Image to STL Converter by Glintmake

Image to STL Converter by Glintmake turns a PNG, JPG or WebP into a binary STL in millimetres, in three modes: relief (brightness becomes height), extrude (anything darker than a threshold is raised to one height, for logos, text and silhouettes) or lithophane (a thin plate that shows the picture when lit from behind). You set the width, raised height, base thickness, threshold and detail, and check a 3D preview before downloading. Everything runs in the browser: the image is never uploaded and there is no sign-up.