What each platform accepts
Every platform has its own rules. Schedule & Chill checks your post against them before it is scheduled, so a post does not fail later.
The rules for each platform
| Platform | Text limit | Images | Video | Needs media | First comment | |
|---|---|---|---|---|---|---|
| 3,000 characters | Up to 9 | 1 | 1 PDF, up to 300 pages and 100 MB | No | Yes | |
| Bluesky | 300 characters | Up to 4 | No | No | No | No |
| Mastodon | 500 characters (your server may allow more) | Up to 4 | 1 | No | No | Yes |
| YouTube | 5,000 characters | No | 1 | No | Yes, a video | No |
No platform above accepts images and video in the same post. A PDF is always posted on its own.
When you post to several platforms at once
- The composer lets you attach only as many files as the strictest selected platform allows.
- If your post breaks a rule on one platform, the composer shows a message for that channel, for example Only 4 images per post — 6 attached. Fix it, remove that channel, or give that channel its own caption. See Different text for each channel.
How characters are counted
- X: every link counts as 23 characters and every emoji as 2.
- Bluesky: an emoji counts as 1 character, even complex ones.
- Mastodon: every link counts as a fixed number of characters set by your server, usually 23. Your server can also allow more text than the default.
- All others: every character counts as 1.
If a caption is too long, you see The caption is … characters; the limit is ….
Messages you may see in the composer
| Message | What to do |
|---|---|
| Needs at least one video. | Add a video. |
| Needs at least one image or video. | Add an image or a video. |
| Video isn't supported. / Images aren't supported. | Remove that media, or post it to a different channel. |
| Images and video can't share a post. | Use only images or only a video. |
| PDFs aren't supported. | PDFs work on LinkedIn only. |
| A PDF can't share a post with images or video. | Post the PDF on its own. |
| … is an audio file. Audio is stored in your library for editing, but it cannot be attached to a post. | Audio can live in your library but cannot be posted. |