Browser Method

Open up your browser. I suggest using Firefox.Load a Steam profile with a background that you're interested in and right click it.Select "".Now, open Google Images in a new tab and simply drag and drop the background into Google Images. In the results it will display the background's community market link.If you do not wish to use Google Images, look at the URL of the background image and copy the numbers after "". This is the app ID of the game the background came from. Copy this number.Paste the numbers you copied in a Steam store URL. This URL should look something like the image below.This will direct you to the game the background is from. After finding out the game's name, you can simply go to the community market and search for the background.