What are UTM parameters?

Tags appended to a URL (utm_source, utm_medium, utm_campaign, utm_term, utm_content) that analytics use to identify traffic sources.

Which UTM fields are required?

Google Analytics requires at minimum utm_source, utm_medium, and utm_campaign. utm_term and utm_content are optional.

No. Everything runs in your browser. Nothing is sent to a server.

They are kept. UTM values are added alongside them, and an existing parameter with the same name is replaced rather than duplicated.

Yes. Spaces and punctuation are percent-encoded when the URL is built, and any field you leave empty is left out of the result entirely.

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What are UTM parameters?: Tags appended to a URL (utm_source, utm_medium, utm_campaign, utm_term, utm_content) that analytics use to identify traffic sources.
Which UTM fields are required?: Google Analytics requires at minimum utm_source, utm_medium, and utm_campaign. utm_term and utm_content are optional.
Does this store URLs?: No. Everything runs in your browser. Nothing is sent to a server.
What happens to query parameters the URL already has?: They are kept. UTM values are added alongside them, and an existing parameter with the same name is replaced rather than duplicated.
Are the values encoded for me?: Yes. Spaces and punctuation are percent-encoded when the URL is built, and any field you leave empty is left out of the result entirely.