AI Shorts Captions: Styles and Word-by-Word Highlighting

Here's a thing most creators learn the hard way: a lot of people decide whether to keep watching a short before they ever turn the sound on. Captions aren't decoration. They're the first thing a viewer reads, and sometimes the only thing they read.

AI Shorts treats them that way. Every short comes with captions burned in, in a style you pick, with every word timed to your voice and the spoken word highlighted as it's said. The viewer can follow along without sound, and with sound, their eye lands exactly where your voice is.

Pick a style before your shorts are cut

You choose the caption style before cutting, not after. The four styles are:

• Classic
• Bold
• Boxed
• Clean

Pick the one that fits the video. A church streamer might want something unobtrusive over a calm shot; a gamer might want something punchier over fast gameplay. There's no right answer in the abstract — the right style is the one that doesn't fight the footage.

One practical tip: use the same style across a run of shorts from the same stream or series. Viewers start to recognize your shorts before they read your name, and consistency is a big part of that.

How word-by-word highlighting works

Every word is timed to your voice. As you speak a word, that word lights up. The viewer isn't reading a block of text and guessing where you are in it — they're following you, word by word.

That timing matters for a second reason: it keeps captions honest. If a caption lags or runs ahead, viewers notice, even if they can't say why the short feels off. Timed, highlighted words keep the text and the voice locked together.

What languages are covered?

Transcription and captions work best in English, Spanish, French, German, Portuguese, Italian, Dutch, Russian, Hindi, and Japanese — including videos that switch between them. If your video bounces between two of those languages, the captions follow the switch rather than breaking on it.

What if a word is wrong?

It happens. Names, slang, and unusual terms are exactly where transcription is most likely to slip. That's what the web caption editor is for: fix any word the AI got wrong, change the text and highlight colors, and move captions up or down. Edits never use credits.

The step-by-step is in How to Edit AI Shorts Captions on the Web.

Captions are part of the short, not an add-on

A short from AI Shorts isn't a silent clip with text pasted on top as an afterthought. The captions, the hook line at the top, the title, and the hashtags are all part of the same package — they arrive together, and they're meant to be posted together. How the hook, title, and hashtags work is covered in AI Shorts Titles, Hooks and Hashtags: How to Post Your Shorts.

And if you're wondering how the moments themselves were chosen in the first place, that's How Castream AI Shorts Finds Your Best Moments.

The full feature overview is Castream AI Shorts: Turn Streams and Phone Videos into Vertical Shorts, and the feature page is Castream AI Shorts.