> ## Documentation Index
> Fetch the complete documentation index at: https://docs.postonce.to/llms.txt
> Use this file to discover all available pages before exploring further.
# Platforms at a glance
> Compare what PostOnce can copy from and publish to on Instagram, TikTok, YouTube, Facebook, LinkedIn, X, Threads, Bluesky and Pinterest: content types, caption limits, video lengths and daily caps.
Each platform decides what it accepts. This page compares them. Open a platform's guide for connection steps, settings and errors.
## What each platform supports
| Platform | Can be a source | Can publish | Checked every |
| - | - | - | - |
| [Instagram](/help/platforms/instagram) | Yes (Stories and Trial Reels if you turn them on) | Posts, carousels, Reels, Stories, Trial Reels. No text-only. | 5 min |
| [TikTok](/help/platforms/tiktok) | Yes, public accounts | Videos and photo posts. No text-only. | 10 min |
| [YouTube](/help/platforms/youtube) | Yes (Shorts; regular videos if you turn them on) | Videos only | 25 min |
| [Facebook Pages](/help/platforms/facebook) | Yes (Stories if you turn them on) | Text, photos, Reels, Stories | 10 min |
| [LinkedIn](/help/platforms/linkedin) | Company Pages only | Text, images, video | 15 min |
| [X (Twitter)](/help/platforms/x) | Yes | Text, images, video, GIF | 25 min |
| [Threads](/help/platforms/threads) | Yes | Text, images, video, carousels | 5 min |
| [Bluesky](/help/platforms/bluesky) | Yes | Text, images, video | 5 min |
| [Pinterest](/help/platforms/pinterest) | Yes | Image and video Pins. No text-only. | 10 min |
| [Google Drive](/help/platforms/google-drive) | No | Backup copies | |
When a post can't go to one platform, PostOnce skips that destination and publishes everywhere else. For example, a text-only X post is skipped for Instagram and TikTok.
## Key limits
| Platform | Caption | Video | Images per post | Daily cap |
| - | - | - | - | - |
| Instagram | 2,200 | 3 s to 15 min | 10 | 50 posts |
| TikTok | 2,200 (5 hashtags) | Up to 10 min, 4 GB | 35 | 14 posts |
| YouTube | Title 100, description 5,000 | 1 GB | – | Set by YouTube |
| Facebook Pages | 63,206 | Reels 3 to 90 s, 4 GB | 10 | – |
| LinkedIn | 3,000 | Up to 30 min, 500 MB | 20 | – |
| X | 280 (4,000 with Premium) | 2 min without Premium, 512 MB | 4 | 12 posts, 1 link |
| Threads | 500 | Up to 5 min, 1 GB | 10 | – |
| Bluesky | 300 | Up to 3 min, 100 MB | 4 | – |
| Pinterest | Title 100, description 500 | 4 s to 5 min, 2 GB | 5 | – |
Daily caps count any 24 hours. When a cap is reached, automatic posts wait for the next free slot. Captions longer than a platform's limit are cut at the limit.
## Things no platform allows apps to do
* Add trending music, stickers, polls or effects.
* Publish to personal Facebook profiles or personal Instagram accounts.
* Read posts from private accounts.
If a platform adds support, we'll add it too. Vote for it on the [feedback board](https://postonce.featurebase.app/).
## Still stuck?
Search this help center with ⌘ K, or email [support@postonce.to](mailto:support@postonce.to) from the address you use for PostOnce. Include the platform, the approximate time, and the exact message you saw. Never send passwords, access tokens, API keys, or card details.
Something missing from PostOnce? [Request a feature](https://postonce.featurebase.app/) or check the [roadmap](https://postonce.featurebase.app/roadmap).
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