What is a UTM builder?

A UTM builder appends campaign tracking parameters (utm_source, utm_medium, utm_campaign, and optional term/content) to URLs so analytics tools like GA4 can attribute clicks from email and other channels.

What do utm_source and utm_medium mean?

utm_source is where traffic comes from (e.g. newsletter, brand). utm_medium is the channel type (e.g. email, cpc). utm_campaign names the specific promotion (e.g. spring_launch).

Can I bulk-tag multiple URLs?

Yes. In Links mode paste one URL per line. The same UTM fields apply to every line. Copy all results or download-style TSV (original tab result).

Does HTML mode change mailto links?

No. Only http and https href values are rewritten. mailto, tel, hash, and javascript links are left unchanged.

What does overwrite existing utm_* do?

When enabled (default), existing utm_* query params on a URL are replaced with your form values. When disabled, the tool only adds missing utm_* keys and keeps existing ones.

Is this UTM builder free?

Yes. The UTM builder on sendhtml.email is free with no sign-up. The html2email Chrome extension can help insert HTML email and manage links in Gmail.

UTM Builder

A UTM builder appends GA4 campaign parameters to links so you can see which email drove the click. Required tags are utm_source (who sent it), utm_medium (usually email), and utm_campaign (the promo name). This free tool tags bulk URLs or rewrites http(s) hrefs inside an HTML email fragment — then you copy the results into your send. Optional utm_term and utm_content distinguish keywords and creative variants.

Mode

Links HTML email

URLs (one per line)

utm_source *

utm_medium

utm_campaign *

utm_term (optional)

utm_content (optional)

Overwrite existing utm_* params

Live results

Enter URLs or paste HTML to see extracted links

Tagged links? Drop them into your HTML email — or insert the whole message with the extension.

Gmail/Yahoo

How to use the UTM builder

Choose Links (one URL per line) or HTML email (rewrite hrefs in a fragment).
Set utm_source and utm_campaign — add medium, term, and content as needed.
Copy URLs, TSV, or rewritten HTML into your campaign or Gmail message.
Optional: review link hygiene in the HTML email link guide.

Why UTMs matter for HTML email

Without UTM tags, GA4 lumps email clicks into generic referral/direct noise. Consistent utm_medium=email plus a unique campaign name lets you compare newsletter vs promotional sends and which CTA won.

In HTML email, every CTA should be an absolute https:// URL with tracking params already baked in — clients will not run your JavaScript to append them later.

Best practices checklist

Use lowercase snake_case values (spring_launch, not spaces)
Keep utm_medium=email for newsletter and promo sends
Give each send a unique utm_campaign
Use utm_content to A/B button copy or placement
Do not double-tag the same URL with conflicting campaigns

Related free tools

FAQ

Put tagged links into Gmail HTML

Copy URLs from this builder, or install html2email to insert full HTML emails in one click.

Gmail/Yahoo - Free

Link href guide · Free plan available