Post to LinkedIn from Zapier

Wire Zapier to one endpoint, then publish or schedule LinkedIn profile posts, company pages and documents from any trigger you already run — with a signed webhook for every delivery.

How it connects

A Webhooks by Zapier action, so any Zap trigger becomes a scheduled post. There is nothing to install on the Zapier side and no per-network module to configure — LinkedIn is a channel id in the request body.

POST https://api.postwharf.com/v1/posts
Authorization: Bearer YOUR_WORKSPACE_KEY
Content-Type: application/json

{
  "text": "Shipping today.",
  "channels": ["ch_your_linkedin_channel"]
}

A typical LinkedIn automation

The whole integration is a Webhooks action at the end of a Zap, with the fields mapped from the trigger. Trigger on a new row in a sheet, then queue the post rather than publishing it straight away:

{
  "text": "New this week",
  "channels": ["ch_your_linkedin_channel"],
  "publish_at": "2026-09-01T09:00:00Z"
}

Find the channel id once from GET /v1/channels — the one you want carries "platform": "linkedin". Text longer than 3,000 characters is refused with a 422 in your hand, rather than accepted and rejected by LinkedIn minutes later.

What LinkedIn accepts

Character limit3,000
Counted onthe post body
Formatsprofile posts, company pages and documents

Company Pages need an extra permission grant from LinkedIn beyond the personal profile scope.

Getting the result back

Register a webhook and every delivery outcome is posted to you — published, retrying, failed, or removed after publishing. Each is signed with HMAC-SHA256, so Zapier can verify it came from us before acting on it. That is the difference between a run that succeeded and a post that landed, and only the second one is worth a notification.

One thing worth setting up correctly

A Zap runs in a line, which makes it tempting to build one per network. Do not — every channel id goes in the same `channels` array, so five networks is one action, one Zap task, and one post carrying five receipts.

Questions

Can Zapier post to LinkedIn automatically?

Yes. Zapier calls one REST endpoint with a workspace key, so any trigger you already have can publish or schedule to a connected LinkedIn channel without a LinkedIn-specific module.

What do I need before LinkedIn will work?

Company Pages need an extra permission grant from LinkedIn beyond the personal profile scope. Once the channel is connected in PostWharf, Zapier reaches it the same way it reaches every other network.

How long can a LinkedIn post be?

3,000 characters, counted on the post body. PostWharf checks that before the post is queued, so an over-length post is refused immediately rather than failing at LinkedIn after everything else in the same batch has already published.