Why the top third matters
iOS and Android paint the clock, date and notifications over the upper part of the lock screen, and app labels over the home screen. White system text needs a darker area behind it. If that zone is bright or busy, the text simply disappears.
Dim the image a little
The simplest fix is a subtle dark overlay — roughly 15–30% black — across the whole wallpaper. It barely changes the mood but makes white text pop. In the PicLoy editor, the "Auto-dim for readable text" button measures the brightness under the clock and applies exactly enough dimming for you.
Keep the subject out of the clock zone
When you crop, place the main subject — a face, a landmark, a bright flower — in the lower two-thirds so it isn't fighting the clock. Turn on "Show clock & widget zones" in the editor to see exactly where iOS and Android will place them before you download.
Blur or calm the home screen
App icons and their labels need a quieter background than the lock screen. A slight blur, or a lower-contrast version of the same image, keeps them readable. Many people pair a detailed lock screen with a blurred or muted home screen — see our guide on lock vs. home screen wallpapers.
Pick forgiving areas
Even, mid-to-dark regions are the easiest to read over. Avoid fine patterns and sharp light-to-dark edges directly under the clock — high-frequency detail there is the single hardest thing for text to sit on.