Many people watch with the sound off, and captions make videos accessible to people who are deaf or hard of hearing.
Two short lines at a time, in the middle of the frame, timed to the speech.
Long lines in tiny text at the very bottom, right under the app’s buttons.
How to use it
Keep caption lines short (about one to two lines), timed so they’re on screen long enough to read comfortably, and high-contrast enough to read on any background. Check spelling of names and terms, because auto-captions get them wrong. Uploading an SRT or VTT file where the platform supports it also helps people who rely on captions control how they look.