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AI caption generator — engaging posts for any platform
Generate captions for X (Twitter), Instagram, and LinkedIn using on-device AI. Pick a tone, describe your post, and get a caption with hashtag suggestions in seconds.
Describe your content
Tell the model what your post is about and pick a platform and tone.
Professional
Casual
Funny
Inspirational
Caption tips
Be specific about what's in the post.
Mention the mood or emotion you want.
Add context — audience, occasion, brand voice.
State the call-to-action you want at the end.
Platform norms
X (Twitter)
Concise, 1–2 hashtags, strong hook.
Story-driven, up to 30 hashtags, clear CTA.
Professional tone, 3–5 hashtags, industry insight.
Captions are generated locally in your browser. Nothing leaves your device.
Create engaging social media captions with on-device AI
The caption generator helps you write social posts that drive engagement. Whether you're posting on X, Instagram, or LinkedIn, it produces a caption tuned to that platform's length, tone conventions, and hashtag norms.
How it works
- 1. Describe your content. Tell the model what your post is about — a product photo, a team update, a quote, anything.
- 2. Pick a platform. X, Instagram, or LinkedIn — each has its own length and hashtag profile.
- 3. Set the tone. Professional, casual, funny, or inspirational.
- 4. Generate and refine. Copy the caption, regenerate for variations, or edit before posting.
Platform conventions
X (Twitter)
- 280-character limit
- Concise and punchy
- 1–2 hashtags
- Strong hooks
- Up to 2,200 characters
- Story-driven content
- 10–30 hashtags
- Clear call-to-action
- 3,000-character limit
- Professional tone
- 3–5 hashtags
- Industry insight
Why on-device AI
- Private: your description never leaves the browser.
- Free: no API costs, no rate limits, no signup.
- Fast: after the first model load, generation is near-instant.
Frequently asked questions
Everything that matters about how these tools work, and what we do with your data.