Best Free Wallpaper APIs in 2026: NexWall vs Unsplash vs Pexels vs Pixabay vs Wallhaven

Disclosure up front: I build NexWall, one of the five APIs in this comparison. I've tried to be fair: the other four are well-established services, and for several use cases one of them is the better choice. I say where that applies.

Starter code: free, MIT-licensed examples for Flutter, Android Kotlin, React Native, Python and Next.js / Laravel / JavaScript.

If you're building a wallpaper app, a launcher theme, a "new tab" page, or a script that changes your desktop background every morning, you need images. Scraping is legally risky and fragile. Bundling a few hundred images into your APK gets stale quickly. A free wallpaper API solves both problems.

"Wallpaper API" covers two quite different kinds of service, though:

1. General stock-photo APIs (Unsplash, Pexels, Pixabay). These are huge libraries of photography. They aren't wallpaper-specific, but you can filter by orientation and search keywords.
2. Wallpaper-specific APIs (NexWall, Wallhaven). These have catalogs organized around wallpaper use: aspect ratios, resolutions, and wallpaper-style categories.

Here's how the five compare.

Quick comparison

	NexWall	Unsplash API	Pexels API	Pixabay API	Wallhaven API
Focus	Curated phone wallpapers (portrait 9:16)	General high-quality photography	General photos + videos	Photos, illustrations, vectors, videos	Community-uploaded desktop & phone wallpapers
Free tier	Yes: 100 req/day, 60 req/min	Yes (demo mode, then apply for production)	Yes	Yes (free key)	Yes (key optional for SFW content)
Auth	Bearer API key	Access key (OAuth for user actions)	API key header	API key query param	Optional API key
Attribution / usage rules	Governed by the NexWall Developer API License	Attribution + hotlinking + download-tracking guidelines	Attribution to Pexels and photographers requested	Display Pixabay attribution with results; caching and hotlinking rules	Varies per image; uploaders don't always hold rights
Max resolution	Up to 2160x3840 (4K portrait)	Original photo sizes (often very large)	Original sizes	Large sizes on request (some need approval)	Original upload sizes (often 4K+)
Categories	50+ curated wallpaper categories	Topics / collections	Collections	Category param	Categories (general/anime/people) + tags
Live / video wallpapers	Yes, looping MP4 (Ultra plan)	No	Yes (stock videos, not wallpaper loops)	Yes (stock videos)	No
Catalog size	Smaller, curated	Very large	Very large	Very large	Very large
Paid tiers	Pro $4.99/mo, Ultra $10.99/mo	API is free to use (check docs)	API is free to use (check docs)	API is free to use (check docs)	API is free to use (check docs)

Exact rate limits for the other services change over time, so check their current docs before relying on a number. I've avoided quoting limits I couldn't verify for this article.

Unsplash API

Best for: beautiful, high-end photography, and apps where photographer attribution fits the UX.

Unsplash has arguably the most aesthetically consistent large photo library on the web, and the API is mature and well documented. Search supports an orientation filter (portrait), so you can get phone-friendly results.

Things to know:

• New apps start in a rate-limited demo mode. You apply for production access, and the app is reviewed against their guidelines.
• The API guidelines require you to hotlink images from Unsplash's URLs (no re-hosting), attribute the photographer and Unsplash, and trigger the download endpoint when a user downloads or sets a photo.
• It's a photography library. You won't find AMOLED blacks, abstract gradients, or "anime wallpaper" style content.

Verdict: Excellent if your app is photography-centric and you're happy to build attribution into the UI.

Pexels API

Best for: free photos and videos with a simple key and generous use.

Pexels offers a straightforward REST API with search, curated photos, and a video API. It supports orientation filters, and its src object returns multiple sizes (including portrait), which is convenient for phone layouts.

Things to know:

• Pexels asks you to show a prominent link back to Pexels and to credit photographers where possible.
• Default rate limits are hourly and monthly. Higher limits are available on request. Check their docs for the current numbers.
• Like Unsplash, it's a general stock library rather than a wallpaper catalog.

Verdict: A great default for "I need nice images and maybe some video" with minimal friction.

Pixabay API

Best for: illustrations, vector art, and mixed media alongside photos.

Pixabay's API is free with a key, and it covers photos, illustrations, vectors, and videos. Filters include image_type, orientation, category, min_width/min_height, and safesearch.

Things to know:

• It's rate limited per time window. Pixabay also asks you to cache API responses and not to permanently hotlink their images. Check their docs for the current specifics.
• When you show search results from the API, you're expected to show where they came from (Pixabay).
• Full-resolution originals may require approved access.

Verdict: Useful when you want illustrations or vectors and not just photography. Read the caching and hotlinking rules carefully before designing your architecture.

Wallhaven API

Best for: desktop wallpaper enthusiasts and huge, tag-rich community content.

Wallhaven is the closest thing to a "real" wallpaper community with a public API. Its search lets you filter by ratio (e.g. 9x16 for phones), minimum resolution (atleast), categories (general/anime/people), and purity (SFW/sketchy/NSFW). You need an API key only for NSFW content and account-specific settings.

Things to know:

• Content is user-uploaded. Many wallpapers are fan art, game screenshots, or edits, and the uploader doesn't necessarily own the rights. For a personal desktop script that's usually fine. For a commercial app on the Play Store, it's a real licensing risk you need to evaluate yourself.
• Make sure your requests filter purity to SFW if your app is for a general audience.
• Rate limits are per minute. Check the docs.

Verdict: Fantastic catalog for personal projects and desktop tools. Think carefully before you build a monetized product on it.

NexWall

Best for: phone wallpaper apps that want curated, wallpaper-specific content and a clear commercial path.

Full disclosure again: this is the one I build. NexWall is a wallpaper REST API designed specifically for wallpaper apps rather than general imagery:

• Portrait-first: 9:16 wallpapers up to 2160x3840 (4K UHD portrait), with thumbnails included in every record.
• 50+ curated categories (for example "AMOLED & Pure Black"). You can list them with GET /categories and filter with category_id.
• Wallpaper-oriented feed options: sort=newest|oldest|popular|random, tag search, and pagination up to 100 per page.
• Live wallpapers: looping MP4s via type=live on the Ultra plan.
• Free tier: 100 requests/day, 60 requests/min, no credit card, non-premium categories.
• Paid tiers: Pro ($4.99/mo or ₹399/mo) gives 10,000 req/day, all categories, and commercial monetization rights. Ultra ($10.99/mo or ₹899/mo) gives 50,000 req/day plus live MP4 wallpapers.
• An OpenAPI 3.0 spec at https://nexwall.kodnextech.com/openapi.json, so you can import it into Postman or generate a client.

curl "https://nexwall.kodnextech.com/api/developer/v1/wallpapers?sort=popular&per_page=20" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json"

Where NexWall is weaker (honestly):

• It's newer and smaller. The catalog is curated, not crowd-sourced, so it's much smaller than Unsplash, Pexels, Pixabay, or Wallhaven. If you need millions of images or very niche search terms, the big libraries win.
• The free tier is modest. 100 requests/day is enough to build and test, and with server-side caching a small app can stretch it. A popular app will need a paid plan or a caching proxy.
• Portrait-first. Desktop/landscape wallpaper users are better served by Wallhaven's ratio filters, or you'll need to letterbox and blur the images yourself.
• Premium categories and live wallpapers are paid, unlike the fully free stock APIs.
• Monetized apps need a paid plan. Commercial deployment rights in Play Store / App Store apps (with AdMob or subscriptions) are part of Pro and Ultra, under the Developer API License.

Verdict: A good fit if you're building a phone wallpaper app and want wallpaper-native categories, consistent 4K portrait output, live wallpapers, and a clear commercial license, without building attribution UI around a stock-photo library.

Which one should you pick?

Your situation	Good choice
Photography-centric app, happy to show attribution	Unsplash
Need free photos and videos with minimal setup	Pexels
Need illustrations or vectors	Pixabay
Personal desktop wallpaper script, huge variety	Wallhaven (filter to SFW)
Phone wallpaper app with categories, 4K portrait, live wallpapers, commercial plan	NexWall
Not sure yet	Prototype with two of them behind a common interface and compare real results

That last row is worth taking seriously. Put your image source behind an interface such as WallpaperRepository.fetch(category, page) and you can switch providers, or combine them, without rewriting your UI.

Universal tips, whichever API you use

1. Never ship your API key in a client binary. Use a small backend proxy. It also lets you cache responses across users, which effectively multiplies any free tier.
2. Use thumbnails in grids. Load full-resolution files only on the detail screen or when setting the wallpaper.
3. Respect each provider's rules. That means attribution, hotlinking, caching, and download tracking. Breaking them is the quickest way to lose your key.
4. Handle 429 properly. Read Retry-After and back off. Don't hammer the API.
5. Check licensing for commercial apps. "Free to download" isn't the same as "licensed for use in my monetized app".

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I work on NexWall. If you think I've misrepresented any of the other APIs, please say so in the comments and I'll correct it. I'd rather this comparison be accurate than flattering.

Links: NexWall docs · Free API key · Unsplash Developers · Pexels API · Pixabay API docs · Wallhaven API