How to add captions to videos automatically
Most short-form video is watched on mute. Captions aren't optional anymore — they're how people follow your video in the first three seconds. Here's how to add them automatically instead of typing every word by hand.
Why captions decide whether people keep watching
On TikTok, Reels, and Shorts, a large share of views start with the sound off. If your hook lives only in the audio, those viewers scroll. Captions put the hook on screen where it can't be missed, and they keep people reading — which is exactly the behaviour the algorithm rewards.
Captions also widen your audience: people in loud places, quiet places, and anyone watching in a second language. The effort-to-payoff ratio on captions is one of the best in all of short-form, which is why nearly every top creator uses them.
Manual vs automatic captioning
You can caption a video three ways, in rising order of speed:
- By hand — type every line and sync it to the audio. Accurate, but brutally slow; a few minutes of video can take an hour.
- Auto-transcribe, then place — a tool transcribes the speech and you drop the text on the timeline. Faster, but you're still positioning and styling.
- Fully automatic — the tool transcribes, times, styles, and burns the captions in for you. You review and tweak, not build from scratch. This is where Nova sits.
How automatic captions actually work
Auto-captioning runs your audio through speech recognition to get a word-level transcript with timestamps. Good tools then group those words into short, readable phrases, animate them so the active word pops, and render them into the video file itself so they survive re-uploads to any platform.
Nova does this as part of clipping: when it cuts a long video into shorts, it burns in animated, word-by-word captions automatically, styled to match short-form norms. You don't add captions as a separate step — they come with the clip.
Get captions right
Two things make captions look professional instead of amateur. First, keep them short — a few words per line, never a paragraph. Second, position them in the safe zone, clear of the platform UI at the bottom of the screen. Both are handled for you when captions are generated as part of the clip rather than slapped on afterward.
Want to try it on a real video? Paste a link into Nova's free clip finder and you'll see captioned moments before you sign up.
Turn your video into clips
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