Five TikTok captions, written for you.

The caption isn't the hook — the first frame of the video is. A caption's job is to extend the video by half a second. That's why short, specific captions out-perform long ones on TikTok. They read in the time it takes the video to loop once, and they prime the second loop with a tiny piece of context that would've been awkward to fit on-screen.

A few things our prompt nudges the model toward:

• Under 150 characters. Anything longer gets cut off behind a "…more" tap, and the tap rate is lower than you think.
• No restating the video. The viewer can see the video; the caption is for the bit the video can't say.
• No generic CTAs. "Follow for more!" is a tax on your engagement, not a booster.

The captions are generated by Gemini 2.5 Flash, Google's fast multimodal model. We feed it your topic and tone with a fairly specific system prompt: write for solo creators, never paraphrase the topic verbatim, vary the angles, keep it under 150 characters.

We picked Flash because it's quick enough to keep the page snappy and creative enough to surprise you once in a while. That said, AI captions are a draft. Read them out loud before you post — if you can hear the model in your head reading any of them, swap a word or two and make it sound like you.

• Friendly: the safe default. Works for almost anything — vlogs, recipes, lifestyle posts.
• Witty:use sparingly and only when the topic invites a joke. It's the hardest tone to get right and the easiest to misfire.
• Punchy: three to seven words. Best when the video does the work and the caption just plants a flag.
• Professional:the right call for B2B, educational accounts, and any brand that wants to stay out of the "extremely online" voice.
• Storyteller: opens with a hook, plants a question, lets the video answer it. Heavier reads but they earn their length.

We're not promising the model knows your audience better than you do. It can't see the video, it doesn't know your last week of content, and it doesn't catch the three-day-old in-jokes your followers love. What it's good at is breaking writer's block — giving you five reasonable starting points so you can edit instead of stare at a blank field.

If you find yourself posting an AI caption verbatim more than once a week, that's usually a sign the caption isn't doing enough work. Swap a word or two, drop a personal detail, and your captions stop sounding like everyone else's.

• TikTok Username Checker — confirm a handle before you commit to a new account.
• YouTube Tag Generator — same idea, for YouTube tags.