Comparison

Twitter/X vs Threads vs Bluesky: Character Limit Comparison

Twitter/X, Threads, and Bluesky are the three dominant short-form text platforms in 2026 — and they've each chosen a different character limit. Here's exactly how they compare, side by side.

Head-to-Head Comparison

	Twitter/X	Bluesky	Threads
Post limit (free)	280 characters	300 characters	500 characters
Post limit (paid tier)	25,000 (X Premium+)	300 (no paid extension)	500 (10,000 with text attachment)
Bio limit	160 characters	256 characters	150 characters
Username limit	15 characters	Domain-based (no fixed cap)	30 characters

For the complete interactive reference with all fields for every platform, visit our all-platforms character limit cheat sheet — with 16 platforms in one page and links to dedicated tools for each.

Why the Limits Differ

Twitter/X's 280 characters is the historical anchor — doubled from the original 140 in 2017, and still the reference point every competitor positions against. Bluesky's 300 is a modest increase, aimed at giving slightly more breathing room without abandoning the "quick take" format. Threads' 500 characters (with a 10,000-character text attachment option) is the most generous, reflecting Meta's positioning of Threads as suited to slightly longer commentary than a pure microblogging format.

Which Platform Fits Which Kind of Writing

• Twitter/X (280): best for punchy, single-idea posts and real-time commentary where brevity itself is part of the format
• Bluesky (300): similar use case to Twitter/X, with just enough extra room to avoid mid-thought truncation on borderline posts
• Threads (500): better suited to a complete thought or a short explanation without needing to thread multiple posts together

Cross-Posting Between Platforms

If you cross-post the same content across all three, write to the tightest constraint first (Twitter/X's 280) and expand for Bluesky and Threads rather than writing for Threads' 500 characters and trying to cut down — trimming a Threads-length post down to 280 characters usually loses more than writing tight from the start.

See the individual guides for each: Twitter/X, Bluesky, and Threads.