How can I find files on Wikipedia (or the Wikimedia Commons) that are in two or more specific categories? For instance, if I was searching for files to put into the category "dogs and cats", I would want to find all of the files that were in both the category "dogs" and the category "cats." How can this be accomplished?

1 Answer 1


You can use CatScan to do that.

For example, to query files on Commons, you can start with http://toolserver.org/~magnus/catscan_rewrite.php?language=commons&project=wikimedia&ns[6]=1 and enter the categories you want into the Categories box.

  • For CatScan, how can you enter multiple categories and negative categories? Should they be separated by commas? Jul 5, 2012 at 3:48
  • 1
    Just put them on separate lines.
    – svick
    Jul 5, 2012 at 7:49

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