Google Websearch / Search URL Parameters Explained

If you are really interested in knowing the different parameters appended at the end of the Google search URL, then go through the list given below. The list is originally created by Joost de Valk containing the different parameters you can add to the Google search URL.

Parameter	Description (Value)
Search modifiers
q / as_q	the search query
as_epq	matches exact phrase, same as searchphrase surrounded by quotes in searchbox
as_oq	with at least one of the search terms, same as searchterms combined with OR in searchbox
as_eq	without these searchterms, same as searchterm prefixed with - in the searchbox
qdr / as_qdr	Date restriction, show results up to either 3 months old, 6 months old, or 1 year old (3m 6m y)
as_occt	query term occurs in (any title body url links)
as_filetype	specify filetype (pdf ps dwf kml kmz xls ppt doc rtf swf)
as_ft	exclude or include solely files with filetype given in as_filetype (e i)
sitesearch	the same as site: (URL with or without http://)
as_sitesearch	same as sitesearch, but shows site:URL in the search box, can be used together with as_dt (URL with or without http://)
as_dt	together with as_sitesearch shows you results from URL, or from all except that URL (i (only this URL) e (except this URL))
as_rq	find sites related to URL, same as related: in the search box (URL)
as_lq	find sites linking to URL, same as link: in the search box (URL)
hl	specifies the interface language
lr	language restrict ()
ie	input encoding
oe	output encoding ()
safe	safe search filtering (active (default) off)
filter	0
Result modifiers
num	number of results (<0..100>)
newwindow	open results in new window (1)
pws	disable personalized web search (0)
adtest	allows testing of ads without registering an impression, url's are not clickable (on)
Buttons
btnG	normal search from webinterface
btnI	I'm feeling lucky search (I%27m+Feeling+Lucky)
Localization (taken from: bluetent.typepad.com)
gl	country, for instance "US" ()
gll	latitude&longitude, (,)
gr	region, for instance GB-ENG ()
gcs	city, to use this gr must be set to the same value ()
gpc	postal code, only works if gl is set to "US" ()
gm	US designated metropolitan areas ()