Free Instagram and TikTok Caption Generator
Describe your post or video, pick a platform and tone, and get 5 ready-to-post captions with hashtags. Built for Instagram and TikTok, and it also writes for YouTube Shorts, X, Threads and Facebook. Free, no signup.
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Why captions matter for social media growth
Great visuals stop the scroll. Great captions start the conversation. Instagram's algorithm prioritizes posts that generate comments and saves, and that starts with a caption that gives people a reason to engage.
On TikTok, the video does the talking, so the caption has one job: give people a reason to keep watching or to comment. The best TikTok captions create curiosity ("Wait for it..."), ask a question, or use a phrase the audience already searches for.
For AI influencer accounts, captions bridge the gap between generated visuals and authentic engagement. A well-crafted caption makes AI content feel intentional, not robotic. Pair these captions with content from Influverse's AI character creator for a complete content workflow.
TikTok Caption Generator
Pick TikTok and the generator writes 5 captions under 150 characters, each with 5 hashtags. Short is deliberate: a TikTok caption sits over the video, and the words that get read are the first few.
- Describe what happens in the video in a sentence, for example "a 20 second recipe for crispy chickpeas".
- Choose the tone your account uses, then generate.
- Pick the caption that makes someone want the ending, and paste it with its hashtags.
Caption writing tips by platform
Instagram (up to 2,200 chars)
Lead with the hook in the first line, it's the only part visible before "More." Use 10 to 15 relevant hashtags. Add a CTA (question, poll, or save prompt). Line breaks improve readability.
TikTok (the generator keeps it under 150 characters)
Keep it punchy. Use trending sounds and phrases. 3 to 5 hashtags. The caption should complement the video, not describe it. Curiosity gaps ("Wait till the end") drive watch time.
YouTube Shorts (a title of up to 100 characters)
The title IS the caption. Make it searchable, include the topic keyword. Keep it short enough to read in full on a phone. 2 to 3 hashtags in the description.
X (up to 280 characters on a standard post)
Ask a question or take a clear position. If you post a thread, an image in the first post can help it stand out. 1 to 3 hashtags at most: more looks spammy on X.
Complete your content workflow
Captions are just one piece of the puzzle. With Influverse AI, you can generate the visuals, create videos, write captions, and schedule everything to post automatically, all from one dashboard.
1. Generate your visuals
Create AI character images with the character generator, consistent identity across every post.
2. Turn images into videos
Animate your images with the AI video generator, lip-sync, native audio, and motion control included.
3. Write your captions
Use this tool to generate platform-optimized captions with relevant hashtags.
4. Schedule and publish
Push everything to TikTok, Instagram, YouTube, and more with the built-in scheduler.
Frequently asked questions
Is the AI caption generator really free?
Is there a free TikTok caption generator?
How long should social media captions be on each platform?
How many hashtags should I use per platform?
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