How can I see which ad, platform or source a lead came from?

UTM parameters are built in: the classic UTM source and the other UTM values are captured on the form.

For more advanced attribution, use Click Tracking. Add your traffic source and select its template, for example TikTok ads, LinkedIn ads or Google ads. The template maps that platform's tracking parameters to our tokens and collects what attribution needs, down to which ad was clicked and the placement.

Using a click tracking link as each ad's destination also lets you compare clicks, conversions and purchases for each source in one place.