Microsoft Bing now lets you download the background image from the homepage, provided that you allow them access to your Facebook account. For those without Facebook accounts, here’s a workaround that lets you download the image without connecting to the Bing Facebook app.
Manually Download Bing Homepage Image
Navigate to Bing.com (these instructions use Chrome).
View the page source (CTRL+U in Chrome).
Search for the words “hpWall.download”.
Copy the first argument for hpWall.download to your clipboard. It’ll be a bunch of random letters and numbers.
Type the following into your address bar: http://www.bing.com/hpwp/
Don’t press enter just yet. Now, paste the argument from the hpWall.download function into the url. It’ll look like this:
Now you can press Enter and the image will download.