GUIDE · CROSS-POSTING
Pasting the same post everywhere breaks on the first try: a LinkedIn post can run 3,000 characters, Threads stops at 500 and Bluesky at 300. Here are the limits that matter, the order that saves time, and how to have each version written for you.
THE SHORT ANSWER
Write the full version for LinkedIn first, then cut a 500-character version for Threads and a 300-character one for Bluesky — keep the point in the first line, drop the detail, keep one link. Check media too: Bluesky takes up to 4 images (or one video), so a long carousel needs its best four slides there. Then post each version, or use a tool that publishes to all three.
| Threads | Bluesky | ||
|---|---|---|---|
| Text | 3,000 characters | 500 characters (emoji count as their UTF-8 bytes) | 300 characters as you see them |
| Links | Part of the 3,000 | Up to 5 per post | Part of the 300 |
| Images | Several, or a PDF document | Up to 20 photos or videos | Up to 4 images, or 1 video |
| Longer text | — | An optional text attachment (up to 10,000 characters) | — |
Write the long version first
Write for LinkedIn: the point in the first line, the explanation, the takeaway. It is easier to cut than to grow.
Cut a Threads version
Keep the first line and the strongest two or three sentences, under 500 characters. Conversational beats formal on Threads.
Cut a Bluesky version
Under 300 characters: the point and one line of why, plus the link if you need one — the link counts.
Fit the media
Bluesky takes four images or one video; Threads up to 20 items; LinkedIn a PDF document or images. Pick the best four slides for Bluesky.
Post — or schedule all three
Post each version, or use a tool that publishes to all three; Threads has had a public posting API since June 2024, and Bluesky's protocol is open.
Each feed rewards its own shape: LinkedIn rewards a clear first line and a worked explanation, Threads a quick conversational take, Bluesky a crisp point. The same idea, cut for each, reads as native everywhere.
WITH PAPERFLIGHT
Write once — or let your AI CMO write it — and PaperFlight's Writer makes a caption for each channel inside its limit, your sign-off included, and fits the media: a deck cut to the images a channel takes, the video where it plays. LinkedIn, X, Instagram, TikTok, YouTube, Facebook, Threads and Bluesky, from one approval.
PaperFlight is an AI CMO with its own team: it plans the week, writes and designs every post in your brand, publishes it to eight channels and learns from the results. 7 days free, no card.
Last checked 6 October 2026. Platforms change their limits and features often — check their help pages before you rely on a number.