Overview
Content Rabbit checks your post against each platform's rules before it publishes. If something is not allowed, you see an error per platform with what to fix. The same checks run when you schedule, when you publish now, and when the scheduler sends a queued post at its due time.
Per-platform limits
Limits differ by platform. Content Rabbit reflects what each platform accepts, for example:
- Character count — X/Twitter, LinkedIn, Facebook, Instagram, Threads, Bluesky, Pinterest, TikTok, WordPress, and Google Business each have their own maximum length. Mentions, links, and emoji count toward the total.
- Number of attachments — each platform allows a different maximum number of images or videos per post.
- Media type and size — allowed file types, maximum file size, dimensions, and duration for video vary by platform. An image that works on one platform may be too large or the wrong format for another.
You set content per platform tab in the composer. A message that is valid on one tab can be invalid on another, and only the affected platform shows the error.
Why a post fails validation
Common reasons:
- Text is too long for that platform
- Too many images or videos attached for that platform
- File type not supported on that platform
- File too large, too wide/tall, or video too long
- A platform account was disconnected or the post lost permission to publish there
Validation shows the rule that failed, for example the character limit and your current count, or the maximum attachments compared to how many you attached.
What happens when validation fails
- If you try to schedule or publish now and validation fails, the post stays as a Draft or Scheduled and does not go to Publishing. The error appears on the relevant platform tab so you can fix it before trying again.
- If a post was already scheduled and fails at its due time, it moves to Error. Open the post to see which platform failed and the exact message.
- Posts that publish to several platforms use per-platform results — one platform can fail while others succeed. The post shows Published with a failed platform row; you can fix and retry just that platform.
Fixing and retrying
- Open the post and switch to the platform tab that shows the error
- Read the validation message (for example the character count or the attachment limit)
- Shorten the text, remove or replace media, or choose a supported file type
- Save
Then:
- If the post is still scheduled, it will be tried again at its next due time, or you can publish it now.
- If the post is in Error, click Retry to re-send only the platforms that failed. Platforms that already succeeded are not sent again.
If a partial post keeps failing on the same platform for a long time, Content Rabbit stops retrying automatically and leaves the error for you to fix and retry manually. Check the error text and update the content before retrying.
Tips
- Preview each platform tab before scheduling — fixes are faster when you catch them per platform.
- Keep media under the strictest limit you target if you cross-post to several platforms.
- For repeated errors, duplicate the post to test a smaller version without losing the original — see Post actions & status.
Related articles
- Manage failed platforms and retry in Post actions & status
- Change timing without changing content in Moving & rescheduling posts
- Compose per platform in Composer