Write once. Fit everywhere. All five platforms, live.
Five habits that separate posts that get read from posts that get scrolled past.
Instagram folds at ~125 characters — the tightest fold of the five platforms. If your first sentence works within 125 characters, it works everywhere. Draft the hook first, watch the Instagram card, then write the rest.
Every URL costs exactly 23 weighted characters on X no matter how short it looks. Two links eat 46 characters — a sixth of your budget. Consider posting the link as a reply to your own post instead: you keep the full 280 for the hook, and reply links don't suppress reach the way some in-post links can.
Unicode-styled text stands out in the feed, but screen readers spell it out letter by letter, and search inside the platform can't match it. One bolded headline earns attention; a bolded paragraph loses accessibility and findability.
Three or fewer on X, three to five on LinkedIn, and on Instagram put them in the last line or first comment rather than mid-sentence. Hashtags in the hook cost you readers before the fold.
Don't post identical text everywhere. Draft once here, then adjust per platform: shortest and punchiest for X and Threads, a line break after the hook for LinkedIn, caption-plus-hashtags for Instagram. The preview cards show you exactly where each version needs to flex.
Every social platform truncates, folds, or rejects posts differently. TapPreview shows how one piece of text behaves on X/Twitter, LinkedIn, Facebook, Instagram, and Threads — before you post it. Everything runs in your browser: your text and images are never uploaded anywhere.
X uses weighted counting: every URL costs a flat 23 characters regardless of its length, and most emoji and CJK characters cost 2. A post that "looks" 250 characters long can be over the 280 limit. TapPreview reproduces that weighting, including compound emoji (a family emoji counts as 2, not 8).
LinkedIn shows roughly the first 210 characters in the feed, Facebook about 400, and Instagram about 125 — the rest hides behind "see more." If your hook lands after the fold, most readers never see it. The preview dims everything below the fold so you can check your opening line.
They convert letters to Unicode mathematical alphanumeric characters that survive copy-paste into any platform. Note: screen readers may spell these out character by character, so use them sparingly — headlines, not paragraphs.
Platform limits change. The values here (X 280 weighted, LinkedIn 3,000, Facebook 63,206, Instagram 2,200 caption / 30 hashtags, Threads 500) are maintained manually — if a platform announces a change, the numbers update with the next release.