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Free AI Caption Generator

Generate platform-optimized captions for any social media post in seconds. Choose your platform, tone, and topic — AI does the rest.

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Editor's Note: We generated and tested these caption styles across 50+ accounts using TwinSync's Persona Mirror. Want captions generated automatically for your entire week? See how TwinSync works.

Frequently Asked Questions

Is the AI caption generator free?

Yes, completely free. You can generate up to 10 sets of captions per hour with no signup required.

Which platforms does the caption generator support?

We support Instagram, TikTok, LinkedIn, X (Twitter), YouTube, Facebook, Pinterest, and Threads. Each platform gets captions optimized for its unique format and audience.

How does the AI know what tone to use?

You select from five tones: casual, professional, witty, bold, and storytelling. The AI adapts its writing style, vocabulary, and formatting to match your chosen tone and platform.

Can I use these captions commercially?

Yes. All generated captions are yours to use for personal or commercial purposes. We recommend adding your own personal touch to make them uniquely yours.

How many captions do I get per generation?

Each generation produces 5 unique caption variations, giving you options to choose from or A/B test.

What AI model powers this tool?

We use Anthropic's Claude AI, known for high-quality, natural-sounding text generation that avoids the robotic feel of older AI tools.

Related Tools

Hashtag GeneratorPost Idea GeneratorBio GeneratorContent Calendar