What counts toward the Threads limit
Threads caps posts and replies at 500 characters. Spaces, line breaks, links and emoji all count. One detail matters near the limit: the Threads API counts emoji by their UTF-8 bytes, so an emoji can use more of the 500 than the single character you see here. If your post is close and uses emoji, leave a little room.
Links have their own rule. A post can contain up to five unique links, and since December 22, 2025 the API rejects posts with more.
For longer writing, Threads added text attachments on September 4, 2025. They hold up to 10,000 characters of long-form text alongside a short post.
Threads character limits
| Field | Limit (characters) | Notes |
|---|---|---|
| Post | 500 | Up to 5 unique links per post. |
| Bio | 150 | |
| Reply | 500 | |
| Topic tag | 50 | One per post, 1 to 50 characters, no periods or ampersands. |
| Text attachment | 10,000 | Long-form text attached to a post, available since September 4, 2025. |
Hashtags on Threads
Threads uses topic tags, one per post. Through the API a topic tag is 1 to 50 characters, with no periods or ampersands. If a post has several in-text tags, only the first valid one is used.
Tips for Threads posts
- Keep the post itself short and conversational, and move the long version into a text attachment.
- Add exactly one topic tag. If a post has several tags in the text, only the first valid one is used.
- Stay at five links or fewer per post.
- Answer replies quickly. Replies are posts too, with the same 500-character limit.
- Through the API, each profile can publish 250 posts and 1,000 replies in 24 hours, and a carousel counts as one post.
Publish Threads posts that fit, on schedule
Postocial publishes to Threads alongside your other networks. Write the Threads version in the same composer as a longer LinkedIn or Facebook version, so each network gets text that fits, then schedule both at once. Replies from Threads come into the unified inbox on Premium and higher plans.
See how Postocial works with Threads.
Sources
The Threads limits on this page come from these pages. Researched on . Networks change their limits without notice, so check the official pages before a big launch.