What are the benefits of server-side tagging?

The benefits of server-side tagging are many. You regain control of your data and what is shared with third-party marketing platforms. You improve both campaign optimization and the accuracy of your marketing reporting and data collection. And in the age of Google Analytics and SEO, you also improve your site's performance due to fewer scripts running on your website.

But before we dig into what server-side tagging is, we need to take a step back to understand how this new technology came about and what problems it's looking to solve.

Let's refresh our memories by starting with what tags actually are. 

A quick recap

What is tagging?

A tag is a small piece of code that collects data about website visitors. It's like a tiny tracker that records information such as:

• Pages visited: Which pages a user viewed on your website.
• Clicks: What links or buttons a user clicked.
• Purchases: What products a user bought.
• Form submissions: Information filled out in forms.

This data is then used for various purposes, including:

• Analytics: Understanding website traffic and user behavior.
• Marketing: Targeting ads to specific audiences.
• Conversion tracking: Measuring the effectiveness of marketing campaigns.

What is server-side tagging?

Server-side tagging simply means that these tags are placed and executed on the website's server, rather than directly on the visitor's device.

Client-side tagging and server-side tagging comparison.

How client-side tagging works

Most marketers know that when they kick off a campaign, they get prompted by their chosen marketing platform to integrate a pixel or code snippet. We then use that code snippet on our websites to gauge how many conversions resulted from the traffic generated by each marketing platform or channel. 

So, when we implement that code snippet (or “tag”) on our website, we know that we establish a direct communication channel between our user's web browser and the third-party vendor's platform we use to run our marketing.

In essence, these tags have two functions:

1. They drop cookies into our user's web browser, allowing us to see a user that came on day two or three and maybe converted on day four. 
2. They alert us to interactions that take place on our webpage. For example, a user loaded a page, scrolled, clicked a video, and later converted. These interactions are sent as HTTP requests to those different vendors. 

In other words, when a site page loads, the container is loaded simultaneously, tracking codes are triggered, and all interaction data is sent as HTTP requests to Google Analytics, Google Ads, and other third-party analytics. 

The illustration below illustrates how client-side tracking works with direct links to various data streams.

How tracking looks client-side.

There are many issues with this setup, but the main one is the privacy concerns of consumers.

When privacy is the problem, third-party cookies need to go

Many browsers, if not all at this stage, have imposed some form of cookie restrictions.

Usually, those are third-party cookies, which are blocked in browsers like Safari and Firefox. You basically need to go into your settings and opt in if you want them to track YOU across the entire internet. Who does that?!

Also, we marketers don't know for certain what they're collecting with these scripts. It's hard to filter out what we want them to collect. Once you've implemented that tag, it can scrape everything on your website, even when a consumer fills out a form – oh, gosh!

Server-side tagging is here, hurray!

Server-side tagging is an emerging technology. Instead of being a client-side model between a web server and an app (as shown above), you just set up one data stream to the cloud while cutting direct links to different external vendors.

You sever that communication channel between your user's browser and various marketing platforms. And instead, you send that data stream to a server in the cloud or on-premise to keep track of all your conversion data.

The illustration below shows a server-side container with various data streams going in and out.

A server-side tagging setup.

Once you've got that data, it's like a staging area where you can decide what you want to pass on to your marketing platforms. Pretty neat, right?

Server-side tracking offers many advantages over client-side tagging, such as improved site performance and security. Fewer measurement tags in your website or app mean less code to run on your website. User data is better protected and more secure when collected and distributed in a customer-managed, server-side environment. Other tags send data to a cloud instance, which is processed and routed.

Yet, the biggest benefit is that you gain more control of your data. You might not want to pass on certain information, like IP addresses, cookie IDs, or other identifiers. Or maybe you do. Regardless, you should get consent! But even if you have permission, some browsers will limit the expiry time of first-party cookies - flushing them out after as little as 24 hours. This affects the efficacy of your tags, campaign optimization, and remarketing pool. However, you can avoid these limitations with server-side tagging, which can potentially have a major business impact.

Common use cases for server-side tagging

So where do we see server-side tagging coming most commonly into use? These are the top areas that benefit from and favor server-side tagging, and the reasons why.

1. High‑traffic websites or mobile workflows
Reducing client‑side script load improves both UX and SEO metrics.

2. Privacy‑sensitive industries
Fields like finance or health that must limit data exposure benefit from controlled, server‑side data flows.

3. Reliance on conversion APIs
Platforms like Facebook, TikTok, and Pinterest increasingly favor server‑to‑server event ingestion for accurate attribution.

4. Cross‑device or cookieless tracking environments
Browser identifiers may be unavailable; server logic enables more robust stitching of user paths and events. We'll talk some more about cookieless tracking later in the post, so keep reading!

The benefits and drawbacks of server-side tagging

The many benefits of server-side tagging include?

• Improved site performance
  By shifting tag execution from the user’s browser to the server, server‑side tagging dramatically reduces client‑side script load and network calls — meaning faster page load times and smoother user experience.
• Stronger privacy and data control
  You gain full control over what data is collected, can filter out sensitive identifiers (like IPs or user agent strings), and support a first‑party cookie context, and that makes compliance with privacy frameworks like GDPR and CCPA much easier.
• Higher data quality and accuracy
  Server‑side tracking is more resilient to ad blockers, browser privacy features, or network disruptions. The result? More reliable analytics and conversion data
• Enhanced security
  Sensitive data can be anonymized or enriched server‑side without exposing it in the browser, improving overall security posture

It almost sounds too good to be true. Well, there are some drawbacks. Let's have a look at those.

• Technical complexity and resource costs
  Server-side tagging requires implementation requires backend setup (e.g., server container, hosting, DNS, logic), which is more complex and expensive than client‑side tagging.
• Operational overhead: Maintaining, debugging, and scaling the server‑side infrastructure demands ongoing technical and financial resources. 
• Potential for data duplication: Particularly when using both client‑ and server‑side tags (e.g., pixel + conversion API), deduplication logic is essential to avoid inflated or errant event counts .

Unlike client-side tagging, server-side tagging is not as easy to implement, and you'll incur some costs depending on the number of requests sent. However, those costs are worth it, because of all the other benefits you receive from setting up the server-side container.

Check out Google’s documentation on server-side tagging, showing you how to move measurement tag instrumentation from your website or app to a server-side processing container on the Google Cloud Platform (GCP) or other.

What are the ramifications of third-party cookies phasing out?

Some marketing capabilities will be gone, unfortunately. Retargeting strategies that third-party data enables will disappear. This includes aggregated lists about an interest you might want to target, like people who love pets or sports.

One thing you can do instead, which the digital marketing industry is pushing for, is to leverage your own first-party data. You could collect first-party data from your website and app platforms, then send that data together with media data to Funnel or a data warehouse. When it comes to data collection, the interesting thing is what kind of back-end, offline, and other first-party data you’re already sitting on that you can use in your marketing efforts.

Want to know more about setting up your first-party data strategy? Read our how-to guide here.

Perhaps there are better targeting capabilities, segments, and audiences you want to bid on differently. You could dig into the audience with your first-party data. 

Sure, retargeting based on third-party cookies will phase out. But you can still retarget people who have visited your website. This can be particularly useful if you can prolong the expiry time for your first-party cookies, which server-side tagging enables.

Server-side tagging for marketers

For marketers, the value of server-side tagging goes beyond a technical upgrade — it’s more about future-proofing measurement in a world where browser restrictions and cookie deprecation are reshaping how data is collected. Traditional client-side tagging (Google Tag Manager Web) relies on code running directly in the browser, and as we mentioned, is increasingly limited by privacy regulations, ad blockers, and tracking prevention.

Server-side tagging shifts this process to a secure server environment, such as Google Cloud Platform or another hosting solution. Instead of measurement tags firing on the user’s device, they run in a controlled server container. The result for marketers is a more reliable data, faster site performance, and greater flexibility in how they manage and share information with advertising and analytics platforms.

In short: client-side tagging is the old game; server-side tagging is the new one. It helps marketers maintain accurate measurement, adapt to privacy-first changes, and keep retargeting and attribution strategies effective in the years ahead.

Reasons marketers love server-side tagging:

• Cleaner campaign attribution: By supporting conversion API workflows, even in environments where client tracking fails (such as ad blockers), you improve ad platform performance and measurement precision.

• Better first‑party targeting: Storing and managing data on your domain lets you maintain longer cookie lifetimes for remarketing and personalization — even when browsers shorten default expiries.

• Greater control and privacy‑safe optimization: You determine which data is shared (or anonymized), enabling responsible but effective audience building and campaign optimization.

The key takeaways of server-side tagging

While server-side tagging is still a tag, it’s your tag. It’s a single script on your site that you own – sending data to your cloud or on-premise server. So you can feel comfortable saying “bye-bye” to third-party tags.

For more information on this subject, watch the video above with Ted Solomon, founder and CEO of CTRL Digital, and let us know if you have any questions.

Once you have this data on your server-side environment, you decide what you want to pass on to your marketing platforms. You can choose what data you feed the algorithms and remain in control.

The key benefits, as mentioned earlier, are:

• Improved campaign management: You have better campaign follow-up for users that have taken certain actions on your site. You can feed your algorithm with the data that you know is valuable so that your ad platforms are continuously optimized.
• Improved site performance: Your site’s performance improves because you’re not running a dozen scripts. Fewer tags in your website or app mean less code to run.
• More security and control of your data: You decide what data you want to share with third-party vendors. That data is safer when collected and shared in a customer-managed, server-side environment.

So, there you have it!

Server-side tagging is a fantastic way to improve your website’s performance, user experience, and what you share with other platforms.

Thanks for reading!

FAQs

What is Google Tag Manager?

Google Tag Manager (GTM) is a free tool that allows you to manage and deploy marketing tags (snippets of code) on your website or mobile app without having to modify any code directly. This makes it easier to track user behavior, collect data, and implement various marketing and analytics tools. Google Tag Manager supports server-side tagging with a dedicated server container. This container operates similarly to a traditional GTM container, using tags, triggers, and variables, but runs on a server instead of the client-side.

Key features and benefits:

• Centralized management: Easily add, edit, and remove tags from a single interface.
• No code changes: Update tags without needing to modify website code.
• Improved efficiency: Streamline tag deployment and reduce errors.
• Collaboration: Work with multiple team members on tag management.
• Versatile: Supports various tags, including Google Analytics, Google Ads, Facebook Pixel, and more.
• Free: No cost to use.

How it works:

1. Installation: Add two small snippets of code to your website or app.
2. Tag creation: Create tags for different marketing tools and define their triggers and conditions.
3. Deployment: Publish changes to your website or app.

Common use cases:

• Tracking website traffic and user behavior with Google Analytics
• Implementing conversion tracking for Google Ads
• Setting up remarketing campaigns
• Integrating social media pixels (Facebook Pixel, etc.)
• Managing other marketing and analytics tools

Overall, Google Tag Manager is a valuable tool for businesses of all sizes to optimize their marketing efforts and gain valuable insights into their audience.

How do I use Google Analytics together with server-side tagging?

Combining Google Analytics with server-side tagging gives businesses deeper insights into users' behavior while allowing them to improve data quality, and optimize marketing efforts. Here's how they can work together:

1. Data Collection:

• Server-Side Event Collection: Instead of relying on client-side events, you collect data on your server. This data can include page views, clicks, form submissions, purchases, and any custom events you define.
• Data Structure: Ensure the data collected adheres to GA4's event and parameter structure for optimal compatibility.

2. Data Sending:

• Measurement Protocol: Utilize Google Analytics' Measurement Protocol to send data from your server directly to GA4. This provides more control over data transmission and allows for advanced customization.
• Custom Dimensions and Metrics: Define custom dimensions and metrics to capture specific data points relevant to your business.

3. Data Processing:

• Server-Side Processing: Perform data cleaning, transformations, and calculations on the server before sending it to GA4. This enhances data accuracy and efficiency.
• Data Enrichment: Add additional context or information to the data based on server-side data sources.

4. Data Analysis:

• GA4 Reports: Leverage GA4's reporting capabilities to analyze the collected data. Explore user behavior, conversions, and other key metrics.
  Custom Reports: Create custom reports tailored to your specific needs using GA4's reporting interface.
• Audience Segmentation: Build custom audiences based on server-side data for targeted marketing campaigns.