Google Analytics Checker
Try
Check whether a website has Google Analytics 4 installed, which measurement ID it sends to, and whether it loads through Google Tag Manager. Old Universal Analytics tags show up too.
Everything the page code says about Google Analytics
The checker reads the page HTML and opens every Google Tag Manager container it loads, so a GA4 tag set up inside GTM still counts.
GA4 measurement IDs
Every G- measurement ID on the page or inside its GTM containers, so you can match it to the right property.
Tag Manager containers
Which GTM containers load, including ones served through a custom loader.
Leftover Universal Analytics
Old UA- tags that no longer collect anything and can be removed.
Consent Mode
Whether Google Consent Mode v2 defaults are set, and which consent banner the site uses.
Server-side tagging
Whether hits go straight to Google or through a server container on your own domain.
Duplicate tags
The same ID loaded twice, which can count page views twice.
How it works
From a URL to a clear answer
01
Fetch the page
We load the page the way a first-time visitor's browser receives it.
02
Open the containers
Every Google Tag Manager container the page loads is opened, so tags set up inside GTM are found too.
03
List what's there
You get each analytics and tag ID with the code it came from, plus anything that looks duplicated or out of date.
04
Confirm in GA4
Open your GA4 property's Realtime report, visit the site in another tab and check your visit appears.