Transparent background — Your logo should use a transparent PNG or SVG, not a white/colored background box.
No near-black elements on dark backgrounds — Dark navy, dark grey, or black logo elements will vanish on dark UIs.
Sufficient contrast ratio — WCAG recommends at least 3:1 for logos and 4.5:1 for any text within the logo.
You have a light-only logo variant — Brands should maintain a white/light version specifically for dark backgrounds.
SVG preferred over PNG — SVGs are infinitely scalable, lighter, and support CSS theming for automatic mode switching.