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. Sign-in is required only when you download or copy an output, which uses 1 credit.