Case file: one subtitle line, +19% conversions

Case file: one subtitle line, +19% conversions

A testimonial ad was already running fine. The only change: a single line of text burned onto the lower third quoting the speaker's strongest sentence.

— Conversion rate rose 19% with the overlay versus the clean version.
— Average watch time climbed 4 seconds — people read ahead, then waited to hear it.
— Sound-off viewing meant the silent majority finally got the proof point.

Why it works: most feed scrolling happens muted. A spoken testimonial with no on-screen text is a proof point delivered to nobody. The overlay turns your best line into something that lands without audio. File this under "captions aren't accessibility, they're conversion."