Web Applications Stack Exchange is a question and answer site for power users of web applications. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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?

share|improve this question

migrated from superuser.com Jul 4 '12 at 22:20

This question came from our site for computer enthusiasts and power users.

up vote 3 down vote accepted

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.

share|improve this answer
For CatScan, how can you enter multiple categories and negative categories? Should they be separated by commas? – Anderson Green Jul 5 '12 at 3:48
Just put them on separate lines. – svick Jul 5 '12 at 7:49

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.