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PostOnce can copy your Instagram posts to other platforms, and publish posts from other platforms to Instagram. It works with Business and Creator accounts.

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Connect Instagram

The Instagram row on the Accounts page with the Connect Instagram button
  1. On Accounts, click Connect Instagram.
  2. Sign in to Instagram and approve access. You don’t need a Facebook Page.
Personal Instagram accounts can’t be connected. Switch to a Professional account in the Instagram app under Settings and privacy › Account type and tools, then connect again.
If Instagram leaves you on instagram.com and never returns to PostOnce, click Connect Instagram again. PostOnce then opens Instagram’s full login page, which completes the connection. This also happens after switching to a Business or Creator account. To connect a second Instagram account, the same full login page lets you choose which account to sign in with.

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Instagram as a source

Content to include for an Instagram source: Photos and carousels, Reels, Trial Reels and Stories

Choose which Instagram content a workflow copies

  • Photos & carousels and Reels are included by default.
  • Trial Reels (Reels shown to non-followers first) and Stories are off by default. Turn them on in the workflow or under Settings › Source.
  • Stories are copied as Stories to Instagram and Facebook destinations, and as normal posts everywhere else.
  • PostOnce checks Instagram for new posts every 5 minutes.
  • If the original is deleted, archived or made private before PostOnce copies it, the post is skipped.

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Publishing to Instagram

Limits Videos wider than 1920 pixels or larger than 300 MB are resized before publishing. Line breaks in captions are kept.

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Instagram settings in a workflow

Open the workflow, click Settings › Destinations and pick the Instagram account:
  • Publish as Trial Reels sends single-video posts as Trial Reels, shown to non-followers first. Images and carousels are not sent to that account. Share the Trial Reel to your followers yourself in Instagram.
  • Post everything as Stories posts every single image or short video as a Story. Carousels, text-only posts and videos over 60 seconds are skipped. Trial Reels and Stories can’t both be on.
  • Remove @mentions from captions removes the @ from usernames so other accounts aren’t tagged. Email addresses are left alone.
  • The caption options and Set time between posts work as described in Captions for each platform and How fast posts publish.
Without a gap set, PostOnce waits 5 minutes between automatic Instagram posts. Posting faster can get the account temporarily blocked by Instagram.

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What Instagram doesn’t allow

  • Links in captions aren’t clickable on Instagram. Use “link in bio” instead.
  • Music, stickers and polls can’t be added through Instagram’s API.
  • Text-only posts can’t be published.

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Instagram errors

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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