Write TikTok captions in your voice.
Upload your finished video and Captiv watches what’s actually in it, then writes three caption options with hashtags tuned for TikTok. Pick the one that fits, edit it inline, and it’s ready to post in about ten seconds.
Free to start · no login · built for TikTok video
An AI TikTok caption generator that sounds like you.
Captiv is an AI TikTok caption generator: you upload a finished video, Captiv looks at what’s actually in it, then writes three caption options — a hook angle, a story angle, and a value angle — each with a tuned set of hashtags and a one-line why, in about ten seconds, tuned for TikTok. You copy the one you like. It doesn’t post or schedule — it just writes the caption.
Captions are how TikTok recommends your video.
TikTok says the For You feed weighs your video’s information — described as details like captions, sounds, and hashtags — as one of the signals it uses to recommend videos. Your caption isn’t decoration; it’s part of what TikTok reads to decide who sees the video.
And it’s not about clout. TikTok says follower count and past viral videos aren’t direct ranking factors — what people do with your video is. A caption that earns a like, a share, or a comment feeds the strongest signal there is, which is exactly what Captiv writes toward.
Three steps. About ten seconds.
No prompt-wrangling — Captiv works from the video you already made.
Drop in your video
Upload your finished TikTok. No login needed for your first three captions.
Captiv reads it
The AI looks at what’s actually happening in your video — the moments, not the filename.
Get 3 captions + hashtags
Three angles, each with a tuned hashtag set and a one-line why. Edit inline, copy the one you like.
Everything your caption needs to land.
Hook-first
Every caption opens with a scroll-stopper, because the first line is what makes someone stay on your video.
Smart hashtag mix
Each angle comes with a tuned set of hashtags — broad plus niche — not a random pile of #fyp.
Sounds like you
On paid plans Captiv learns your voice from the captions you keep and edit, so it reads like you wrote it.
Made for video
Built for TikTok video — Pro and Studio analyze the full video before writing a single word.
Three angles
Hook, story, and value — three real options every time, so you pick the framing that fits the post.
About ten seconds
Three captions, three hashtag sets, and a why for each — in roughly the time it takes to reread your draft.
TikTok captions, answered.
Is the TikTok caption generator free?
Yes — three captions with no login, then five a month free with an account. Pro is $15/mo and Studio is $35/mo for voice matching, video analysis, and higher limits.
How does the TikTok caption generator work?
Upload your finished video. Captiv looks at what’s actually in it, then writes three caption options — hook, story, and value — each with hashtags and a one-line why, in about ten seconds.
How many hashtags should I use on TikTok?
Captiv gives each caption a tuned mix of broad and niche hashtags. TikTok lists hashtags as one recommendation signal, so relevance matters more than piling tags on.
Can it write TikTok captions in my own voice?
On Pro and Studio, Captiv learns your voice from the captions you keep and edit so they sound like you. The free plan uses a clean, TikTok-native voice.
What can I upload — does it work with video?
Captiv is built for TikTok video. Pro and Studio analyze the full video before writing; the free plan writes captions in a clean, platform-native voice.
Write your first TikTok caption
in about ten seconds.
Drop in a video and get three captions — hook, story, and value — with hashtags and a why for each.
Generate my caption — freeFree to start · no login · three captions on the house.