4K Wallpaper REST API for Ultra HD Mobile Apps
NexWall 4K Wallpaper API provides direct programmatic access to thousands of curated Ultra HD mobile wallpapers (2160×3840 native portrait resolution). Every JSON response provides dual URLs: a high-compression WebP thumbnail for fluid 120 FPS infinite grid scrolling and a full-fidelity 4K original asset for device background installation.
Why Generic APIs Fail at 4K Mobile Wallpapers
Building a wallpaper app with generic photography APIs causes 3 major developer headaches:
Stock photo APIs return 16:9 landscape or 4:3 desktop photos. On a vertical smartphone, your app must heavily crop the sides, ruining the subject and creating pixelated results.
Downloading raw 15 MB uncompressed images in a RecyclerView or StaggeredGrid freezes mobile UI threads and exhausts device RAM. You need pre-scaled thumbnails.
NexWall serves 9:16 portrait images natively. Grids download 20 KB WebP thumbnails; the full 4K asset is only fetched when the user sets or downloads the wallpaper.
4K Wallpaper API JSON Payload
Clean, strongly typed JSON designed for instant parsing in Dart, Kotlin, TypeScript, and Swift.
{
"id": 1420,
"category_id": 8,
"type": "image",
"resolution": "2160x3840",
"image_url": "https://nexwall.kodnextech.com/storage/wallpapers/neon-tokyo-cyberpunk-4k.webp",
"thumbnail_url": "https://nexwall.kodnextech.com/storage/thumbnails/neon-tokyo-cyberpunk-4k.webp",
"is_premium": false,
"downloads": 12840,
"likes": 3491
}4K Wallpaper API FAQs
Which API provides 4K resolution wallpapers for Android apps?
NexWall is a 4K wallpaper REST API tailored for Android and Flutter mobile apps. It features thousands of 2160x3840 portrait wallpapers with edge CDN delivery, low latency, and dual WebP thumbnail previews.
What image formats are used for 4K wallpapers?
NexWall serves optimized WebP and high-grade JPEG assets to ensure maximum visual sharpness on OLED displays while keeping download sizes reasonable for mobile networks.
Can I filter for only 4K wallpapers?
All wallpapers across NexWall categories are verified at high definition and 4K resolutions. The resolution attribute in the JSON payload informs your app of the exact pixel dimensions.
How many 4K wallpaper calls can I make for free?
Every developer receives 100 free requests per day. For high-volume production apps with tens of thousands of daily active users, Pro (₹399/mo or $4.99/mo, 10,000 requests/day) and Ultra plans are available.
Power Your App with 4K Wallpapers
Deliver stunning Ultra HD wallpapers to your users without the cost of image hosting or CDN bandwidth.