Google Tag Manager Setup

One GTM container
to run every tag.

A Meta Pixel pasted into the header, GA4 added by a previous provider, a Google Ads conversion hardcoded into the theme: it's the most common scenario, and the most fragile. I set up Google Tag Manager as the single management layer for all your marketing tags, so every addition or change happens in a few clicks, with no code changes and no impact on site speed.

I need this service →
5,0/5 · 65 verified reviews 50+ projects shipped 10 years

Google Tag Manager évite d'avoir à toucher au code du site à chaque nouvel outil de mesure, mais mal utilisé il devient un dépotoir : balises en double, scripts oubliés qui ralentissent le chargement, déclencheurs qui se marchent dessus. Un conteneur propre repose sur une couche de données pensée en amont — quels événements, quelles variables, quel nommage — plutôt que sur des balises empilées au fil des besoins. Je mets en place cette structure, je documente ce qui existe, et je fais le ménage dans les conteneurs hérités.

Le gain se voit sur deux plans : des données fiables, et un site qui ne s'alourdit pas à chaque campagne.

Features

What you get.

01

A single container for all your tags

Meta Pixel, GA4, Google Ads conversions and any other marketing pixel centralized in a single container, instead of being scattered and hardcoded into the theme.

02

Event-based triggers

Tags fire on precise events (click, scroll, form submission, add-to-cart) without a developer needing to touch code for every new marketing request.

03

Version control & rollback

Every change is versioned. If something goes wrong or a tag is misconfigured, roll back to the previous version in one click, with no risk to the live site.

04

Page speed preserved

Asynchronous, optimized loading of third-party scripts via GTM, instead of multiple blocking <script> tags scattered through the code, which drag down LCP and Core Web Vitals.

05

GDPR-aware tag firing

Every tag respects the visitor's consent choice: marketing pixels only fire when the corresponding consent has been given, in sync with your cookie banner.

06

Marketing team autonomy

Once the container is structured and documented, your team (or me under maintenance) can add a new pixel or adjust a trigger without a dev ticket or a production deploy.

Method

How we proceed.

01

Existing tags audit

Inventory of all scripts and pixels currently present on the site (often hardcoded), identification of duplicates and obsolete tags.

2-3 days
02

GTM container installation

Setting up the container across all pages, progressive migration of existing tags from source code into GTM.

2-3 days
03

Triggers & variables

Configuration of event-based triggers (clicks, scroll, forms, e-commerce) and the variables each tag requires.

1 week
04

GDPR consent integration

Connection with your consent banner so that each tag fires only according to the visitor's choice.

3-5 days
05

Testing, debug mode & go-live

Validation of each tag in GTM debug/preview mode, verification that nothing fires twice or is missing, then container publication.

3-5 days
FAQ

Frequent questions

Does GTM slow down my site? +
No, quite the opposite: properly configured, it loads scripts asynchronously and avoids multiple blocking tags. A site with scattered hardcoded scripts is often slower than one managed by a clean GTM setup.
What is the difference from adding GA4 or Meta Pixel directly in the code? +
GTM centralizes everything in one place: a single management point, clear documentation, the ability to roll back. Hardcoding each pixel multiplies the risk of error and makes every change dependent on a developer.
Is it compatible with GDPR consent banners? +
Yes, it's actually one of the main benefits: GTM can make each tag's firing conditional on the consent given, via Google's Consent Mode v2, in connection with Axeptio, Didomi or any other consent management solution.
How much does setting up GTM cost? +
On a creation or redesign project, installation is included. On an existing site with migration of scattered tags: €500 to €1,200 depending on the number of scripts to centralize and the complexity of the triggers.
See also

Related pages.

Stripe Integration PayPal Integration Google Ads Management Google Analytics 4 Setup
Let's start

Ready for your project?

Free quote within 48h. Response within 24h. No commitment.

Request a quote → See pricing