Image to STL Converter

Turn any picture into a printable 3D relief: bright pixels become raised, dark stay low, on a solid base — perfect for logos, plaques and lithophane-style prints.

Heightmap reliefSolid printable baseFreeNo sign-up

How the image becomes 3D

Your image is converted to grayscale and mapped to height: white = 5 mm raised, black = base level, on a 1 mm solid base, 100 mm wide. The result is a watertight mesh with proper walls — sliceable immediately. High-contrast images with clean shapes (logos, silhouettes, text) work best; for backlit lithophanes, invert the image first so dark areas print thick.

Frequently asked questions

What image works best for STL conversion?
High-contrast images with clean edges: logos, text, silhouettes, coins. Busy photos produce noisy surfaces — bump the contrast and simplify the background before converting.
How big is the printed model?
The relief is normalized to 100 mm wide with 5 mm of height range on a 1 mm base. Scale it freely in your slicer — the proportions stay correct.
Is this converter free?
Yes — up to 10 conversions a day and files up to 25 MB, no account needed. Larger files (up to 60 MB) and high-detail STEP output use credits ($9 for 20). Everything runs server-side on real geometry kernels, and failed jobs auto-refund.
What happens to my files?
Files are uploaded only to run your conversion and stored briefly so you can download the result. We don't share them, mine them or train on them. See our privacy policy.