Facebook is extremely generous at 63,206 characters per post — so the limit is practically never the problem. The profile intro, at 101 characters, is very tight by contrast.
Something else matters more: in the feed your post is truncated with a "See more" link after around 477 characters. This counter shows you live where you stand.
Frequently asked questions
How many characters can a Facebook post have?
Up to 63,206 characters. In practice attention span is the real limit, not the technology.
When does a Facebook post get truncated?
In the feed after around 477 characters — beyond that it takes a click on "See more".
How long can the Facebook intro be?
The profile intro is limited to 101 characters.
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