Paste a URL
The check runs as you type. Nothing is sent anywhere.
Checks: valid URL, source/medium/campaign present, capital letters,
spaces,
special characters, duplicates, empty values, mistyped parameter names, UTMs placed after #,
and
existing query parameters.
Check and fix UTM links before you publish
A single typo in a tracking link can split a campaign across several rows in Google Analytics 4, or hide it entirely. The BestUTM UTM checker validates any tagged URL in seconds and explains exactly what is wrong and how to fix it.
It looks for the mistakes that cause the most reporting problems: a missing utm_source, utm_medium or utm_campaign, capital letters, spaces and special characters, duplicated or empty parameters, mistyped parameter names, and UTM tags accidentally placed after a # fragment where analytics can never read them.
When something can be corrected automatically, the tool shows a cleaned-up URL you can copy or open in the UTM builder. It is a quick audit step for marketers, agencies and analysts, and it works with links from Google Ads, Meta Ads, LinkedIn, email platforms and QR codes alike.
Frequently asked questions
What does the UTM checker look for?
It validates the URL and checks that utm_source, utm_medium and utm_campaign are present. It also flags capital letters, spaces, special characters, duplicate or empty parameters, mistyped names such as utm_sorce, and UTM parameters placed after a # fragment.
Why do capital letters in UTM values matter?
Most analytics tools are case-sensitive, so Facebook and facebook appear as two separate sources. Keeping every value lowercase keeps your reports in one row.
Is my URL sent to a server?
No. The check runs entirely in your browser with JavaScript, so internal or unreleased links stay private.