Facebook Post Preview (Live “See More” Fold Check)

Facebook’s hard limit is the largest of any major network — long enough for a short story — which is exactly what makes it dangerous: with no technical pressure to be brief, the point sinks. The numbers that should shape your draft are the folds. On mobile, where most Facebook time is spent, posts collapse behind “See more” at roughly ~125 characters; on desktop the fold lands later, around ~477 characters. This card folds at the mobile number deliberately — it’s the stricter test, and the one most of your audience experiences.

Both cutoffs are approximate: line breaks, link previews, and the surface (feed, group, Page) all shift them. Treat the fold as a target zone and put the payoff well above it.

The card’s “See more” toggle works like the real one, so you can audit both reading experiences. Above the fold: does the first sentence carry the offer, the hook, or the question — or is it throat-clearing? Below it: does the expanded post reward the click, or repeat itself? Line breaks count as characters and shorten the visible portion, so a two-line hook can fold earlier than its character count suggests; the live counter and fold status under the textarea track both as you edit.

What the preview deliberately doesn’t do is pass as a real screenshot — it uses your own placeholder name and avatar, never a real account, with a non-affiliation note under the card. Fonts, spacing, and chrome vary across app versions and surfaces, so treat the card as a faithful approximation and the fold as a target zone, not a hard wall.

Run the draft through three gates: hook above the ~125-character mobile fold, full text under the 63,206-character cap (the easy part), and — if the post carries an image — a look at the card with the image in place, since the visual competes with your first line for attention. The Download PNG button draws a simplified version of the card with the Canvas API, entirely in your browser, for approvals and content calendars.

Facebook’s enormous allowance is also a cross-posting trap: a Facebook-length draft will be rejected outright by X or Bluesky. SocialKit’s composer shows every network’s limit while you write one post for all 11, so the long version and the short versions ship together, on schedule.