What is server-side GTM?
Server-side Google Tag Manager (sGTM) is a way of measuring where data is first sent to your own server and only forwarded from there to analytics and advertising platforms (GA4, Meta, Google Ads, etc.).
Compared to traditional client-side GTM, where all scripts load in the visitor's browser, the server-side approach brings fundamental advantages.
Why isn't client-side tracking enough?
- ✗Ad-blockers block ~30-40% of data (uBlock, AdGuard, Brave)
- ✗ITP (Safari) limits cookies to 7 days → you lose returning visitors
- ✗Tracking Protection (Firefox, Edge) blocks third-party cookies
- ✗Slow loading — dozens of scripts slow the site down
How does server-side tracking work?
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1
The web browser sends data
Client-side GTM sends the event to your subdomain (e.g. sgtm.yoursite.cz)
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2
Your server processes the data
The sGTM container on the server receives, validates, and transforms the data
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3
The server sends it to the platforms
Data is sent server-to-server to GA4, Meta, Google Ads, TikTok, Seznam, etc.
Benefits of server-side tracking
📈 More accurate data
Bypass ad-blockers and ITP → capture 20-40% more conversions
🔒 First-party cookies
Cookies set by the server last 2 years (vs. 7 days with ITP)
⚡ Faster site
Fewer scripts in the browser = faster page loads
🛡️ Better GDPR compliance
Full control over data, IP masking, EU servers
🎯 Better conversions
Meta Event Match Quality +20-30%, Google Ads Enhanced Conversions
🔧 Full control
Filtering, enrichment, and transformation of data on the server
Ready to start?
A server in the EU (Hetzner, Germany), automatic provisioning within 5 minutes, SSL, monitoring, and Czech support.
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