For stamps/logos, use transparent backgrounds or high-contrast black-and-white images. For photo reliefs/light panels, use clear, moderately contrasted grayscale or color photos. For complex backgrounds, crop the subject first.
No. STL only stores geometry. For colored models, use 'Image to 3MF' instead; you can also paint after printing.
No area was recognized as the subject. This usually happens with near-uniform or very low-contrast images. Increase the contrast, adjust Threshold or Extract, or use Remove by Color under Background. You can also switch to heightmap mode.
In heightmap mode the mesh follows the image pixels, so a big photo creates a very dense model. Lower the resolution before converting to get a lighter file.
