UTM Link Builder

Paste a URL and campaign details. You get a properly formatted UTM link plus a note on anything that would have broken your tracking.

What you get

• Case normalised to lowercase.
• Spaces become underscores instead of %20 noise.
• Characters that break tracking are flagged.
• Existing query parameters preserved.
• Collisions with an existing utm_source reported, not silently overwritten.

What to send

The URL plus source, medium and campaign: Link for https://example.com/pricing, source Newsletter, medium email, campaign Spring Sale. Optional: term and content.

Why it is cheap

Deterministic string handling, no model in the loop, so there is nothing to hallucinate.