LinkedIn to Facebook looks like the easiest cross-post on paper: the caption budget balloons from 3,000 characters to 63,206, so nothing can possibly truncate, and both feeds happily take the same images and video. The catch is that the constraint was never technical. A LinkedIn post is written for people browsing under their job titles during working hours; the same text lands on Facebook in front of friends, hobby groups, and family photos — often from the same humans, in a completely different mood.
This guide covers the specs that genuinely differ (the folds, the link previews, the formats that don’t exist on the other side), what reads wrong pasted verbatim, and the workflow for adapting one professional post into a feed-native Facebook one — by hand, or composed once in SocialKit.
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Everything that changes between the two composers, side by side.
| Spec | LinkedIn (from) | Facebook (to) |
|---|---|---|
| Primary canvas | 1200 × 1200 px · 1:1 (post) | 1080 × 1350 px · 4:5 (post) |
| Caption limit | 3,000 characters (feed truncates after roughly the first 200) | 63,206 characters (feed truncates after a few lines with “See more”) |
| Video length | Native video up to roughly 10–15 minutes depending on where you upload | Long feed uploads supported (hours); Facebook Reels are far shorter — check the composer for your account’s cap |
| Hashtags | 3–5 professional tags is the convention; more reads spammy | Supported but lightly used — one or two at most reads native on Facebook |
| Visible before the fold | ~210 characters desktop / ~140 mobile before “…see more” | ~477 characters desktop / ~125 mobile before “See more” |
| Link preview card | 1200 × 627 px (1.91:1) from the page’s metadata | 1200 × 630 px (1.91:1) from the page’s og:image |
| Native long-form formats | Articles, newsletters, document (PDF) posts | Plain long posts; no document format — use photos or video |
The good news
The fine print
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Tip 1
Lead with the person, not the company: the same announcement framed as “what we shipped” on LinkedIn usually works better as “what I learned shipping it” on Facebook — identical facts, different protagonist.
Tip 2
Mind where your Facebook audience actually is: for many B2B topics it’s in Groups, not the feed. A trimmed, conversational version of your LinkedIn post offered in a relevant group (where rules allow) often out-travels the Page post.
Tip 3
Don’t fear short: pasting 3,000 characters because the box accepts 63,206 is the classic mistake in this direction. If the Facebook version is three sentences and a photo, that’s a feature.
FAQ
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Technically, always — Facebook’s 63,206-character limit swallows any LinkedIn post whole, and both feeds take the same images and video. Practically, the audiences read in different modes: the same person who engaged with your post professionally on LinkedIn is on Facebook for personal updates. Most cross-posters keep the substance and rewrite the register.
Never rejected and never cut — but it will fold. Facebook collapses posts behind “See more” at roughly 477 characters on desktop and around 125 on mobile, so on phones your visible window is actually smaller than LinkedIn’s. Put the hook in the first sentence and treat everything after as opt-in.
They don’t exist there. The closest conversions are a multi-photo post — Facebook tiles the images with the first one largest, so lead with the cover page — or a short video flipping through the pages. For text-heavy documents, a plain post with the key points often beats either.
On LinkedIn, 3–5 specific professional tags at the end of the post is the working convention. On Facebook, hashtags are supported but culturally marginal — one or two at most reads native, and many strong Pages use none. Neither platform publishes a ranking rule about them, so treat this as convention, not law.
Compose once, customize the caption per network, and let SocialKit publish to LinkedIn, Facebook, and 9 more platforms on schedule — no re-uploading, no copy-paste.
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