Platforms at a glance - PostOnce

Each platform decides what it accepts. This page compares them. Open a platform’s guide for connection steps, settings and errors.

The workflow builder listing Instagram, Facebook, X, LinkedIn, YouTube, TikTok, Pinterest, Threads, Bluesky and Google Drive — The platforms you can copy from (left) and publish or back up to (right)

What each platform supports

Platform	Can be a source	Can publish	Checked every
Instagram	Yes (Stories and Trial Reels if you turn them on)	Posts, carousels, Reels, Stories, Trial Reels. No text-only.	5 min
TikTok	Yes, public accounts	Videos and photo posts. No text-only.	10 min
YouTube	Yes (Shorts; regular videos if you turn them on)	Videos only	25 min
Facebook Pages	Yes (Stories if you turn them on)	Text, photos, Reels, Stories	10 min
LinkedIn	Company Pages only	Text, images, video	15 min
X (Twitter)	Yes	Text, images, video, GIF	25 min
Threads	Yes	Text, images, video, carousels	5 min
Bluesky	Yes	Text, images, video	5 min
Pinterest	Yes	Image and video Pins. No text-only.	10 min
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.

Still stuck?

Search this help center with ⌘ K, or email 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 or check the roadmap.

Last modified on October 7, 2026