Captions get framed as an accessibility feature, and they are one — but treating them only as a compliance checkbox undersells how much they affect performance for every viewer, deaf or hearing.
The accessibility case
An estimated 1 in 8 adults in the US has some degree of hearing loss. Captions make your content usable for that audience without requiring any extra work on their end — the video simply works for them the same way it does for anyone else.
The reach case
The majority of short-form video is watched with sound off — on public transit, at work, in bed next to someone sleeping. A captionless video is effectively invisible to that entire audience, no matter how good the content is.
The SEO case
Captions and transcripts give platforms machine-readable text describing your video's content, which can factor into how your video gets matched to search queries and recommendations — something a purely visual/audio video gives algorithms nothing to work with.
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