Platform limitations

The one place that spells out what each platform does and doesn't allow. Most limits come from the platforms themselves — we note where, so you know what to expect.

By platform

PlatformAccount neededNot supported / notes
FacebookA Page you adminNo personal-profile posting; no image-and-video in one post
InstagramBusiness or CreatorNo personal accounts; no Stories; videos post as Reels (90s max); caption links aren't clickable
LinkedInPersonal profileNo analytics yet; reconnect about every 60 days; Company Pages coming soon; no image-and-video in one post
TikTokAny accountPosts finish in the TikTok app (inbox); direct posting coming soon; totals-only analytics; Community plan
YouTubeA channelVideo only — no image posts
Custom webhookAny endpointSend-only (no analytics); Community plan

Caption & title limits

PlatformLimit
Facebook63,206 characters
Instagram2,200 characters
TikTok2,200 characters
YouTubeTitle 100 · Description 5,000
LinkedIn3,000 characters
Custom webhook100,000 characters

Media formats & sizes

  • Images: PNG, JPEG, GIF, WebP
  • Video: MP4, MOV
  • Not supported: HEIC, AVIF (convert to JPEG or PNG first)
  • File size: up to 100 MB (Free) or 500 MB (Community) per file. See Plans & limits.

Coming soon

  • LinkedIn Company Pages (and LinkedIn analytics)
  • TikTok direct posting (straight to your profile, without finishing in the app)
  • AI backgrounds inside Studio templates, and short video in Studio
Platform limitations · postme.live