Keep the source local
Choose an image you have permission to reproduce. The generator reads the file in the browser, reduces it to the selected output width, and maps colors to a fixed block palette. The source is not sent to a server.
Balance detail and build effort
A smaller width is easier to build and produces stronger large-scale shapes. Increase the width when small features matter, then review the material counts before starting.
Treat the result as a plan
The exports include a color-plan PNG, a multi-material Litematic, and a 1200 by 675 share card with the measured dimensions and block count. Use them as references and keep the original artwork rights separate from the generated block layout.