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UTM link builder

Tagged campaign links with launch presets and a GA4 channel preview.

How to use it

  1. Paste the page URL. Existing query parameters and #anchors are kept.
  2. Pick a preset or fill the source. Presets set source and medium for common launch channels.
  3. Name the campaign. One name per push, like launch_2026, reused across every channel.
  4. Copy the link. Use it wherever you post. GA4 groups the visits under that source and campaign.

What UTM parameters do

UTM parameters are tags on the end of a link that tell your analytics where a visit came from. When someone clicks https://example.com/?utm_source=producthunt&utm_medium=referral&utm_campaign=launch, Google Analytics 4 records the session under that source, medium and campaign instead of guessing from the referrer, which many apps strip.

The five parameters

  • utm_source (required): the specific site or sender. producthunt, x, newsletter.
  • utm_medium: the type of channel. social, email, referral, cpc. GA4 uses this to sort traffic into channels like Organic Social or Email.
  • utm_campaign: the push. Use the same value on every channel for one launch so you can compare them.
  • utm_content: tells apart two links in the same place, such as header_link and footer_link.
  • utm_term: the paid keyword. Rarely needed outside search ads.

Naming that keeps reports clean

  • Lowercase everything. GA4 treats Newsletter and newsletter as two sources. This tool lowercases by default.
  • No spaces. Use underscores or hyphens. Spaces become + or %20 and split your data.
  • Write it down. Keep one list of sources and mediums and reuse it.
  • Never tag internal links. A UTM link from your own homepage starts a new session and overwrites the real source.

How it shows in GA4

Open Reports, Acquisition, Traffic acquisition and set the dimension to Session source / medium or Session campaign. The tool shows the channel group GA4 is likely to assign, based on Google's default rules: social sources land in Organic Social, email in Email, referral in Referral. A medium GA4 does not recognise ends up in Unassigned, which is the most common tagging mistake.

Launch week

Tag every link you post on launch day: your launch post, the maker comment, the newsletter, each social post. Then you can see which channel sent visitors who stayed, not just who sent the most clicks.

What you get

  • All five UTM parameters
  • Presets for Product Hunt, X, LinkedIn, newsletter, Reddit and Hacker News
  • Keeps existing query strings and #anchors
  • Lowercase and space cleanup
  • GA4 source, campaign and channel group preview

Questions

Which UTM parameters are required?

Only utm_source is strictly required. In practice also set utm_medium, so GA4 can assign a channel, and utm_campaign, so you can compare pushes.

Are UTM parameters case sensitive?

Yes. GA4 records Facebook and facebook as different sources. Lowercase every value and keep a shared naming list.

Do UTM parameters affect SEO?

Not when used on external links you share. Do not put them on internal links, and make sure tagged pages carry a canonical tag pointing at the clean URL.

Where do I see UTM data in GA4?

Reports, Acquisition, Traffic acquisition. Change the primary dimension to Session source / medium or Session campaign to see your tags.

Why is my UTM traffic showing as Unassigned?

GA4 could not match the medium to a default channel rule. Use standard mediums like social, email, referral, cpc or affiliate.