Where practical having regard to the method of closed captioning, punctuation should be used to make closed captions as easy as possible for viewers to read. Punctuation should follow normal style and conventions. Punctuation should convey, as much as possible, the way speech is delivered.

Should subtitles have period?

Subtitling rarely uses periods. However, exclamation points and question marks are important if you want to keep the context clear. Commas, colons, semicolons, or apostrophes, makes phrases intelligible and emphasize ideas in the script. Think about reading a text without any punctuation.

How do you write a good closed caption?

Clear: A complete textual representation of the audio, including speaker identification and non-speech information, provides clarity. Readable: Captions are displayed with enough time to be read completely, are in synchronization with the audio, and are not obscured by (nor do they obscure) the visual content.