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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 Updated

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.

What is UTM Builder?

A UTM Builder is a tool that constructs campaign-tagged URLs by appending UTM query parameters such as source, medium, and campaign for analytics platforms including Google Analytics, GA4, Plausible, and PostHog. It runs in the browser, validates the base URL, and saves the last five built URLs locally for reuse. It is used to track marketing campaign traffic.

How UTM Builder compares to alternatives

UTM Builder versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
Signup required No Sometimes N/A
Campaigns leave device No Sometimes N/A
Analytics presets GA4 / Plausible / PostHog GA only N/A
URL validation Yes Sometimes N/A
Saves recent builds Yes (local) Rare N/A
Free Yes Yes (with ads) N/A
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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