How To Download the image from the web
Find the image on the web using the Internet browser on your phone.
View it in full size.
Long tap on the image to get a pop-up menu. Now, you can either select Save image or Set as wallpaper.
If you select Set as wallpaper, then you’re done and have the image appears as wallpaper.
But to crop or use the image as lock screen wallpaper, you need to select Save image. And the image will be downloaded to the /download folder.
On your phone, go to My Files > Download and tap the image file to enlarge it.
Press the Option key (located beside the Home key), and select Set picture as.
You’re prompted with options of Home and lock screens, Home screen wallpaper, or Lock screen wallpaper. Just select an option you prefer.
Here, you’re given the option to crop the image. Adjust the crop marquee and tap Done when you finish.
Wallpaper in All Samsung Galaxy