# Track UTMs in OptinMonster Campaigns with UTM Grabber

## UTM attribution overview

Pass HandL UTM Grabber attribution into OptinMonster opt-in campaigns using hidden fields, campaign cookies, and UTM passthrough on success redirects.

### Approach

1. Add hidden fields to your OptinMonster campaign matching UTM Grabber parameter names
2. UTM Grabber fills matching fields automatically via its form population logic
3. On success, OptinMonster can redirect to a thank-you URL. Add `utm-out` on the redirect target to carry UTMs along.

### Hidden field mapping

Create hidden fields named `utm_source`, `utm_medium`, `utm_campaign`, `gclid`, `fbclid` in your campaign settings. UTM Grabber scans `input[name]` and populates from cookies.

See [Hassle Free Implementation](https://docs.utmgrabber.com/books/102-getting-started-for-handl-utm-grabber-v3/page/hassle-free-implementation-no-shortcode) for automatic field population.