YouTube Caption Generator
Tell it what the post is about (a sentence is enough) choose a tone and you get five captions to pick from. The description is for search and for viewers who want links. The first 157 characters show in results; chapters, links and credits go below. Edit anything, copy it, or schedule it straight to YouTube.
Results come from Claude, tuned per platform. Edit them: the best version is the one that sounds like you. We do not store what you type.
What makes a good YouTube caption
The description is for search and for viewers who want links. The first 157 characters show in results; chapters, links and credits go below.
YouTube shows the first three hashtags above the title. Add more than 15 and YouTube ignores all of them. Tags are separate from hashtags and live in the upload settings.
How to get better results
- Give a specific brief: "our spring menu, launching Monday, photo of the pistachio croissant" beats "food post".
- Name the audience if it matters: "for first-time home buyers", "for dentists".
- Put must-include words (a product name, a discount code, a link) in the "anything to include" field.
- Pick the caption that sounds most like you and cut the rest. Generated captions are a starting point, not the post.
Frequently asked questions
Is the caption generator free?
Yes. Ten generations a day without an account, and unlimited inside Social by InstantDM's composer.
Which AI does it use?
Claude, with a prompt written for each platform's length and style.
Do you store what I type?
No. The brief is sent to generate the captions and is not saved.
How long should a YouTube caption be?
Up to 5,000 characters, but under 70 so it is not cut off in search.
Related free tools
Write it here, publish it everywhere
Social by InstantDM schedules to YouTube and seven other platforms from one calendar, with AI captions, previews and an API. Start free — $0 today, cancel anytime.
Sign up for $0.00