LinkedIn re-compresses uploads and is noticeably rougher on text than other platforms — which matters, because so much of what gets posted there contains text. Preset to 1200 × 630, the link-share and post size.
Preset to 1200 × 630 at quality 85 — text stays legible after LinkedIn re-encodes.
The cover banner is the one that catches people out. It is extremely wide and short, and it crops differently on mobile — keep anything important away from the left and right edges, because they disappear on a phone.
Most of this site recommends around 75. LinkedIn is the exception, and the reason is text.
A large share of what performs on LinkedIn contains words baked into the image — carousel slides, quote cards, charts, screenshots of data. Lossy compression damages hard-edged text before it damages anything else, producing the coloured fringing and mushiness that makes a slide look cheap.
Then LinkedIn re-encodes on top of whatever you uploaded. Starting at 85 leaves headroom, so your text survives their pass. For a photograph with no text, 75 is fine and you can drop it.
If you are posting a multi-slide carousel, upload it as a PDF document post rather than as a set of images.
LinkedIn renders PDF pages far more cleanly than it re-compresses uploaded JPEGs, so text stays crisp. Document posts also get their own swipe interface. Export your slides at 1200 × 1500 into a single PDF and upload that instead.
When you share a URL, LinkedIn does not use whatever image you feel like — it reads the og:image tag from that page.
So if your own article previews badly on LinkedIn, the fix is on your website, not in the post. Make sure the page has an og:image at 1200 × 630, referenced by an absolute URL — a relative path is the single most common reason a preview comes up blank. LinkedIn also caches aggressively; use their Post Inspector to force a refresh after you change it.
1200 × 627 for link shares and standard posts, or 1200 × 1200 for square. Cover banners are 1584 × 396 and profile photos should be at least 400 × 400.
LinkedIn re-compresses every upload, and it is particularly hard on text. Upload at the correct dimensions and a higher quality setting — around 85 — so your image survives their encoding pass.
1584 × 396. It crops differently on mobile, so keep important content away from the left and right edges or it will be cut off for phone visitors.
LinkedIn reads the og:image tag from the page you shared. The usual cause is a relative image URL rather than an absolute one. Fix the tag, then use LinkedIn's Post Inspector to clear their cache.