LinkedIn post preview.

It cuts at a number of LINES, not a number of characters — about 3 rendered lines in the feed, on desktop and mobile alike. The narrower mobile column simply fits fewer characters into those same 3 lines, which is why one post can fold at 130 characters and another at 400: it depends on how wide your letters are and where your line breaks fall. A blank line costs a whole line of that budget, so a post that opens with a one-line hook and a blank line has already spent two thirds of its preview. LinkedIn does not publish the cutoff, so this tool measures it the way LinkedIn does — by laying your actual text out at the feed’s column width in LinkedIn’s own font and finding where the third line ends. Widely-quoted figures like “210 characters on desktop, 140 on mobile” trace back to copies of one another rather than to any LinkedIn document, and no single number can be right.

A single LinkedIn post (an update) allows up to 3,000 characters. Comments allow 1,250. Your headline allows 220. Those are the limits LinkedIn’s own composer enforces as of September 2026 — they are LinkedIn’s to change, so treat a hard stop in the post box as the final word. The counter here tracks the 3,000-character post limit and warns you if you go over.

Think in lines, not characters. You get about three rendered lines, and mobile fits the fewest characters into them — so write the hook, switch this preview to Mobile, and make sure it still lands. Avoid opening with a greeting or context; lead with the tension, the result, or the surprising claim. Spend your blank lines deliberately, because an early one costs a full line of the preview. And place a line break so the “…see more” arrives on a cliffhanger rather than mid-sentence. The card above shows exactly what is above the fold as you type.

Close, and honest about where it stops. It measures the way LinkedIn measures — your real text laid out at the feed’s column width in LinkedIn’s own font (14px on a 21px line), folded at the third rendered line — rather than guessing from a character count. Two caveats worth knowing: LinkedIn does not publish its exact column width or line count and adjusts them periodically, and everything here is modelled on LinkedIn on the web, not the iOS and Android apps. Browser zoom and OS text-size settings also move a real reader’s fold. Treat it as very close, not exact.

Free, no signup, no limits. Everything renders in your browser — your post text, name, and headline never leave your device and aren’t stored. Close the tab and nothing remains.