Google Tag Manager

Dominant market leader in tag management with an estimated 30M+ website deployments globally

Google Tag Manager (GTM) is a free tag management system (TMS) developed by Google, launched in October 2012. It enables marketers, analysts, and developers to add, update, and manage JavaScript tags, tracking pixels, and other code snippets on websites and mobile apps through a centralized web-based interface — eliminating the need to manually edit site code for each new tag deployment. GTM supports hundreds of built-in tag templates from major advertising and analytics platforms, as well as custom HTML and JavaScript tags, making it one of the most versatile and widely adopted TMS solutions in the industry. As part of Google's Marketing Platform ecosystem, GTM integrates seamlessly with Google Analytics, Google Ads, Floodlight, and other Google products, while also supporting third-party platforms like Meta Pixel, LinkedIn Insight Tag, HubSpot, and many more. Its trigger and variable system allows for sophisticated conditional tag firing based on user behavior, page data, and custom events, enabling granular control over data collection and marketing measurement. The platform also offers version control, preview/debug modes, and multi-user collaboration features that make it suitable for both small businesses and large enterprise teams. GTM holds a dominant position in the tag management market, with estimates suggesting it is used on over 30 million websites globally, making it by far the most widely deployed TMS. Its free pricing model has made it the de facto standard for web tag management, particularly among SMBs and mid-market companies, while its enterprise-grade features and Google ecosystem integration also make it attractive to large organizations. GTM 360, part of Google Marketing Platform 360, offers additional SLA guarantees and support for enterprise customers.