AI Social Media Caption Writer
Write per-platform social media captions for Instagram, X/Twitter, LinkedIn, TikTok, and Facebook. Built-in template engine produces hook + body + CTA + hashtags + emojis with each platform's char-limit, hashtag, and style conventions. Tone presets, emoji density slider, hook variants, CTA library, niche + branded hashtag suggestions with shadowban-risk flagging, hashtag-in-first-comment tip, A/B caption pairs, thread/carousel mode, multi-language ready, history (last 20), favorites (localStorage), and shareable URL. 100% client-side — optional BYO-key LLM enhancement.
About AI Social Media Caption Writer
Write per-platform social media captions for Instagram, X/Twitter, LinkedIn, TikTok, and Facebook. Built-in template engine produces hook + body + CTA + hashtags + emojis with each platform's char-limit, hashtag, and style conventions. Tone presets, emoji density slider, hook variants, CTA library, niche + branded hashtag suggestions with shadowban-risk flagging, hashtag-in-first-comment tip, A/B caption pairs, thread/carousel mode, multi-language ready, history (last 20), favorites (localStorage), and shareable URL. 100% client-side — optional BYO-key LLM enhancement. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
How does the AI Social Media Caption Writer work?
Pick a platform (Instagram, X/Twitter, LinkedIn, TikTok, Facebook), enter your topic, choose a tone (bold, friendly, professional, playful, inspirational), and set an emoji density (none, low, medium, high). The tool composes multiple captions from a built-in per-platform template library, each with a hook line, body, CTA, emoji set, and a hashtag block tailored to that platform's length and hashtag norms. A live character meter flags over-limit captions.
How are platform character limits handled?
Each platform has a char limit baked in — Instagram 2,200, X 280, LinkedIn 3,000, TikTok 2,200, Facebook 5,000. The generator composes within the soft-target window for each platform (e.g., Instagram 138–150 chars is the sweet spot before the 'more' truncation; X is hard-capped at 280). Over-limit captions are auto-trimmed on word boundaries and flagged with a warning so you can edit before posting.
What hashtag features are included?
Per-niche hashtag suggestions (up to 30), branded-hashtag generation from your account name, shadowban-risk flagging against a bundled list of dated banned/risky tags (e.g., #anorexia, #costhings) so you can avoid them, and per-platform count guidance (Instagram 5–10, X 1–2, LinkedIn 3–5, TikTok 3–5, Facebook 0–2). The tool also surfaces a 'hashtag in first comment' tip for Instagram and TikTok.
Can I generate thread/carousel captions or A/B test pairs?
Yes. Thread mode splits a longer idea into a numbered X/Twitter thread (each tweet under 280 chars). Carousel mode produces 5–10 slide-ready captions for Instagram carousels. A/B pair mode generates a control caption and a challenger (different hook + tone) with a hypothesis explaining what it tests. Use these as starting points for real A/B tests; engagement depends on your audience and content mix.
What extra features does this tool have compared to others?
(1) 5 platforms (IG, X, LinkedIn, TikTok, Facebook). (2) 5 tone presets. (3) 4 emoji-density levels. (4) Live per-platform char meter with auto-trim. (5) Hook variant library (10+ hooks per tone). (6) CTA library (8 CTAs). (7) Niche + branded hashtag suggestions. (8) Shadowban-risk flagging (bundled list). (9) Hashtag-in-first-comment tip. (10) Thread mode. (11) Carousel mode. (12) A/B caption pairs. (13) Niche presets (12+). (14) Favorites (localStorage). (15) Copy + Download (text/JSON/CSV/Markdown). (16) Optional BYO-key LLM enhancement. (17) History (localStorage, last 20). (18) Shareable URL.
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