Each platform sets its own limits. AeroReply checks your post against them in the composer, and again just before publishing. Captions are counted in characters, and video shows the longest clip allowed.
| Platform | Caption | Images | Video | Notes |
|---|---|---|---|---|
| 2,200 | 10 | 15 min | Needs an image or video, 30 hashtags max | |
| Threads | 500 | 20 | 5 min | 1 hashtags max |
| 63,206 | 10 | Yes | — | |
| 3,000 | 20 | 30 min | — | |
| X | 280 | 4 | 2 min | — |
| 800 | 5 | Yes | Needs an image or video | |
| Bluesky | 300 | 4 | Yes | — |
| TikTok | 2,200 | 35 | 10 min | — |
| YouTube | 5,000 | 0 | Required | 60 hashtags max |
| Google Business Profile | 1,500 | 1 | No | Needs an image or video |
Tips
- Write for the strictest platform first, then let the AI adapt the caption for the others.
- Instagram only accepts JPEG images for photo posts.
- YouTube needs a video. Pinterest, Instagram and Google Business need at least one image or video.
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