Wallpaper Resizer & Cropper
Pick your phone, drag the crop to where you want it, and get an image sized exactly for that screen — with the extra width Android launchers use for the parallax pan, if you want it.
🔒 Your image is cropped and resized inside your browser. It is never uploaded, and the file you download is generated on your own device.
Saved straight from your browser — nothing is sent anywhere.
Why resizing a wallpaper is not just scaling it
A phone screen is roughly 9:20. Almost nothing else is. Photographs from a camera are 3:2 or 4:3, screenshots from a laptop are 16:10, and images pulled off the web are whatever the site felt like. When any of those meet a phone, the system scales the picture until it covers the screen and throws away everything that hangs over the edge — which is why the subject of a landscape photo so often ends up half out of frame.
Doing the crop yourself means you choose what survives. The position sliders above move the crop window; the zoom slider lets you push in further than a plain fit. What you download is exactly what your phone will show, with no second guess from the launcher.
The parallax overscan
Most Android launchers scroll the wallpaper slightly as you swipe between home-screen pages. To have something to scroll to, they need an image wider than the screen — conventionally about 20% wider. Tick the parallax box and the output is widened accordingly, so the pan reveals more picture instead of stretching what is there. Leave it off if you use a single home screen, a launcher with the effect disabled, or you are making a lock-screen image, where there is no pan at all.
Upscaling, and when to accept it
If your source image is smaller than the target, the tool will say so. Enlarging adds no detail — it interpolates pixels that were never captured — and the result looks soft, most visibly on fine texture like fur, foliage and text. A modest stretch of 10 or 20% usually passes unnoticed on a phone held at arm's length. Doubling does not. If the warning appears and you have any larger version of the picture, use that instead.
Which format to pick
- JPEG suits photographs. Its artefacts hide well in texture and the files are small. Avoid it for images with large flat gradients — skies and dark backgrounds — where it produces visible blocking.
- PNG is lossless and the safe choice for illustration, flat colour and anything with hard edges. Files are considerably larger, which matters little for a single wallpaper.
- WebP generally gives the best size-to-quality ratio of the three and is fully supported by modern Android. It is the sensible default unless you need to hand the file to something older.
The longer version of all of this — resolution, pixel density, aspect ratios and the arithmetic behind them — is in how to size an image correctly for your screen. To find your own phone's exact resolution, the display database lists it, and once you have a crop you like, the contrast checker will tell you whether your clock will still be readable on it.
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