Identicon hashes the seed text with a small FNV-1a variant, then uses the hash bits to build a 5×5 grid mirrored left-right (GitHub-identicon style) and a hue for the foreground color — the same seed always produces the same pattern and color. Initials takes the first letter of the first and last word (or just the first letter for a single word) and picks a background hue the same way, rendered as pure SVG. Placeholder draws a plain solid-color box (like placehold.co) at a custom width/height, with a custom label that defaults to the box's dimensions (e.g. "300×200") when left blank, and a font size that auto-scales to the box so large boxes don't end up with tiny text. Everything runs client-side; nothing is uploaded.