Platform Character & Word Limits
Every platform enforces its own character or word limit, and those limits change over time — sometimes without much announcement, as TikTok's own history below shows. Each page here states a headline figure, the date it was last checked, and the specific source it was checked against, rather than repeating a number that might already be stale.
Several of these pages also cover a distinction that trips people up constantly: the number you're technically allowed to write and the number that's actually visible to a reader without extra effort (a tap, a click to expand) are frequently two different figures on the same platform. Facebook's gap between the two is the most extreme on this list; Instagram's and LinkedIn's are smaller but still real. Each page below explains which figure matters for which purpose.
Every one of these pages also carries a live character-and-word checker preloaded to that platform's specific limit, so you can paste your draft and see instantly whether it fits — with the count updating as you edit, and a clear indicator when you cross from “fully visible” into “technically allowed but truncated.” As with every tool here, that checking happens entirely in your browser: the text you paste to test a caption or a title is never sent anywhere. Pick the platform you're writing for below to see its current limits, the reasoning behind them, and the checker.
- X (Twitter) Character Limit Checker280 characters for a free account, with a much larger (but less stable) allowance for Premium subscribers — plus the t.co link-shortening quirk that keeps long URLs from eating your budget.
- Instagram Caption Length Checker2,200 characters allowed, but only the first ~125 show before a reader has to tap "more" — the number that actually shapes how a caption gets read.
- Instagram Bio Character Limit CheckerA tight, fixed 150 characters with no truncation behavior at all — every character is always fully visible on the profile.
- YouTube Title & Description Limit CheckerTwo separate fields checked together at upload: a 100-character title and a 5,000-character description, each with its own display-truncation quirks.
- TikTok Caption Character Limit Checker2,200 characters today, though this is the one platform on this list whose limit has already changed once (up from an original 150) — a live example of why these figures need a verification date.
- Facebook Post Character Limit CheckerA nominal 63,206-character ceiling that almost nobody approaches, versus the roughly 477 characters actually visible before "See more" collapses the rest.
- LinkedIn Post Character Limit Checker3,000 characters allowed, with only the first 140-210 visible before truncation — short enough that LinkedIn's opening line functions almost like a headline.
- SEO Title Tag Length CheckerNo fixed character count at all — Google truncates by rendered pixel width, not by counting characters, which is why two same-length titles can display differently.
- Meta Description Length CheckerThe same pixel-width truncation mechanism as the title tag, applied to a wider strip of the search result — and the same honest caveat that Google often ignores it entirely.
- Amazon Listing Character Limit CheckerThree separately-limited fields (title, bullets, description) that genuinely vary by product category, plus a hidden backend-keyword field with its own byte limit.
- Common Essay & Assignment Word Count CheckerNot a single platform limit but a reference table of real, common assignment lengths — from the hard 650-word Common App cap to typical college paper targets.
- Google Ads Headline Character Limit CheckerExact character counts, not pixel-width truncation — 30 characters per headline, 90 per description, mixed and matched automatically across up to 15 headlines and 4 descriptions.