Check one caption against Instagram, X, Facebook, LinkedIn, TikTok and Threads limits at once.
This tool checks a single caption against the character limits of Instagram, X, Facebook, LinkedIn, TikTok and Threads at the same time, so cross-posting the same text doesn't accidentally get cut off or rejected on one of the platforms.
Platforms differ enormously in how much text they allow: X caps posts at 280 characters, Threads at 500, while Instagram and TikTok allow up to 2,200 and LinkedIn allows up to 3,000. A caption written comfortably for Instagram can be many times too long for X, which is easy to miss if you're copying the same text across platforms quickly.
Write your caption once, paste it here, and check which platforms show a red "over" badge. For any platform that doesn't fit, either shorten the caption specifically for that platform or write a separate, tighter version rather than trying to force one caption to work everywhere.
Facebook's technical limit is extremely high, so in practice it's rarely the constraint — the real limit worth watching for cross-posted captions is almost always X or Threads.
Multi-Platform Caption Length Checker is built for creators, social media managers, small business owners and marketers who need a quick, reliable way to handle one specific job: check one caption against instagram, x, facebook, linkedin, tiktok and threads limits at once. Instead of digging through a bloated all-in-one dashboard or installing a browser extension, you get a single focused page that does exactly this one thing well, works the same way on desktop and mobile, and keeps your inputs on your own device rather than sending them anywhere else. If this is a task you find yourself repeating every week, bookmark this page so it's one click away next time you need it.
Whatever this tool hands you — text, an image, a calculated number, or a piece of code — treat it as a strong first draft rather than a final answer. Skim the result against the specific post, account or campaign you're working on, adjust anything that doesn't quite match your usual voice or brand, and only then copy it into the platform you're actually posting to. Because everything here runs locally in your browser, you can safely try several combinations of inputs back to back without worrying about rate limits, accounts, or data being logged anywhere — refresh the page any time to start over with a clean slate.
X (Twitter) at 280 characters is typically the tightest limit among these platforms, followed by Threads at 500 characters.
Yes, everything in the text box, including emojis and hashtags, counts toward each platform's total in the same way the platform itself would count it.
Yes, simply look at the row for the platform you care about — all platforms are checked simultaneously regardless of which one you're focused on.
No, the check happens entirely in your browser as you type, and nothing is transmitted or stored.