Threads gives you 500 characters and exactly one topic tag

The counter above measures your draft against the 500-character Threads limit and marks where the feed collapses it. Type or paste, and the number updates as you go.

Because the same box counts every platform at once, you can see immediately whether a Threads post also fits X's 280 before you cross-post it.

Threads caps a single post at 500 characters, sitting between X's 280 and Instagram's 2,200, and it catches people out in both directions. Writers arriving from X find the extra room and overfill it. Writers arriving from Instagram paste a caption and lose the last two thirds without warning.

About the first 180 characters show before the post collapses in the feed. Threads reads casually and rewards a conversational opening, so the shape that works is a short observation up top with the reasoning underneath, not the formal setup that suits LinkedIn.

Hashtags work differently here than anywhere else on this list. Threads allows exactly one topic tag per post and it functions as a topic label rather than a discovery multiplier. Adding a second does nothing at all, so the decision is simply which single word you want the post filed under.

When an idea does not fit 500 characters, Threads chains posts into a single thread instead of truncating. Splitting the draft yourself beats letting a paste get clipped, and WriteOnce's free thread splitter breaks text on sentence boundaries at either the 500-character Threads limit or X's 280. Your Threads bio is a separate 150 characters and usually works best mirroring your Instagram identity in fewer words.