Paste your caption once and see its live character count, words, sentences, and reading time against the listed platform limits.
Start typing to check your caption against each platform.
0 / 280
0 / 300
0 / 500
0 / 2,200
0 / 3,000
0 / 4,000
0 / 5,000
0 / 500
0 / 63,206
The standard X post limit is 280 characters. Count Twitter characters with the counter above, then leave room for the hook, mentions, hashtags, and any link you want readers to notice.
Instagram captions can be up to 2,200 characters, but the feed shows only the opening before a reader taps more. Put the useful context or hook first instead of filling the limit automatically.
LinkedIn posts support longer explanations, but the opening lines do most of the work in the feed. Use the full limit for a useful lesson, framework, or point of view rather than repeating the headline.
TikTok captions can hold more context than a short hook needs. Keep the first sentence specific, then use the remaining space for search-friendly detail and a natural call to action.
Threads allows 500 characters per post. Write a complete thought that can stand alone, then use replies when the idea needs more context instead of hiding the point at the end.
Bluesky posts are limited to 300 characters. Count the post including spaces, mentions, hashtags, and punctuation, then trim the setup before trimming the useful detail.
Facebook supports long post copy, but most updates work better when the opening makes the topic clear. Use longer posts for stories, explanations, or community context that earns the extra reading time.
YouTube descriptions can hold up to 5,000 characters. Put the video promise, important links, and any required disclosure near the beginning, then use the remaining space for chapters and supporting detail.
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. Use it as an Instagram character counter, a Threads character limit checker or a caption counter for any platform - the live count updates as you type.
Counting is done by Unicode code point, so many emoji and accented characters are measured as a single character. Platforms may apply their own rules to URLs, combined emoji, or weighted characters, so use this as a practical draft check rather than an exact platform validator. 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.
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.
Caption too long for X or Bluesky? Run it through the thread splitter to break it into numbered parts using your chosen limit.
Write once, tailor the caption where a network needs something different, and schedule the finished posts from one place.