What landing page elements actually affect PPC conversion rates?

Headline and message match
The headline must reflect what the ad promised. If your ad says "Free trial for 30 days" but the page headline says "Start your subscription," visitors feel misled and leave. This is one of the highest-impact elements. Test headlines that reinforce the ad's core promise, not generic promises.
Form length and fields
More form fields mean more friction. Each additional field you ask for reduces completion rates. Test removing optional fields. Collect only what you truly need to move forward. This consistently improves conversion rates in testing.
Call-to-action button text and placement
Button text should be specific ("Start free trial" instead of "Submit"). Placement above the fold generally outperforms buttons below scroll. Test button colors cautiously—color matters less than specificity and placement.
Trust signals
Elements like customer logos, testimonials, security badges, or money-back guarantees can lift conversions, but only if they feel authentic. Generic trust badges don't move the needle much.
Page speed
Slow pages lose visitors. If your page takes more than 3 seconds to load, people leave before seeing your offer. This affects conversion rates directly.