The Complete Guide to Social Media Character Limits

Every platform enforces a character limit differently — some hard-cap what you can type at all, others let you type freely but fold the excess behind a "see more" link. Knowing which behavior you're dealing with changes how you should write.

Hard limits vs soft cutoffs

X enforces a genuine hard limit at 280 characters — the composer simply won't let you type past it. TikTok's 150-character caption limit works the same way. These are the platforms where going over isn't an option; you have to edit down before you can post at all.

Instagram, Facebook, and LinkedIn work differently. Their true limits are generous — Instagram allows 2,200 characters, LinkedIn allows 3,000 — but the visible preview is much shorter before a "more" link appears, usually somewhere between 125 and 210 characters depending on the platform and device. Here, the practical limit isn't the platform's rule; it's how much of your text a reader will see before deciding whether to expand it.

Why this distinction matters for how you write

For hard-limit platforms, the whole message has to fit — prioritize cutting anything non-essential. For soft-cutoff platforms, put the complete thought or hook in that visible preview window, and treat everything after the fold as optional depth for readers who are already engaged enough to tap "more."

Bios follow a separate, stricter set of limits

Profile bios are consistently shorter than post limits across every platform — Instagram's bio caps at 150 characters versus 2,200 for a caption, and TikTok's bio caps at just 80. The logic is the same everywhere: a bio is meant to be scanned in a glance on a profile page, not read like a post.

A quick reference

X posts: 280 characters, hard limit. TikTok captions: 150 characters, hard limit. Threads posts: 500 characters, hard limit. Instagram captions: 2,200 characters allowed, roughly 125 visible before folding. LinkedIn posts: 3,000 characters allowed, roughly 210 visible before folding. Facebook posts: over 63,000 characters allowed, but engagement tends to drop sharply past about 80 characters even though nothing forces a cutoff.

Rather than memorizing all of this, the practical habit is to draft in whichever platform has the tightest limit for your use case, then adapt outward — it's much easier to expand a message than to compress one that's already over.