Social Caption Length Checker
Check a caption against every platform's character limit at once.
About this tool
Paste a caption or post and instantly see how it measures up against the character limit of every major social platform. Built for social media managers and copywriters drafting one piece of copy to share across X/Twitter, Instagram, Threads, Bluesky, Mastodon, LinkedIn, Facebook, TikTok, YouTube and Pinterest. It reports total characters, word count, characters excluding URLs, and an 'OVER by N' warning wherever you exceed a limit (including X's t.co 23-character link rule).
Frequently asked questions
What is the character limit for a tweet on X?
X/Twitter allows 280 characters. Every link counts as 23 characters regardless of its real length because X wraps URLs in its t.co shortener.
How long can an Instagram caption be?
Instagram captions can be up to 2,200 characters, while the bio field is limited to 150 characters.
Why does my count differ between platforms?
Each platform measures length differently and truncates at different points. This tool shows used/limit and remaining for X, Instagram, Threads, Bluesky, Mastodon, LinkedIn, Facebook, TikTok, YouTube and Pinterest so you can write once and post everywhere.