URL Params

You can change DuckDuckGo settings via URL parameters by adding them after the search query, for example:     http://duckduckgo.com/?q=search&kp=-1&kl=us-en

Result Settings
Safe Search:	kp = 1 for On; -1 for Off.
Region:	kl = xa-ar for Arabia xa-en for Arabia (en) ar-es for Argentina au-en for Australia at-de for Austria be-fr for Belgium (fr) be-nl for Belgium (nl) br-pt for Brazil bg-bg for Bulgaria ca-en for Canada ca-fr for Canada (fr) ct-ca for Catalan cl-es for Chile cn-zh for China co-es for Colombia hr-hr for Croatia cz-cs for Czech Republic dk-da for Denmark ee-et for Estonia fi-fi for Finland fr-fr for France de-de for Germany gr-el for Greece hk-tzh for Hong Kong hu-hu for Hungary in-en for India id-id for Indonesia id-en for Indonesia (en) ie-en for Ireland il-he for Israel it-it for Italy jp-jp for Japan kr-kr for Korea lv-lv for Latvia lt-lt for Lithuania xl-es for Latin America my-ms for Malaysia my-en for Malaysia (en) mx-es for Mexico nl-nl for Netherlands nz-en for New Zealand no-no for Norway pe-es for Peru ph-en for Philippines ph-tl for Philippines (tl) pl-pl for Poland pt-pt for Portugal ro-ro for Romania ru-ru for Russia sg-en for Singapore sk-sk for Slovak Republic sl-sl for Slovenia za-en for South Africa es-es for Spain se-sv for Sweden ch-de for Switzerland (de) ch-fr for Switzerland (fr) ch-it for Switzerland (it) tw-tzh for Taiwan th-th for Thailand tr-tr for Turkey ua-uk for Ukraine uk-en for United Kingdom us-en for United States ue-es for United States (es) ve-es for Venezuela vn-vi for Vietnam wt-wt for World Traveler (none)
Meanings (disambig):	ki = 1 for On; -1 for Off.
0-click box:	kz = 1 for On; -1 for Off.
Auto-load:	kc = 1 for On; -1 for Off.
New Window:	kn = 1 for On; -1 for Off.
Favicons:	kf = b for Favicons + WOT warnings 1 for Just favicons w for Just WOT (trust) ratings fw for All WOT + favicons (both) -1 for Off
Embeds:	kb = d for videos when asked, thumbnails otherwise e for everything t for just thumbnails v for just videos n for none
Privacy Settings
Redirect:	kd = 1 for On; -1 for Off.
Address bar:	kg = g for GET; p for POST.
HTTPS:	kh = 1 for on; -1 for off.
Color Settings
Header:	kj = r3 for Muted red (default) d for Light green g for Intense green g2 for Green b for Light blue b2 for Blue r for Intense red r2 for Red p for Purple o for Orange w for White or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Highlight:	ky = e for Grey (default) -1 for Off g for Green b for Blue t for Tan y for Yellow p for Pink
URLs:	kx = r for Red (default) g for Green l for Black b for Blue p for Purple o for Orange e for Grey or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Background:	k7 = ow for Off-white (default) w for White or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Text:	k8 = g for Grey (default) or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Links:	k9 = b for Blue (default) or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Visited links:	kaa = p for Purple (default) or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Border:	kab = e for Grey (default) r for Red or write out the color code you want, e.g. %23395323 (%23 is an encoded # char).
Look & Feel Settings
Size:	ks = n for Large (default) l for Larger t for Largest m for Medium s for Small
Width:	kw = n for Normal; w for Wide; s for Super wide.
Placement:	km = m for Middle; l for Left.
Link font:	ka= a for Arial c for Century Gothic g for Georgia h for Helvetica n for Sans-serif e for Segoe UI s for Serif o for Tahoma t for Times b for Trebuchet MS v for Verdana or write out the font you want
Underline:	ku = 1 for On; -1 for Off.
Text font:	kt = a for Arial c for Century Gothic g for Georgia h for Helvetica n for Sans-serif e for Segoe UI s for Serif o for Tahoma i for Times t for Trebuchet MS v for Verdana or write out the font you want
Text link	k2 = -1 for Off (default) 1 for On
Interface Settings
Header:	ko = 1 for On & floating s for On & scrolling -1 for Off
Twitter:	k3 = 0 for Off Username for a particular username, e.g. lifehacker
Shortcuts:	kk = 1 for On -1 for Off l Just hide legend s Show full legend
Feedback:	ke = 1 for On; -1 for Off.
Top links:	kr = 1 for On -1 for Off c for Off & centered b Just hide Add to Browser
Dropdown:	kq = 1 for On n for On but don't save -1 for Off
Advertisements:	k1 = 1 for On n for On but don't save -1 for Off
Page #s:	kv = 1 for On n for On but no numbers -1 for Off
Sidebar:	k4 = 1 for On -1 for Off