Facebook allows 63,206 characters and shows about 477

Facebook's hard limit is so high it stops being useful, so the counter above marks the number that actually matters: the point where the feed hides the rest of your post behind See more.

Paste your draft once and the same box reports counts for the nine other platforms, which is the quick way to catch a Facebook post that will never fit on X.

Facebook's post limit is 63,206 characters, comfortably the largest of any platform WriteOnce supports and large enough that it stops functioning as a limit. The number worth planning around is 477, which is roughly where the feed collapses a post behind a See more link.

That gap is the whole problem with writing for Facebook. Nothing warns you that a post ran long, it simply stops being read at the fold, and the analytics look like a content problem rather than a length problem. The counter marks the 477-character line so you can check whether your point survives above it before you publish.

Posts carrying a link have a second consideration. Facebook renders the link as a preview card that pulls its own title and description from the destination page, so repeating that headline in your post text spends visible characters on words the reader is about to see anyway. Say why the link matters instead, in a sentence or two.

Hashtags do very little on Facebook. One or two are enough to categorise a post, and more than that mostly signals the text was written for Instagram and pasted over. Page bios cap at 155 characters and that field appears in search results, so it earns more from reading as a plain description than as a slogan.