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UTM Builder — Free Campaign URL Builder for GA4, Plausible & PostHog

Build campaign-tagged URLs for Google Analytics, GA4, Plausible, PostHog. Validates URL and saves your last 5 locally.

Free No signup Client-side Privacy friendly

Recent (saved locally)

No saved URLs yet.

How to use

  1. 1 Paste your destination URL.
  2. 2 Fill in Source, Medium, and Campaign — these are the three required UTM parameters.
  3. 3 Optionally add Term (paid keyword) and Content (A/B variant or ad creative).
  4. 4 Copy the tagged URL and use it in your campaign.

Why use this tool

  • Standard UTM parameters supported by every major analytics tool — GA4, Plausible, PostHog, Mixpanel, Matomo.
  • Save your last 5 tagged URLs locally for quick reuse.
  • Validates URL format before generating output.
  • Pure client-side — nothing leaves your browser, no campaign data leaks.

Frequently asked questions

What are the three required UTM parameters?

utm_source (where the traffic comes from), utm_medium (the channel type), and utm_campaign (the campaign name). Term and content are optional.

Should UTM values be lowercase?

Strongly recommended. UTM values are case-sensitive in analytics tools — "Email", "email", and "EMAIL" become three different sources. Standardize on lowercase with underscores.

Can I tag a URL that already has query parameters?

Yes — the tool merges UTM params into the existing query string and overwrites any pre-existing utm_* keys.

Where is my saved history stored?

In your browser's localStorage on this device only. It never syncs to a server and cannot be accessed by other sites.

Summary

UTM Builder is a free developer utility by Zerethon Tools. Build campaign-tagged URLs for Google Analytics, GA4, Plausible, PostHog. Validates URL and saves your last 5 locally. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. UTM Builder runs entirely client-side — no server upload, no logging, no tracking of your input.

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