Why Threads needs its own counter
Most counters count an emoji as 1 or 2 characters. Threads counts it as its UTF-8 bytes, so a post with a dozen emoji can be 30 or more characters longer than it looks, and a family emoji alone takes 18. This page counts the way Threads does, so a post that fits here fits on Threads.
The 5-link rule
Threads also limits links: a post may contain at most 5 different http or https links. Repeating the same link does not add to the count. A post over the cap fails when it is published, so check the links line before you schedule it.
Facts
- Threads allows 500 characters per post and counts each emoji as its UTF-8 bytes (Threads API docs, checked 2026-10-21).
- Threads rejects a post with more than 5 unique links (Threads API docs, checked 2026-10-21).
- PostBoost warns about both before a Threads post is published, with the same rules as this page.