Character Limits for Every Major Social Platform
Every platform has a maximum post length, and for most writing it is irrelevant. The number that actually shapes a post is the truncation point: where the text is cut off and a reader has to tap to see the rest. The Social Media Character Counter checks a post against the current limits.
The limits, roughly
At the time of writing: Instagram allows about 2,200 characters in a caption and 150 in a bio, with a cap of 30 hashtags. X allows 280 for a standard account and far more - tens of thousands - for paid accounts. LinkedIn allows 3,000 in a post. Facebook allows over 60,000, which nobody has ever needed. YouTube allows 100 characters in a title and 5,000 in a description.
Platforms change these, sometimes without announcement, which is exactly why a counter is more reliable than a memorised number or an article. Treat the figures above as the shape of things rather than as current fact, and check before anything matters.
The number that actually matters
Instagram shows roughly the first 125 characters before "more". LinkedIn shows around 140 on mobile before "see more". Facebook cuts at about 250.
Which means the first sentence is doing nearly all the work. Everything after the cut is read only by people you have already convinced. That is a writing constraint, not a technical one, and it is the reason a good caption front-loads the point and leaves the context for afterwards.
The practical test: write the caption, then read only the first line and ask whether you would tap. If not, the first line is wrong, however good the rest is.
Where the limit genuinely binds
X, obviously, where 280 characters is a real constraint and where the discipline it imposes is arguably the point. A long argument has to become a thread, and the Thread Splitter handles the mechanics of numbering and splitting without cutting words in half.
Bios, where 150 characters forces ruthless editing - and where the Instagram Bio Generator is useful precisely because the constraint is tight.
YouTube titles, where 100 characters is the limit and search results typically show far less, so the useful words belong at the front.
Counting is not as obvious as it looks
An emoji usually counts as two characters rather than one, and some count as more - a flag or a skin-tone variant can be four or more. A link is often counted as a fixed length regardless of its real length. Line breaks count. And a count that includes spaces is the only one that matters, because every platform counts them.
Common questions
Does a longer caption perform better?
It depends entirely on the platform and the audience, and the evidence is mixed. What is consistent is that the first line determines whether the rest is read.
Do hashtags count toward the limit?
Yes, they are characters like any others. The Hashtag Counter checks the separate hashtag cap.
Why did my post get cut off mid-word?
Truncation does not respect word boundaries. Writing a complete thought inside the visible portion avoids it.
Want to check a post before you publish?