Do captions help YouTube SEO?
Yes. YouTube indexes uploaded SRT/VTT transcripts in its search index. A clean transcript lifts discoverability 20–30% over auto-captions.
Detail
YouTube is the only major video platform whose search engine reads uploaded captions as authoritative metadata. When you upload an SRT in YouTube Studio, YouTube treats the transcript as canonical: it indexes the text for in-video search, uses it to disambiguate the video's topic, and surfaces it to viewers as a clickable transcript. Auto-generated captions are also indexed but at lower confidence — proper nouns, technical terminology, and accented speech routinely get mistranscribed. A hand-corrected SRT typically lifts a long-form video's discoverability by 20–30%, especially for topic-specific search. Translated captions feed each language's search index independently.