A month of LinkedIn posts from one ChatGPT chat
Ask ChatGPT for a content plan, approve the topics, and let it create every LinkedIn post on the calendar. You review each one before it goes out.
LinkedIn publishing specs
Limits Postika checks before scheduling
| Caption length | 3000 linkedin.com |
|---|---|
| Images per post | 20 learn.microsoft.com |
| Image formats | JPG, PNG, GIF learn.microsoft.com |
| Image size | < 36,152,320 px learn.microsoft.com |
| Video formats | MP4 learn.microsoft.com |
| Min video length | 3 s learn.microsoft.com |
| Max video length | 30 min learn.microsoft.com |
| Max file size | MP4 500 MB learn.microsoft.com |
| Alt text | 4086 learn.microsoft.com |
Official limits from the network's documentation (checked November 5, 2026). Postika enforces its own limits where they are lower.
Step by step
- 1
Ask ChatGPT for a month of LinkedIn topics around 3 or 4 themes.
- 2
Review the list and remove or change topics.
- 3
Ask ChatGPT to write and create each post on your posting days, pending approval.
- 4
Each week, review the pending posts in Postika and approve them.
Example prompts
- We are a 12-person accounting firm. Propose 12 LinkedIn post topics for December around three themes: year-end tax tips, team, client wins.
- Write posts 1 to 12 and create them on Mondays, Wednesdays and Fridays at 08:00 starting next week, pending approval. Under 1,300 characters each.
- Write a hiring post for a junior designer: what the job is, who the team is, how to apply. Pending approval tomorrow at 10:00.
- Rewrite Wednesday's LinkedIn post with a stronger first line and create it again as a draft.
- Write a LinkedIn post that presents our 5-step onboarding as a list, with room for 5 images I'll add. Pending approval Thursday 09:00.
LinkedIn limits ChatGPT works with
| Rule | Postika |
|---|---|
| Text | 3,000 characters |
| Images | Up to 9 |
| Video | One per post |
| Text-only | Allowed |
Text-only means ChatGPT can schedule LinkedIn posts directly. Images for a multi-image post are added in Postika because the connector only carries text; see multi-image posts. Formatting notes in LinkedIn scheduling.
Plan the themes, then batch
Asking for "a LinkedIn post" every morning produces generic posts. A plan works better: three or four themes, a rhythm (for example Monday, Wednesday, Friday at 08:00) and a list of topics you approve first. Then ChatGPT writes the posts in one batch and places them on free days, checking your calendar with list_posts.
Mix formats across the month: a tip, a team photo post (you add the photos), a client result, a hiring post. For agencies doing this for several clients, keep one Postika project per client so ChatGPT never puts a post on the wrong account; see Postika for agencies. If you write from your own notes and care most about voice, the Claude LinkedIn guide goes deeper.
What Postika does not do on LinkedIn
Postika does not show LinkedIn analytics, reply to comments, send connection requests or messages. It schedules and publishes posts to the LinkedIn accounts you connect. Plans are priced by channels, not seats (pricing).
Reviewing a month of posts in ten minutes
Once the batch is in your calendar, Postika shows each pending LinkedIn post with a preview, so you can read them in order and catch repetition. If one feels off, ask ChatGPT to rewrite only that one as a new pending post and delete the old one. ChatGPT asks before deleting anything, because delete_post is marked as destructive.
Turn ChatGPT into your social media scheduler
- 1
In Postika, create a project and connect the channels you want ChatGPT to use.
- 2
In ChatGPT, open Settings → Apps & Connectors → Advanced settings and turn on Developer mode.
- 3
Back in Apps & Connectors, click Create. Paste
https://postika.app/api/mcpand choose OAuth as the authentication. - 4
Click Create, then click Allow in the Postika window that opens.
- 5
In a new chat, enable the Postika connector from the composer and ask "Which channels do I have in Postika?" to confirm it works.
Frequently asked questions
Can ChatGPT post on LinkedIn automatically?
Yes, with Postika. ChatGPT can create LinkedIn posts that wait for your approval, or schedule them directly when you ask.
How often should I post on LinkedIn?
There is no rule Postika enforces. Many people aim for two or three posts a week. Pick a rhythm you can review every week, tell ChatGPT the days and times, and it will fill only those slots.
Can ChatGPT add a PDF carousel to LinkedIn?
No. Postika supports text, up to 9 images or one video on LinkedIn, and media is added in the app, not through ChatGPT.
Keep reading
- Schedule LinkedIn posts that go out on timeSchedule LinkedIn posts with text, up to 9 images or a video. Postika checks the 3,000-character limit and can hold posts until you approve them.
- Turn ChatGPT into your social media schedulerConnect ChatGPT to Postika in developer mode and let it write, schedule and list posts on Instagram, LinkedIn, X and 6 more networks, with your approval.
- LinkedIn posts in your voice, written by ClaudeTurn your notes, talks and docs into LinkedIn posts in your own voice with Claude, scheduled in Postika. Text-only works; up to 9 images in the app.
- Reuse your best ideas on Threads with ChatGPTLet ChatGPT shorten your Instagram captions and other posts into Threads posts under 500 characters and schedule them in Postika. Text-only allowed.
- Batch your Pinterest pins with ChatGPTBatch product and recipe pins with ChatGPT: it writes the descriptions and spreads them over weeks in Postika; you attach one image per pin.