The LinkedIn Post Preview is 100% client-side. Your text is analysed and rendered on your device in JavaScript, and an avatar you add is read locally with the browser’s FileReader — nothing is uploaded, logged or stored on a server. There is no backend, database or telemetry in the processing path, the tool works offline once cached, and closing the tab erases your work. The only optional network use anywhere on the site is consent-gated ads, which never see your post.

LinkedIn collapses a feed post after a short snippet and shows a greyed “…more” link. In 2026 that cut-off lands around 140 characters in the mobile app and about 210 on the desktop web feed. The exact point varies by device, app version, viewport width, language and whether the post carries an image, video, document or link preview, and an early blank line can shorten the snippet further. This tool renders the fold for both mobile and desktop so you can confirm your hook lands above it.

LinkedIn caps a single post at 3,000 characters. That is the hard limit, but length data suggests posts of roughly 1,300–1,900 characters earn the most engagement, while very short posts under ~400 characters tend to underperform. This tool counts your characters against the 3,000 limit in real time, shows a budget bar, and flags where your draft falls relative to the engagement sweet spot.

LinkedIn does not support rich text in posts, so the standard workaround is to swap normal letters for Unicode sans-serif bold or italic characters, which copy-paste into a post intact. This tool can convert your selection to Unicode bold, italic and add •, → or ✓ bullet lists that render across the app and web. Use it sparingly: these are styled characters, not true formatting, so they can render inconsistently and screen readers often cannot read them, which hurts accessibility.