Converts every line to the target unit. Categories: length (m, km, cm, mm, µm, nm, mi, yd, ft, in, nmi), mass (kg, g, mg, t, lb, oz, st), temperature (°C, °F, K), speed (m/s, km/h, mph, kn, ft/s), US volume (l, ml, m³, gal, qt, pt, cup, fl oz, tbsp, tsp), area (m², km², cm², ha, acre, ft², in², mi², yd²), time (ms, s, min, h, d, wk) and CSS lengths (px, pt, pc, in, cm, mm, Q, em, rem, vw, vh using the base font and viewport below). Long names and plurals are accepted; a unit that exists in two categories (in, pt) follows the other unit. Factors are exact definitions; results are rounded to the chosen decimals. Everything runs locally.