There’s no inherent character limit on the UTM parameters. But it's important to note that a URL that has fewer than 2000 characters will work with any combination of browser and web server.
So even though there’s no limit on any individual UTM parameter, collectively, along with the destination URL, there’s a limit of about 2000 characters on the final URL.
It’s a good practice to keep the UTM parameters short and meaningful.
Updated about 2 years ago