PNG to STL converter

How to convert PNG to STL

You can convert PNG to STL free of charge, without an account. Choose your PNG, decide between heightmap relief and outline extrusion, then set width and depth in millimeters. High detail samples up to 512 points along the longest edge. Convert and rotate the model to inspect both the silhouette and its thickness before downloading.

When converting PNG to STL, the starting image determines what the tool can make. Heightmap mode turns brightness into surface height; it does not reconstruct the hidden sides of a photographed object. Outline mode gives the foreground a uniform thickness.

Choose image-to-STL relief settings

From PNG to STL without an unwanted rectangle

Automatic background handling uses the PNG alpha channel. Transparent pixels stay outside the model, so a transparent canvas does not become a rectangular backing. A white background is still opaque: export true transparency or choose remove-white mode when appropriate.

Check the holes inside letters and any disconnected dots or accents. Separate image islands can become separate pieces. Add connecting strokes in the artwork if the final object must be one connected sign; conversion does not silently join those pieces.

Prepare a transparent PNG for a clean STL outline

What to check in a PNG to STL file

Compare the exported width with the intended size, inspect narrow bridges and look for missing small openings. A sharp source image helps, but a gap smaller than the sampled grid can still disappear. Increase the physical size or simplify the artwork when essential features are too fine.

Standard STL stores the surface geometry. It does not retain the PNG colors, the preview material or your slicer settings. After you convert PNG to STL online, reopen the downloaded model and inspect sliced layers before printing.

Open the exported STL · Use SVG artwork as an alternative input

Do I need to upload my artwork to a conversion server?

This PNG to STL online converter processes the image in your browser. No conversion upload or account is required. Raster input is limited to 20 MB and 24 million pixels; one file is processed at a time. Closing the tab releases its working conversion data.

Processing limits

Raster images: 20 MB and 24 million pixels. SVG: 2 MB. Image sampling is up to 512 points on the longest edge. Width 10–300 mm, proportional height 1–600 mm, depth 0.2–20 mm, relief base 0.5–10 mm.

One file at a time. Processing stops after 90 seconds. Files remain in browser memory, and no conversion upload is performed. Replacing a file clears the previous result. Closing the tab releases its working data.