Free tool
Instagram caption generator
Drop in what your post is about. Pick a vibe. Get three caption variations in 3 seconds. No login, no credit card, no AI-speak openers.
How it works
- Tell it what the post is aboutin one sentence. The more specific, the better. "New cardamom oat latte launching Saturday at our Mississippi Avenue cafe" produces a much better caption than "new drink".
- Set the vibe and the brand voice. Five vibes cover most small businesses; the brand voice field lets you pin three adjectives the captions should sound like.
- Pick a hashtag policy. None, three to five, or eight to twelve. The model picks niche-relevant tags rather than spam tags.
- Generate three variations. Short (one-line hook), medium (two to three sentences), long (with the call-to-action woven in). Tab through them, copy the one you want, paste into Instagram.
What this tool does not do (yet)
This standalone version writes captions. It does not generate the matching on-brand image, batch-generate a week of posts, maintain a structured brand profile across every post, or wire up the scheduling step. The full Sevenposts product does all of that in one workflow.
If you want all of it, join the Sevenposts waitlist. Or read the longer write-up: the eight things an AI tool for social media content creation actually needs to do.
Frequently asked questions
Is this Instagram caption generator really free?+
Yes. You get 2 free generations per day with no signup. Drop your email and that bumps to 5 per day. We do not ask for a credit card. We do not run ads on the page.
Which AI model writes the captions?+
We use Google Gemini 2.5 Flash. It is fast (under 3 seconds per generation), cheap to run, and produces captions that read like a thoughtful small-business owner wrote them, not like a bot.
How is this different from ChatGPT?+
ChatGPT works fine if you write a 200-line prompt every time. This tool ships that prompt for you. The form already encodes the brand voice direction, the hashtag policy, the length variations, and the rules against AI-speak openers like "Looking for..." or "Ready to...". You fill three fields, you get three captions.
Can the tool write captions in my brand voice?+
Yes. The brand voice field accepts three adjectives (e.g. "unhurried, restrained, confident"), and the vibe selector picks the overall register (friendly, witty, professional, minimal, playful). The full Sevenposts product (in waitlist now) takes a structured brand profile that produces fully consistent output across every post in a feed.
Will the captions sound generic?+
They will not start with "Looking for..." or "Ready to..." or any of the other AI-speak patterns. The system prompt explicitly bans them. Specificity comes from the input you give it, so write the post-subject field like a real sentence, not a vague keyword.
Does this generate the image too?+
Not yet. This standalone tool only writes captions. The full Sevenposts product (sign up for the waitlist on the home page) generates the matching on-brand image, the caption, and the hashtag set in one pass, batched across a whole week of posts.
How do I use the captions?+
Pick the variation that fits the post (short for hooks, medium for most posts, long when the call-to-action matters), copy it, paste it into Instagram. The hashtags are pre-formatted to drop on a new line.