Social Caption Length Checker

Every platform truncates at a different point, and the cut-off is what your caption is really competing against. Instagram collapses at roughly 125 characters behind a "more" link, LinkedIn at about 140 on mobile and 210 on desktop, Facebook around 125 before "see more". The hard ceilings are far higher — 2,200 on Instagram, 3,000 on LinkedIn — but almost nobody expands, so the visible window is the one that matters.

That makes the front-loaded portion the entire job. The first line has to work as a standalone hook, because for most of the audience it is the only line. Questions, a specific number, or an unexpected statement earn the tap; a windup that reaches its point in sentence three does not, since sentence three is behind the fold. Writing the hook last, once you know what the post actually says, tends to produce a better one than writing it first.

Longer captions are not inherently worse and on LinkedIn frequently perform better, because dwell time counts and a substantial post holds attention. The rule is that length must be earned after the hook, not spent before it. Draft a short core version that stands alone, then expand it for platforms where the extra room helps, rather than writing one long caption and trimming it for each channel.