One caption, every limit
Every network caps captions at a different length, so a post written for X's 280 characters reads very differently on Instagram's 2,200. This counter shows your live character count against every major platform at once — X (280), Bluesky (300), Threads (500), Pinterest (500), Instagram (2,200), LinkedIn (3,000), TikTok (4,000), YouTube (5,000) and Facebook (63,206) — so you can trim a post until it fits the tightest network you plan to publish to.
Counting is done by Unicode code point — the way the platforms themselves count — so an emoji or accented character is measured as a single character. Spaces, line breaks, punctuation, hashtags and mentions all count toward the total, because every platform includes them in post length. Alongside characters you also get word, sentence and line counts, a characters-without-spaces total, and an estimated reading time — handy for longer captions, threads and video descriptions.
Watch the feed cut-off, not just the hard limit
The hard limit is rarely the real constraint. Most feeds preview only the first part of a caption — about 125 characters on Instagram, and a line or two on Facebook and LinkedIn — before collapsing the rest behind a "more" link. Front-load your hook so it lands above that cut-off, then use the full length for context, links and hashtags. Everything here runs in your browser; nothing you type is uploaded.
Sources: caption limits follow each platform's own official documentation. Last verified June 2026.