Limits per network
When Rheos publishes, the character limit follows the connected account, not just the
platform: Rheos checks whether your connected X account has X Premium, and if it does, X
takes up to 25,000 characters. The post editor still holds X posts to 280 characters for
now, so a longer X post can’t be sent from the editor yet.
Character counting
Rheos counts as you type, against the limit of the platform the post is going to. Go over it and Rheos names the platform, and Post now and Schedule stop working until you trim, so an over-length post can’t be sent at all. Hover a switched-off button to see why. On a Meta post the text has to fit both Instagram and Facebook, so Instagram’s 2,200 is the one that bites.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. Attach more images than the platform allows and Rheos trims to its cap as you attach, and tells you it did.Hashtags
Hashtags are kept as a list alongside the copy and added to the end of the post when it publishes. Instagram rejects posts with more than 30 hashtags, so Rheos sends only the first 30 there. Every other platform gets the whole list; on X the character limit bites long before the number of hashtags does.Mentions aren’t supported yet. Typing
@ doesn’t open a picker on any network — write the
name as plain text.