The answer is NO, but there is one case where cookies are actually used. Let me explain.
However, there is one situation where GTM sets cookies on your browser. It’s Preview and Debug mode. Once you enable it, an orange banner appears in the GTM interface. What happens in the background is that Google Tag Manager sets several first-party cookies that are essential for the preview mode to work.
If you have those cookies, the preview mode will be able to display what is happening on your website and what tags are firing. It is a necessary component for the Preview mode to work. Only you (or someone who also enabled the preview and debug mode) get those cookies.
And once you exit the preview mode, those cookies are deleted too.
GTM is capable of setting and reading cookies
One more thing. Google Tag Manager is a very flexible tool and it is capable of setting, reading and deleting 1st party cookies. This does not happen by default but you can configure it to do so. Here’s a guide about that.
On the other hand, tools that you implemented via GTM (for example, Google Analytics) are using cookies.
- Implement GDPR cookies consent notification via Google Tag Manager
- Set, read and delete cookies with Google Tag Manager