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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.

Features

Standard UTM parameters

Appends utm_source, utm_medium, utm_campaign, utm_term, and utm_content — the fields analytics tools read.

URL validation

Checks the base URL is well-formed and merges parameters without clobbering existing query keys.

No campaign telemetry

Builds run client-side; your last five URLs are stored only in your browser.

Example

Input

https://example.com/page + source=newsletter, medium=email, campaign=spring_sale

Output

https://example.com/page?utm_source=newsletter&utm_medium=email&utm_campaign=spring_sale

Common use cases

  1. 1

    Tag a newsletter link

    Attribute email traffic with utm_source=newsletter and utm_medium=email in your analytics.

  2. 2

    Track ad & social campaigns

    Distinguish paid, social, and referral traffic by campaign in GA4 or Plausible.

  3. 3

    Standardize team conventions

    Build consistent, lower-case UTM tags so reports don't fragment across spellings.

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 N/A
Summary

Zerethon's UTM builder constructs campaign-tagged URLs by appending the standard utm_source, utm_medium, utm_campaign, utm_term, and utm_content parameters, for Google Analytics / GA4, Plausible, and PostHog. It validates the base URL and saves your last five builds locally. Everything runs in your browser — your campaigns are never sent to us.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

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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