Publish and schedule LinkedIn posts with text and one image, video or PDF document.
FeedHorizon posts to personal LinkedIn profiles. Company pages are planned and not available yet.
Connecting an account
LinkedIn connects with LinkedIn sign-in (OAuth). Open Connections in the dashboard, or send a connect link (POST /api/v1/platform-invites with "platform": "linkedin", see Connect links).
FeedHorizon asks LinkedIn for openid, profile, email and w_member_social (post on the member's behalf). A LinkedIn connection lasts 60 days. Where LinkedIn issues a refresh token, FeedHorizon renews it automatically. Where it does not, you get the account.expiring webhook 7 days before the end, and the account turns needs_reauth once it has expired.
What you can post
| Limit | |
|---|---|
| Text | 3,000 characters |
| Files per post | 1 file, or none |
| Images | JPEG, PNG or GIF |
| Videos | MP4 |
| Documents | |
| File size | Up to 100 MB by URL import or 5 GB by upload. The platform may refuse large files when publishing |
PDFs are shown as a swipeable document post.
Text-only posts work too. WebP images and MOV or WebM videos are not accepted for LinkedIn; convert them first.
Example
curl -X POST https://feedhorizon.com/api/v1/posts \
-H "Authorization: Bearer fh_YOUR_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{
"profileId": "prof_…",
"content": "We just shipped scheduled exports.\n\nEvery report can now land in your inbox on a fixed day.",
"platforms": ["linkedin"],
"mediaIds": ["med_…"],
"scheduledFor": "2026-11-10T09:00:00+01:00"
}'After publishing
The LinkedIn target of the post carries the post URN in platformPostId (for example urn:li:share:7654321098765432) and the link in platformUrl.
Errors
Checked before the post is stored (400, see Error handling):
| Code | Cause | Fix |
|---|---|---|
content_too_long | More than 3,000 characters | Shorten the text, or give LinkedIn its own text in targets |
too_many_media | More than one file | Keep one image, video or PDF |
media_type_unsupported | For example a WebP image or a MOV video | Convert to JPEG/PNG/GIF or MP4 |
While publishing (in targets[].error, see Publishing errors). Rate limits and outages are retried automatically:
| Code | Cause | Fix |
|---|---|---|
account_needs_reauth | The connection expired or was revoked | Reconnect the account, then retry the post |
platform_auth_failed | LinkedIn refused the token or a permission is missing | Reconnect the account, then retry |
platform_rejected | LinkedIn rejected the post, for example as a duplicate of a recent post. error.message has LinkedIn's reason | Change the content, then retry |