PNGtoSTL | Convert PNG to STL Free Online Tool

Heightmap Mode

Heightmap mode in PNG to STL conversion examines your 2D PNG or JPG image and creates variable-height 3D models based on pixel brightness. Each pixel's luminosity determines its height in the 3D model - darker pixels are lower, lighter pixels are higher. Perfect for creating detailed terrain, relief sculptures, and depth-based 3D models from heightmap images.

Extrude Mode

Extrude Mode in PNG to STL conversion detects edges in your image and generates clean, simple 3D models by extruding along those contours. Perfect for straightforward designs. Extrude Color mode produces similar clean models but uses pixel colors directly in the final output instead of adjusting height based on brightness.

1. Snowflake (Extrude)

This snowflake pattern showcases how Extrude mode works in PNG to STL conversion. White pixels are extruded to 0mm height while black pixels remain at 10mm, resulting in clean geometric structures.

2. Hebrus Valles (Heightmap)

This complex heightmap of flooded impact craters in Hebrus Valles illustrates how Heightmap mode works in PNG to STL conversion. All pixels gray shades proportionally represented in the final STL 3D model.

3. Inverted Snowflake (Extrude)

Here, we use the same image as in the first example and choose the "Invert Output" checkbox option. This reverses the resulting geometry and may be useful in Cookie Cutter.

Tool Mode

Choose between Extrude (Contour) mode for clean edge-traced logos and icons, or Heightmap mode for detailed 3D models based on image brightness in your PNG to STL conversion.

Extraction Target

Specify whether to create the 3D model from the dark or light parts of your image during PNG to STL conversion. Essential for getting the right parts raised.

Color Threshold

Adjust the sensitivity of color detection in PNG to STL conversion. This helps fine-tune which pixels are included in the 3D extraction process.

Thickness & Depth

Control the physical depth of the extruded parts or the overall thickness of the 3D object in millimeters.

Bevel & Segments

Add rounded or slanted edges to your 3D model. Bevel segments control how smooth and curved these edges appear.

Angle Threshold

A safety setting that protects sharp corners from being overly smoothed, ensuring your 3D model retains its intended shape.

Quality & Detail

Set the overall precision of the mesh. Higher values result in more triangles and finer details but larger file sizes.

Model Size

Set the final physical dimensions (width/height) of your model in millimeters, ready for your 3D printer's slicer.

Max Height (Z-axis)

In Heightmap mode, this defines the maximum vertical displacement. Darkest pixels stay low while brightest pixels reach this height.

Base Thickness

Add a solid bottom layer to your model. This provides a stable foundation for 3D printing and prevents delicate parts from failing.

Smoothing

Apply a filter to reduce surface noise and 'spikes' caused by image artifacts, resulting in a cleaner, professional-looking print.

Invert Colors

Flip the heights: dark becomes high and light becomes low. Perfect for creating lithophanes (3D photos that reveal detail when backlit).

Extrude & Heightmap Modes

Convert PNG to STL using Extrude mode for clean edge tracing or Heightmap mode for variable-height 3D models based on pixel brightness. Choose the best PNG to STL conversion method for your image.

Adjustable Detail Levels

Control the resolution of your 3D conversion with Low, Medium, or High detail settings. Medium works great for most PNG to STL conversions, while High is perfect for complex images.

Background Removal

Automatically remove backgrounds from your PNG images during PNG to STL conversion. Specify background color manually or let our tool detect it automatically for cleaner 3D models.

Add 3D Base Support

Add a solid base to your PNG to STL converted model for better 3D printing stability. Specify base height in your preferred unit of measurement.

Color Support

Convert color PNG images to STL with color data preserved in PNG to STL conversion. Use Extrude Color or Heightmap Color modes to create colorful 3D models suitable for color-capable 3D printers.

Multiple Format Export

Export your PNG to STL conversion in various formats including STL (binary/ASCII), OBJ, DAE, GLB, FBX, and 3MF. Perfect for different 3D printing and modeling workflows.

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