What determines the finished size?
Finished width/height is facets × drill pitch. An 80-facet-wide chart at a 2.8mm pitch finishes about 224mm wide.
Why symbols on every facet?
Diamond painting charts traditionally use one symbol per color so the pattern stays readable at a glance and in black-and-white print, in addition to the color fill.
Can I reduce the number of colors?
Not directly in this version — try a higher-contrast or more simplified source photo, which naturally reduces how many distinct palette colors get used.
Is anything uploaded?
No. The photo is processed entirely in your browser and the tool is free with no sign-in.