DuckDuckGo supports search syntax you can use to fine-tune your queries.

Search Operators

Example	Result
cats dogs	Results about cats or dogs
"cats and dogs"	Results for exact term "cats and dogs". If no or few results are found, we'll try to show related results.
~"cats and dogs"	Experimental syntax: more results that are semantically similar to "cats and dogs", like "cats & dogs" and "dogs and cats" in addition to "cats and dogs".
cats -dogs	Fewer dogs in results
cats +dogs	More dogs in results
cats filetype:pdf	PDFs about cats. Supported file types: pdf, doc(x), xls(x), ppt(x), html
dogs site:example.com	Pages about dogs from example.com
cats -site:example.com	Pages about cats, excluding example.com
intitle:dogs	Page title includes the word "dogs"
inurl:cats	Page URL includes the word "cats"

If advanced syntax was used in a query and no results are found, we’ll try to show related results.

Please note: we are aware some of our advanced syntax isn’t operating 100% correctly on all queries and are actively working on it. It is unfortunately a non-trivial issue given we get our private results from a variety of sources.

Search Directly on Other Sites

• Use \ to go to directly to the first search result. For example, \futurama.
• Use ! to search other sites' search engines directly. Remember, though, because your search is actually taking place on that other site, you are subject to that site’s policies, including its data collection practices. For example, !a blink182 searches Amazon.com for blink182. There are thousands of sites covered!

Safe Search

• Add !safeon or !safeoff to the end of your search to turn on and off safe search for that search.

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Prior versions on GitHub.