What Is UTM? How to Build Campaign Tracking URLs — Analyze Marketing Performance in GA4

Among the links you've scattered across Instagram, search, and email, you've surely wondered which one drove the most visits. The thing that lets you analyze this is the UTM parameter. By appending source information to a URL, you can see channel-by-channel performance in GA4 and other analytics tools. This article covers how to build UTM tracking URLs the right way.

The 5 UTM Parameters

• utm_source — The traffic source. e.g., google, instagram, naver.
• utm_medium — The type of marketing. e.g., cpc, social, email, banner.
• utm_campaign — The campaign name. e.g., 2026_summer_sale.
• utm_term — Paid-search keyword (optional), utm_content — A/B creative differentiation (optional).

How to Build One — 1 Step

1. Enter your website URL plus source, medium, and campaign into the UTM Builder, and the tracking URL is built instantly. Non-ASCII campaign names are automatically and safely encoded as well.

Rules to Keep From Breaking It — Consistent Naming

• Use lowercase consistently — Naver and naver are counted as different channels. Always lowercase.
• Underscores (_) instead of spaces — In campaign names, use summer_sale rather than spaces.
• Consistent naming conventions — Always use the same name for the same medium so your reports stay clean. (The builder aligns this for you automatically.)

After You Build It

Shorten long tracking URLs with URL Shortener, and for offline or in-store promotion, turn them into a QR Code to post. (The builder links to these directly.)

Frequently Asked Questions

Q. Does adding UTM slow down my site?
No. It's just information after the URL and doesn't affect how the page works.

Q. Can I use non-ASCII campaign names?
Yes. The builder automatically URL-encodes them so they work safely anywhere. That said, English is recommended for report readability.

Q. Does GA4's utm_id work too?
Yes. You can include the campaign ID (utm_id) among the optional fields.