How it works
What goes in and what comes out
You say what the post is about and add the facts, links or call to action it must include. An AI model (Llama 3.1 8B, run on Cloudflare Workers AI) writes three different TikTok captions in the tone, length and language (English or Vietnamese) you choose. Each draft has its own copy button, and "Write new drafts" asks again with the same brief.
The prompt describes how people write on TikTok: A hook in the first few words, casual and energetic, then three to five relevant hashtags. Emoji welcome.
Length
TikTok allows up to 4,000 characters in a caption (as of 2026). Each draft shows its count against that limit and is marked if it runs over, so you can trim it.
Short, Medium and Long aim for about 100–250, 250–600 and 600–1,200 characters, within any limit.
