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_gcl_au · Google Ads 90 days
Conversion attribution for Google Ads campaigns.
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_ga · Google 2 years
Set by Google Tag (gtag.js) alongside Google Ads. Distinguishes unique users.
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_ga_<id> · Google 2 years
Per-property session counter. Created by gtag.js even in an Ads-only setup.
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IDE · Google DoubleClick 13 months
Set on doubleclick.net for ad measurement and remarketing.
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_fbp · _fbc · Meta (Facebook) 90 days
Meta Pixel, measures Facebook and Instagram ad conversions and enables remarketing.
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li_fat_id · bcookie · lidc · LinkedIn Up to 1 year
LinkedIn Insight Tag, measures LinkedIn ad conversions and enables campaign attribution and remarketing.
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Visitor pixel · __cflb · Lemlist Page visit · load-balancing cookie up to 7 hours
Visitor pixel that records the page visited, active time and click count for sales attribution. It loads only after marketing consent.
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ap3c · ap3sessionkey · ap3* · Ortto Up to 1 year
Connects website visits and activity to Ortto for sales and marketing automation.