Free AI caption writer for TikTok and Instagram
Describe your post and get a platform-native caption — hook line, body, hashtag set, and CTA — written in the first-person voice that performs on TikTok and Reels.
What you get
- A structured caption: hook line + body + hashtags + CTA
- Platform-specific length and tone (TikTok vs Reels differ)
- Niche hashtag set — not generic tags that suppress distribution
Captions come with a niche hashtag set matched to your vertical — written for reach, never stuffed, ready to paste under the post.
What a finished AI ad looks like
Fifteen-second, fully AI-generated UGC ads — synthetic creator, voice, and product shots. Shared with permission. This is the bar your ads should clear.
The script
this blender just changed my morning routine. One knob, that is literally all you need. Glass jar, not plastic. You can actually see everything inside. Hear how quiet that is? First try. No chunks. Yeah. Worth it.
The script
Tell me why I have not waited in a Starbucks line in weeks. I literally order everything on the app before I even get here. My drink, my size, all my customizations, and it is ready when I walk in. It saves so much time and honestly makes my mornings easier. And yes, this is exactly what I was craving. You need to try it.
The script
Okay, I finally got the bag I have been thinking about for months. And honestly, it is even prettier in person. The size is perfect and the quality is insane. I already know I am gonna wear this with everything. Definitely one of my favorite purchases this year.
How it works
- 1
Describe your post
Enter what the video is about — the product, the creator's perspective, and the platform. The engine picks the right caption length and tone.
- 2
Get a platform-native caption
The output is a hook line, a short body (2-3 lines), a relevant hashtag set, and a CTA. TikTok and Instagram Reels have different caption norms — the engine handles both.
- 3
Copy, adjust, post
Copy the caption directly into your posting workflow. Hashtags are topical and niche-specific — not generic spam tags that suppress reach.
Start free, pay only for what you create
Sign up free — no credit card required. Scripts, hooks and captions are free to generate, and you see the exact cost before a single frame of video is rendered.
Start freeFrequently asked questions
- Does the caption announce it's AI-generated?
- No. The caption is written in first-person creator voice — it's the text that accompanies your post. The AI-disclosure label is on the video export itself, not in the caption copy.
- Why does TikTok caption style differ from Instagram?
- TikTok captions are shorter and hook-first because the interface cuts them off earlier. Instagram Reels captions can run longer and use more hashtags before the fold. The engine accounts for both.
- How many hashtags does it generate?
- Typically 5-10 hashtags — a mix of niche-specific and mid-tier tags. The engine avoids oversaturated tags (10M+ posts) that can suppress new-account reach.
- Can I use the caption for an AI-generated video post?
- Yes. The caption is written to work with disclosed-AI content — it doesn't claim authenticity that would contradict the video's AI label.
- Does this work for product posts or only lifestyle content?
- Both. Describe whether the post is product-focused or lifestyle, and the engine adjusts the body copy and CTA accordingly.
Related tools
Every creator on this platform is fully synthetic and AI-disclosed. Exports carry the visible AI label and Content Credentials. No real people, ever.