Simple UTM conventions that keep your marketing analytics clean and reliable

UTM parameters lack built-in validation, meaning inconsistent tagging by team members over time can silently fragment analytics data into untrustworthy reports. Key rules include always using lowercase letters, hyphens instead of spaces or underscores, and appending the year to campaign names to avoid data stacking across recurring events. Marketers often confuse utm_source and utm_medium — source identifies the specific place (e.g., instagram), while medium describes the channel type (e.g., social). UTM tags should only be applied to external links, as tagging internal site navigation can overwrite original referrer data and corrupt attribution. Maintaining a short, team-accessible reference list of approved parameter values is recommended to prevent gradual naming drift across campaigns.