Depth Paper

Checker · Photo in, nothing out

Check a wallpaper for the depth effect: the parts you can fix

Pick a photo and your phone model. The page gives an exact resolution verdict against that model's native pixels, draws labeled bands for the status bar, clock and widgets at its proportions, and measures the contrast of the image behind the clock. The photo is decoded and measured entirely in your browser and never leaves your device.

Image— Device— Size— Clock-band contrast— Subject band—

Your phone's own subject segmentation decides whether the depth effect switches on, and no site can run that model. This page checks the three failures you can fix: size, placement and clock-band legibility. The final call happens on the phone, so set the wallpaper there to see the result.

How this checker works

Three things are measured. First, size: your image's width and height are compared with the selected model's native panel resolution, from the same device table the wallpaper maker uses, where every entry is cross-checked against two independent published sources. An image equal to or larger than the panel in both dimensions passes. One smaller in either dimension fails, because the phone has to upscale it, and upscaling softens fine detail. Second, geometry: the overlay marks the status bar, the clock, the widget row and a subject zone as labeled wireframe bands, at the selected model's proportions. Third, legibility: the average brightness of the image behind the clock band, expressed as a contrast ratio.

The page maps the image the way the phone does when it sets a wallpaper: the image is scaled to cover the panel and centered, and the clock band is projected through that same cover-fit onto your actual pixels. Inside that region, brightness is sampled on a grid of up to 64×64 points and averaged with the standard relative-luminance formula. The reported ratio compares that average with a white clock and with a black one and keeps the better result. On iPhone models the bands come from the layout's point measurements (status bar 0–60 pt, clock 110–210 pt, widgets 220–290 pt), scaled to native pixels. Camera photos are drawn in their EXIF orientation, so a portrait shot is judged in portrait.

The iPhone band positions are approximations, recorded 2026-08-09 from published layout measurements, and they are close enough for placement guidance, which is all the bands are for. On Android phones the bands use typical proportions of the screen height instead. You judge subject placement by eye against the band shown, because only you know what the subject of your photo is.

Frequently asked questions

Why isn't depth effect working even though my photo looks fine?
Your phone decides. Its subject segmentation model has to find a clear subject before the clock will layer behind it. This checker covers the three causes you can fix: an image smaller than your screen's native pixels, a subject outside the band where the layering happens, and a clock area too busy or too mid-toned to read. If all three look right and the phone still declines, the segmentation isn't finding a subject it trusts, and a photo with a cleaner outline will do better.
Is my photo uploaded to check it?
No. The photo is decoded, drawn, and measured entirely inside this page. The site's security policy makes your browser block requests to every other origin, so nothing you select here can leave your device.
What do the outlined bands mean, and why don't they look like my lock screen?
They are neutral, labeled guide boxes: where the status bar sits, where the clock digits render, where widgets go, and the zone where a subject's top edge should land for the layered look. The page draws no system clock, no system fonts, and no hardware outlines. The bands are plain wireframes at the right proportions for the model you picked, and they are there to guide placement.
What does the clock-band contrast number mean?
It is the contrast ratio between your image's average brightness behind the clock band and a white or a black clock, whichever scores better. The phone picks the clock tone itself, so this is the best case the system could get on this image. The math is the standard relative-luminance formula from accessibility guidelines: 4.5:1 or better reads clearly, and below about 3:1 the clock tends to wash out.
Does this work for Android phones too?
Yes. The resolution verdict compares your image exactly with any listed model's native panel, Android phones included. The band overlay is approximate on Android, because lock-screen layouts vary by maker and launcher.

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