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Per-platform editing is coming soon. Today a Rheos post has one body, and that body goes to every network selected on it, unchanged. There is no separate LinkedIn version and Instagram version of the same draft — the per-platform views are previews, and they’re read-only.
What is per-platform today is what Rheos shows you and what it checks: a preview skinned like each network, a character limit, a cap on how many images fit in one post, and a media rule for the networks that have no text-only post type.
Need genuinely different copy for two networks right now? Write two posts and select one network on each.

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Previews

Select Preview in the editor and you get one tab per selected network, each rendering your caption and media the way that platform will. The previews are read-only — you edit in the body, and every tab updates together. Three platforms have a second view:
  • Instagram — Post or Grid (Grid appears once the post has an image)
  • Facebook — Feed or Post
  • Pinterest — Pin or Board

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Limits per network

Mastodon takes images only — it has no video post type in Rheos.
Threads, TikTok and YouTube Shorts are coming soon. They appear in the composer’s platform list, but there’s no way to connect an account to them yet, so nothing can publish there. See connect social accounts.

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Character counting

The editor shows one tab per selected network. The counter under the body counts against whichever tab you’re on, so switching tabs changes the number you’re writing to. It starts on the first network you selected. Whichever tab you’re on, the post still has to fit every network selected on it. Going over any one of them disables Preview, Post now, Schedule and Confirm until you trim, so an over-length post can’t be sent at all. A red pill names the networks that are over — “X, Bluesky over limit” — and hovering it shows your count against each one’s limit.

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Media

Rheos does not crop or re-frame your media, and it never changes the aspect ratio you created it at. If a ratio matters, crop before you publish — otherwise the platform decides, and X centre-crops a 4:5 image. One exception, and it’s Bluesky. Bluesky rejects any image over 2 MB. On a scheduled publish Rheos handles that for you: it re-encodes an oversized image to JPEG and shrinks its longest edge until it fits, so framing survives but fine detail and file type may not. On Post now the file goes up as you attached it — if Bluesky rejects it for size, the post still goes out, just without that image. Keep Bluesky images under 2 MB and both paths behave the same. Every other network gets the file exactly as you attached it. Attach more images than a selected network allows and Rheos trims to the lowest cap as you attach, naming the network that set it.
Instagram and Pinterest have no text-only post type. Rheos blocks scheduling and publishing to them until the post has an image, carousel or video in the Attachments card. Add media, or untick that network for this post.

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Hashtags

Hashtags come from one list and go to every network — there’s no separate set per platform. How that list is trimmed depends on how you send the post, which is the one place the two publish paths differ:
Because a scheduled post isn’t trimmed, more than 30 hashtags on a scheduled Instagram post will be rejected by Instagram itself and that network will fail. Keep the list at or under 30 — and under 20 if Pinterest is selected — and both paths behave the same.
On X the 280-character limit bites long before the hashtag cap does.
Mentions aren’t supported yet. Typing @ doesn’t open a picker on any network — write the name as plain text.
Email support@rheos.app if anything looks off.
Last modified on August 10, 2026