GCS parameter meaning (Consent Mode) + examples

If you see gcs=G100 or gcs=G111 in a request, that’s a consent signal used in Consent Mode flows. The exact meaning matters for Google Ads attribution and modeling.

Common examples

G100: often associated with a fully-consented state.
G111: often associated with a denied/restricted state (modeling/limited attribution).
G110: mixed/partial states can show up in misconfigurations (GA4 looks “fine”, Ads degraded).

Decode your value instantly

Paste your value (G100/G111/…) and get a readable meaning plus what it implies.

Open GCS Decoder →

How gcs affects Google Ads

If GA4 shows conversions but Google Ads doesn’t, consent signals are a frequent culprit. Use the debug guide:
GA4 conversions not showing in Google Ads →