"A caption for every platform, in your tone — with the character count built in."
Tell the AI what your post (or profile) is about and it writes a version for each platform you pick. Because Facebook, Instagram, X, LinkedIn and TikTok all read differently, you get
A separate caption per platform, shaped to how people read it there
A live character count against each platform's limit, which you can edit as you like
One-click rewrites: make it shorter, funnier or more formal
You can also switch to Profile bio mode to write a bio that fits each platform's bio limit.
1What are you writing? (Mandatory)*
Powered by Google AI (Gemini). Always read and edit the result before you post — the AI can only work from what you tell it.
2Your captions
About This Tool
The same message rarely works unchanged everywhere. A Facebook post can be a few friendly paragraphs, an X post has to fit in 280 characters, a LinkedIn post usually reads more formally, and an Instagram caption leans on a strong first line. Rewriting for each place by hand takes time, so the Caption & Bio Writer does the first draft for you.
You describe the post, choose a tone and the platforms you care about, and Google's Gemini AI writes a version for each one within a sensible length. Every result is an editable text box with a live character count, and you can ask for a shorter, funnier or more formal rewrite. Bio mode does the same for profile bios, which have much tighter limits. The AI works only from your description, so treat the output as a draft: check the facts, add your own details and make it sound like you before posting.
How to Use It
01
Describe the post (Mandatory)
Write a sentence or two about what you are announcing or sharing. Include the key detail, such as a date or offer.
02
Choose the tone and platforms
Pick friendly, professional, witty or urgent, decide whether to include emojis, a call to action or hashtags, and tick the platforms you will post on.
03
Edit and refine
Change any word directly in the box. Use Shorter, Funnier or More formal to rewrite one result, and keep an eye on the count against that platform's limit.
04
Copy and post
Copy the version you want and paste it into the platform. For bios, check the platform's own bio field accepts it before saving.
Frequently Asked Questions
Is the caption ready to post as it is?
Treat it as a first draft. The AI only knows what you typed, so check every fact, add your own details and make sure it sounds like you before posting.
Why are the results different for each platform?
Each platform has a different length limit and reading style. A short punchy line suits X, while Facebook and LinkedIn can carry more detail.
Are the character limits exact?
They are the limits we last checked against published platform guides. Platforms change them occasionally, so confirm in the platform's own help pages for anything critical. The Character Counter tool shows more limits side by side.
Do I need to sign in?
No. The Caption & Bio Writer is free to use without an account.
What happens if the AI is unavailable?
A basic built-in writer creates a simple draft from your description and tells you it is doing so. It is less polished than the AI version, so try again shortly for a better result.
