AI Caption Generator
Describe your photo or paste your post context, pick a tone, and get 5 caption options sized for X, ready to copy and post. Free, no login required.
What is an AI caption generator?
An AI caption generator writes captions for your photo or post. Describe the image or paste your context, pick a tone, and the AI returns 5 caption options sized for X, ready to copy and post, so you spend seconds on the caption instead of minutes.
How it works
1. Describe your post
Type a short description of your photo or paste the context of your post.
2. Pick a tone
Choose playful, professional, punchy and more so the captions match the mood.
3. Generate and copy
Get 5 caption options sized for X, each with a copy button. Pick your favorite.
Who it is for
Creators
Turn a quick photo or thought into a caption that earns the click, without staring at a blank box.
Indie hackers
Ship a build-in-public update and get a caption that frames the win in seconds, then post it and get back to building.
Agencies and social teams
Draft on-brand caption options for client posts fast, then refine the one that fits the campaign.
Do this at scale with OpenTweet
Great captions are just the start. OpenTweet writes your captions, schedules them, and posts to X automatically, from the dashboard or the API, so your feed stays active without the daily grind.
7-day free trial, then $11.99/mo. Cancel anytime.
Frequently asked questions
What is an AI caption generator?
It is a tool that turns a short description of your photo or post into ready-to-use captions. You pick a tone and get several options to choose from.
How do I use it?
Describe the photo or paste your post context, choose a tone, and click generate. You get 5 caption options sized for X, each with a copy button.
Is the AI caption generator free?
Yes, it is free to use, built by OpenTweet.
Are the captions the right length for X?
Yes. Captions are written to fit X's character limit so you can post them without trimming.
Can I control the tone of the caption?
Yes. Pick a tone before generating so the captions match the mood of your post, whether that is playful, professional or punchy.
Can I use these captions on other platforms too?
Yes. The captions work on Instagram, LinkedIn, Threads and Facebook as well, though they are sized with X in mind.