Top Cookies

At webXray, we regularly scan large sections of the web to find the most prominently used cookies (see the knowledge base). We then trace these cookies to their source, attributing them to the companies that own them, reviewing their technical documentation, as well as conducting careful evaluation of policies which describe them.

Litigation and compliance tasks rely on primary source documentation, and all of our data is linked to official descriptions, privacy polices, and more. This form of investigation can be incredibly time consuming, but we've done that work for you.

We built our own cookie database because cookie lists provided by other vendors often crumble on closer inspection: they tend to contain significant errors, provide no authoritative source or attribution, and lack human review.

Name	Used For	Data Recipient	% of Sites
_ga →	Audience Measurement	Google Analytics →	81%
_ga_XXX →	Audience Measurement	Google Analytics →	79%
IDE →	Advertising And Marketing	Google Marketing Platform →	59%
_gid →	Audience Measurement	Google Analytics →	52%
locked_f5209 →	Advertising And Marketing	Locked →	45%
locked_3aa6a →	Advertising And Marketing	Locked →	43%
locked_38a52 →	Advertising And Marketing	Locked →	43%
locked_75f16 →	Advertising And Marketing	Locked →	41%
locked_86ba0 →	Design Optimization Advertising And Marketing	Locked →	41%
locked_1c773 →	Advertising And Marketing	Locked →	40%
locked_9e2a4 →	Advertising And Marketing	Locked →	40%
locked_5c90f →	Security	Locked →	39%
locked_d9ce8 →	Audience Measurement Advertising And Marketing	Locked →	39%
_gcl_au →	Audience Measurement Advertising And Marketing	Google →	37%
locked_37782 →	Audience Measurement Advertising And Marketing	Locked →	37%
locked_987d9 →	Advertising And Marketing	Locked →	36%
_gat_XXX →	Audience Measurement	Google Analytics →	35%
locked_091e0 →	Advertising And Marketing	Locked →	35%
locked_35f23 →	Advertising And Marketing	Locked →	35%
locked_97ae2 →	Advertising And Marketing Audience Measurement Security	Locked →	34%
locked_b366e →	Advertising And Marketing	Locked →	33%
__gads →	Advertising And Marketing	Google →	29%
__gpi →	Advertising And Marketing	Google →	29%
locked_d9d4e →	Advertising And Marketing	Locked →	26%
locked_21157 →	Advertising And Marketing	Locked →	24%
locked_f619c →	Advertising And Marketing	Locked →	23%
APC →	Advertising And Marketing	Google Marketing Platform →	23%
test_cookie →	Advertising And Marketing	Google Marketing Platform →	22%
locked_d3a43 →	Advertising And Marketing	Locked →	21%
locked_86686 →	Advertising And Marketing	Locked →	21%
locked_cf72c →	Advertising And Marketing	Locked →	19%
DSID →	Advertising And Marketing	Google Marketing Platform →	16%
locked_6fbdc →	Advertising And Marketing	Locked →	15%
YSC →	Security	YouTube →	15%
VISITOR_INFO1_LIVE →	Advertising And Marketing	YouTube →	15%
VISITOR_PRIVACY_METADATA →		YouTube →	15%
locked_bdc0c →	Security	Locked →	14%
locked_42f21 →	Audience Measurement	Locked →	14%
NID →	Audience Measurement Advertising And Marketing Security Functionality	Google →	14%
locked_5d1bb →	Advertising And Marketing	Locked →	12%
locked_b3a99 →	Security	Locked →	11%
locked_31230 →	Design Optimization Advertising And Marketing	Locked →	9%
locked_0e14f →	Design Optimization Advertising And Marketing	Locked →	9%
locked_23fe3 →	Design Optimization	Locked →	9%
locked_f45d2 →	Design Optimization	Locked →	9%
locked_4040c →	Design Optimization	Locked →	9%
locked_ccc4a →	Advertising And Marketing	Locked →	9%
locked_d0b93 →	Advertising And Marketing	Locked →	8%
locked_ed194 →	Audience Measurement Advertising And Marketing	Locked →	8%
locked_cd90b →	Audience Measurement Advertising And Marketing	Locked →	8%
_dc_gtm_XXX →	Audience Measurement	Google Analytics →	7%
locked_1d425 →	Audience Measurement	Locked →	7%
locked_5e5be →	Audience Measurement	Locked →	7%
locked_a4812 →	Audience Measurement	Locked →	6%
locked_59476 →	Functionality	Locked →	5%
locked_26cfa →	Advertising And Marketing	Locked →	4%
locked_e32cc →	Advertising And Marketing	Locked →	4%
locked_397a3 →	Audience Measurement	Locked →	3%
locked_64331 →	Audience Measurement	Locked →	3%
AMP_TOKEN →	Audience Measurement	Google Analytics →	3%
FPID →	Audience Measurement	Google Analytics →	3%
FPLC →	Audience Measurement	Google Analytics →	3%
locked_931d2 →	Audience Measurement Advertising And Marketing	Locked →	3%
__utmz →	Audience Measurement	Google Analytics →	3%
__utmb →	Audience Measurement	Google Analytics →	3%
__utma →	Audience Measurement	Google Analytics →	3%
__utmc →	Audience Measurement	Google Analytics →	3%
__utmt →	Audience Measurement	Google Analytics →	2%
locked_6b76b →	Functionality	Locked →	2%
locked_fae65 →	Audience Measurement Functionality	Locked →	2%
locked_75d0f →	Audience Measurement Functionality	Locked →	2%
locked_00ca0 →	Audience Measurement Functionality	Locked →	2%
locked_fa837 →	Audience Measurement Functionality	Locked →	2%
locked_490be →	Audience Measurement Functionality	Locked →	2%
locked_a0751 →	Functionality	Locked →	2%
locked_bddfd →	Functionality	Locked →	2%
locked_77400 →	Functionality	Locked →	2%
locked_d64fc →	Advertising And Marketing	Locked →	2%
locked_02540 →	Compliance Advertising And Marketing	Locked →	2%
FPAU →	Audience Measurement Advertising And Marketing	Google →	1%
locked_3f571 →	Functionality	Locked →	1%
locked_d1c94 →	Advertising And Marketing	Locked →	1%
locked_eb084 →	Audience Measurement	Locked →	1%
locked_48a51 →	Audience Measurement	Locked →	1%
locked_2f83e →	Audience Measurement Functionality	Locked →	1%
locked_64e43 →	Functionality	Locked →	1%
locked_92815 →	Advertising And Marketing	Locked →	1%
locked_5ba11 →	Call Tracking Advertising And Marketing	Locked →	1%
locked_9b2ef →	Audience Measurement	Locked →	1%
locked_8a197 →	Functionality	Locked →	1%
locked_b2f87 →	Functionality	Locked →	1%
locked_c1367 →	Audience Measurement	Locked →	1%
locked_ce27e →	Advertising And Marketing	Locked →	0%
locked_60b8d →	Advertising And Marketing	Locked →	0%
locked_4fbdc →	Audience Measurement Functionality	Locked →	0%
locked_19f2a →	Audience Measurement Functionality	Locked →	0%
locked_19087 →	Audience Measurement Functionality	Locked →	0%
locked_e3888 →	Advertising And Marketing	Locked →	0%
__gsas →	Advertising And Marketing	Google →	0%
locked_d7e85 →	Functionality	Locked →	0%
SID →	Security	Google →	0%