Threads adds text attachments up to 10,000 characters

Meta has begun testing a new text attachments feature on Threads that lets users append long-form text blocks — up to 10,000 characters — to regular posts. The move is aimed at journalists, creators and anyone who wants to share longer excerpts or mini-articles without creating multi-part Threads.

Key details

• Length: Up to 10,000 characters per text attachment.
• Formatting: Basic rich text options (bold, italics, underline) are available now; Meta says more formatting features are in development.
• View: On mobile, attachments open in a full-screen view; on web they open in a dedicated window.
• Link behavior: If a post contains a link, a preview of that linked post appears at the end of the text attachment.
• Fediverse: Text attachments are not compatible with ActivityPub/fediverse sharing — followers on other federated platforms won’t see them.
• Limitations: No embedded media inside attachments yet and limited layout controls; Meta plans more creator-focused updates.

Why this matters

The feature reduces the need for long threaded posts that can be hard to follow. Meta positions text attachments as a way for creators and journalists to share previews, excerpts, or longer commentary directly on Threads — potentially increasing on-platform engagement with longer-form content.

According to coverage of Meta’s announcement, the tool was inspired by users sharing screenshots of longer content like articles, book excerpts and transcripts.

For full details, see the TechCrunch writeup: https://techcrunch.com/2025/08/28/threads-tests-a-way-to-share-long-form-text-on-the-platform/

Will you use text attachments for long-reads on Threads? Share your thoughts below.