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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 results are found, we'll try to show related results.
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 Pages about dogs from
cats Pages about cats, excluding
intitle:dogs Page title includes the word "dogs"
inurl:cats Page url includes the word "cats"

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Prior versions on GitHub.