UTM Builder Free UTM generator

What are UTM parameters?

UTM parameters are short tags you add to the end of a link so your analytics tool knows where a visitor came from. When someone clicks example.com/?utm_source=newsletter&utm_medium=email&utm_campaign=2026-10_spring-sale, Google Analytics 4 records the visit as coming from your newsletter, through email, for the spring sale campaign. Without the tags, the same click often shows up as direct traffic or as an unhelpful referral.

This free UTM generator writes those tags for you. Some people call it a URL campaign builder, others a UTM code generator or campaign URL builder: it is the same job. The difference is in the checks. The tool fixes case, spaces and encoding, keeps your existing query string and #fragment in the right place, and warns you before a typo splits your reports in two.

The five UTM parameters

• utm_source - who sent the traffic: google, facebook, newsletter. Required.
• utm_medium - the type of channel: cpc, paid-social, email, social, referral. GA4 uses it to sort traffic into default channel groups.
• utm_campaign - the campaign or promotion name: 2026-10_spring-sale_us.
• utm_term - optional, usually the paid keyword or audience.
• utm_content - optional, the creative or link variant: banner-a, cta-footer. Useful for A/B tests.

GA4 also reads utm_id (a campaign ID for cost data imports), utm_source_platform, utm_creative_format and utm_marketing_tactic. Add them under Custom parameters if your team uses them.

A naming convention that keeps reports clean

GA4 treats Facebook, facebook and facebook.com as three different sources. Pick one set of rules and write it down:

1. Lowercase everything. The builder does this by default.
2. No spaces. Use hyphens inside a value (spring-sale) and underscores between parts (2026-10_spring-sale_us).
3. Keep a short list of allowed sources and mediums and reuse them. Do not invent e-mail one week and newsletter-email the next.
4. Put the date first in campaign names so they sort in time order.
5. Never put personal data such as an email address into a UTM value.

The campaign name helper in the builder applies these rules for you: type the period, the initiative and the audience in plain words and it returns a clean, sortable name.

How GA4 reads your tags

GA4 assigns every session to a default channel group, such as Paid Search, Paid Social, Email, Organic Social or Display, using the source and medium together. A medium like cpc or anything starting with paid counts as paid traffic; email lands in Email; social lands in Organic Social. A medium GA4 does not recognise, such as qr or print, ends up in Unassigned unless you create a custom channel group. The builder shows which channel your medium maps to, so you can spot this before the campaign goes live.

For Google Ads, turn on auto-tagging and link the account to GA4: the gclid parameter carries campaign, ad group and keyword data. Use UTMs on everything else: social posts, paid social, newsletters, partner links, QR codes and offline print.

Common UTM mistakes

• Tagging internal links. A UTM on a link inside your own site overwrites the original source, so sales get credited to your own banner. Use UTMs only on links that point to your site from somewhere else.
• Breaking the URL. A second ?, or tags placed after the #, means GA4 never sees them. The builder merges your tags into the existing query string and keeps the fragment at the end.
• Duplicate parameters. Pasting a link that already has utm_source and adding another gives two sources. The builder replaces the old value and tells you what it changed.
• Double encoding. A value that is already encoded, like spring%20sale, becomes spring%2520sale if encoded again. The builder decodes first.
• Breaking ad platform macros. Dynamic values such as {keyword} in Google Ads or {{campaign.name}} in Meta must stay unencoded. The builder leaves them as they are.

Need more free tools for marketing work? See the free AI generators and tools hub, including the free ad copy generator.

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