# niumoo/bing-wallpaper: A Java Service That Mirrors Bing's Daily 4K Images

> The repository collects Bing's daily image into a browsable archive and serves it through a Java application, with Markdown indexes that track each day's 4K URL. It suits people who want the images as files rather than as a desktop setting.

**niumoo/bing-wallpaper** — 必应每日超清壁纸（4K） Bing Daily Wallpaper (4K)

- Repository: https://github.com/niumoo/bing-wallpaper
- Website: https://bing.wdbyte.com
- Stars: 3,743 · Forks: 514
- Language: Java
- License: Apache-2.0
- Published: 2026-09-23 · Updated: 2026-09-23 · Language: en
- Canonical page: https://hysenlabs.com/projects/niumoo-bing-wallpaper

## What niumoo/bing-wallpaper actually solves

Bing publishes one photograph a day, and the image is reachable from a URL that carries the date's identifier. That URL is convenient for a single download and awkward for anything else. It changes daily, the identifier is opaque, and nothing on the page tells you what the image from three weeks ago was. The repository's answer is to keep the list. The README is a grid of thumbnails, each labelled with a date such as 2026-09-24 or 2026-09-23 and paired with a download 4k link pointing at a cn.bing.com URL with w=3840 and h=2160 parameters. The archive is the product. Someone who wants yesterday's photograph, or who wants to build a rotating background from a folder of files, gets a dated index instead of a live page that only shows today. The audience is narrow and identifiable: people who want the image as an asset, not as a browser setting. A user who just wants Bing's picture on their lock screen is better served by a desktop client, and the repository does not pretend to be one.

## The repository layout and the Java service behind the Markdown

Top-level entries are .github/, .gitignore, LICENSE.md, README.md, bing-wallpaper.md, docs/, picture/, pom.xml, src/ and zh-cn/. The presence of pom.xml and src/ means a Maven Java application, and the presence of bing-wallpaper.md alongside README.md suggests the index is generated rather than hand-typed. The README's grid is the clearest evidence of the data flow: an image identifier is turned into a thumbnail URL at w=384 and h=216, and into a full-resolution URL at w=3840 and h=2160, both with the same id parameter. The picture/ directory is where images live in the repository, and docs/ plus the zh-cn/ directory hold the documentation and the Chinese-language variant. The homepage, bing.wdbyte.com, is the hosted instance of the same service. What the README does not show is the scheduling layer: nothing there states how often the collector runs, whether it is a cron job, a Spring scheduler or an external trigger. The README also does not document rollback, retry behaviour or what happens when Bing changes its URL format. Those are the parts a self-hoster will have to read in src/ rather than in the README.

## Building niumoo/bing-wallpaper and pulling the current image

The README does not give install steps, so the entry point is the repository itself. The pom.xml marks it as a Maven project, which means the conventional build applies. Clone the repository, then build it from the project root with the Maven package goal. The README does not name the output artifact or the Java version required, so read pom.xml for the source and target levels before running the build, and check the modules under src/ for the entry point. Once the application is running, the hosted instance at bing.wdbyte.com shows what the service returns. For a single image without running anything, the README's own links are usable directly. The README gives this link for 2026-09-23:

```bash
https://cn.bing.com/th?id=OHR.FallAspens_EN-US7211031109_UHD.jpg&rf=LaDigue_UHD.jpg&pid=hp&w=3840&h=2160&rs=1&c=4
```

That is the 4K URL for that date, with the id copied from the README. What you should see when you open it is a 3840 by 2160 JPEG. The thumbnails in the README use the same id with w=384 and h=216, so a smaller preview needs no separate source. If you want the whole archive, the dated index in the README is the map, and picture/ is where the repository keeps its copies.

## Where the project stops being the right tool

This is a server-side archive, not a wallpaper application. It does not set your background, rotate images on a schedule, or integrate with a lock screen. A Windows user searching for how to use Bing wallpaper in Windows 11 will find nothing here that a desktop client does not already do better, because the repository produces files and an index, and the operating system is what turns a file into a background. The second limit is dependency on Bing's URL scheme. The README's links all follow the same cn.bing.com pattern with an OHR identifier, and if that identifier format changes, the index generation breaks until the code is updated. The README describes no fallback source. The third limit is the archive's own boundary: the README shows a run of dates from 2026-08-28 through 2026-09-24, and it does not state how far back the stored history goes, so anyone needing years of images should check picture/ and docs/ before assuming depth. Finally, the README does not document rollback, so a bad batch of URLs has no described recovery path.

## How it differs from the official Bing Wallpaper app

The official Bing Wallpaper application is a desktop client: you install it, and it changes your background, usually with a daily rotation and a tray icon. That is a different job from what niumoo/bing-wallpaper does. The repository keeps the images and exposes them, which means the output is a directory of dated files and a Markdown index, not a setting in your operating system. The practical difference shows up in what you can do next. With the desktop client, the image is consumed by the desktop and you have little control over where it goes. With this project, you can point a slideshow at the archive, keep a personal collection, or feed the URLs into another tool, because the 4K link is a plain URL with w=3840 and h=2160. The trade-off runs the other way too: the desktop client needs no server, no Java runtime and no Maven build, while this project needs all three. Choose by whether the image is the end product or the input to something else.

## Maintenance, licensing and the cost of keeping it running

The repository is not archived and the last push was on 2026-09-23, so the project is being touched. That is a statement about commit activity, not a promise about the hosted instance or about Bing's URLs. The upgrade cost is the ordinary one for a small Java service: a Maven build, a Java runtime, and whatever process keeps it running. Because the project's core dependency is an external URL format that Microsoft controls, the real maintenance risk is not the code but the source. A change to the cn.bing.com thumbnail parameters would require a code change, and the README does not describe how quickly that would be handled. The licence is Apache-2.0, which permits commercial and private use and requires that the licence and notices be preserved; it also includes a patent grant. That covers the project's own code. It does not cover the photographs, which are credited in the README to photographers and agencies such as djr-photography/Shutterstock, and the README does not state a separate licence for the images. Treat the code licence and the image rights as two separate questions.

## Conclusion

Adopt niumoo/bing-wallpaper if you want Bing's daily image as a dated file archive behind a Java service you host yourself, and if you are comfortable reading the repository layout to find the endpoints, because the README is an image index rather than a setup guide. Do not adopt it if you want a one-click desktop client that rotates your lock screen, since the repository ships a server and Markdown, not a Windows or macOS installer. Verify first that the 4K URLs still resolve for the dates you care about, that the archive depth matches how far back you need, and that you can run the Maven build with the Java version your machine has.

## FAQ

### How do I get the Bing wallpaper of the day from this project?

The README lists each date with a download 4k link, and that link can be opened directly in a browser. The URL carries w=3840 and h=2160 for the full-resolution image, and w=384 and h=216 for the thumbnail.

### How do I install niumoo/bing-wallpaper?

The README does not give install steps. The repository has a pom.xml and src/, so it is built as a Maven project, and the README does not state the required Java version or the output artifact.

### Is niumoo/bing-wallpaper free to use?

The code is licensed Apache-2.0, which permits private and commercial use with the licence and notices preserved. The README credits the photographs to photographers and agencies, and does not state a separate licence for the images themselves.

### How do I use niumoo/bing-wallpaper?

Use the dated index in the README to find the image for a given day, then follow its download 4k link. The repository also contains a Java service whose hosted instance is at bing.wdbyte.com.

## Sources

- [Issues](https://github.com/niumoo/bing-wallpaper/issues)
- [License: Apache-2.0](https://github.com/niumoo/bing-wallpaper/blob/main/LICENSE)
- [niumoo/bing-wallpaper on GitHub](https://github.com/niumoo/bing-wallpaper)
- [Project website](https://bing.wdbyte.com)
- [README](https://github.com/niumoo/bing-wallpaper/blob/main/README.md)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/niumoo-bing-wallpaper