AI Caption Generator — Instagram / TikTok / LinkedIn
Model:
Generate platform-tuned captions for Instagram (2,200 chars), TikTok (150 chars), or LinkedIn (3,000 chars). Live character counter updates with platform limits, hashtag style picker (niche vs trending vs brand), emoji density slider, and CTA picker. Hashtag pills at the bottom — click to copy just the hashtags for paste-and-post workflows.
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Write Instagram, TikTok, or LinkedIn captions with platform-specific char limits, hashtag style, emoji density, and CTA pickers. Live char counter per platform.
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Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen7b", "messages": [{"role": "user", "content": "Write an Instagram caption for a product launch."}]}'AI Caption Generator — Instagram / TikTok / LinkedIn — FAQ
Free.ai Social Caption Generator writes platform-tuned captions for Instagram (2,200 chars), TikTok (150 chars), LinkedIn (3,000 chars), Facebook (5,000 chars), or Threads (500 chars). Live char-count bar, hashtag style picker (niche / trending / brand / mix), emoji density slider, and CTA picker. Hashtag pills at the bottom — click any one to copy just that tag.
Yes — Qwen 2.5 7B on our GPUs, about 100-300 tokens per caption. Free accounts get 10,000 signup tokens, enough for 30-100 captions. Premium models (Claude, GPT-5) use more tokens but return tighter hooks.
Later Social AI is $25+/month, Buffer AI $10/month, Canva Magic Write is a Canva Pro feature ($15/month), Captions.ai is $10/month mobile. Free.ai generates platform-tuned captions for free with platform-specific char limits baked in. No seats, no monthly commitment.
TikTok caps captions at 150 chars — if your caption is 800 chars from a generic generator, TikTok truncates with "…more" which hurts engagement. LinkedIn rewards longer-form thought-leadership up to 3,000. Our tool writes to the PLATFORM limit — TikTok stays tight, LinkedIn gets room to breathe, IG balances hook + body.
Niche (high-intent, small audience — best ROI), Trending (broad reach), Brand / campaign only (1-2 branded tags), Mix (2 broad + 3 niche + 1 branded — recommended default), None. The model follows the strategy you pick and places hashtags in the platform-appropriate spot (end for IG, inline for Threads).
Five levels: None, Minimal (1-2), Moderate (3-5 — recommended for IG), Heavy (6-10 — casual brands), Maximum (one every 1-2 lines). LinkedIn defaults to low emoji density; TikTok / IG tolerate more.
Yes — the "Copy hashtags" button pulls every hashtag from the caption and copies them as a space-separated string. Individual hashtag pills at the bottom are click-to-copy for paste-one-at-a-time workflows (common for Instagram first-comment hashtags).
No — first caption free, no email, no credit card. Sign up free for 10,000 signup tokens.
Yes — the output is an editable textarea with the char-count bar updating as you type. Green = under 90% of limit, orange = 90-100%, red = over limit.
Yes — pick from Save / Share / Comment / Link in bio / DM / Follow / Visit site / Sign up. The model weaves the CTA into the caption naturally (not as a stiff bolt-on) and places it at the end for platforms where that converts best.
Yes — all 99 Free.ai languages. Type your topic in Portuguese / Japanese / Arabic and the caption comes back in the same language with platform conventions respected.
Yes. POST to /v1/chat/ with the caption-generator system prompt. Useful for social-scheduling tools. Bearer auth, monthly limits. Docs at /api/.
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