Automate Pinterest with ChatGPT
Pinterest is the only platform here shaped for a tall 2:3 image, and the only one that will take a 32 MB one.
https://api.antwork.io/mcpChatGPT reaches Antwork through a custom app in Developer mode. It is the longest setup of any client here, and the only one where you build the connector yourself rather than pasting a single line.
Custom connectors are a paid ChatGPT feature, and Developer mode has to be switched on first.
Connect it
What you can say once Pinterest is connected
What is different about Pinterest
Two by three
The pin ratio is 2:3 — taller than Instagram’s 4:5 and unlike anything else Antwork posts to. A square crop will publish, but it will not look like a pin next to the ones around it.
Thirty two megabytes for one image
The largest single image any platform here accepts, four times what Instagram allows. A detailed chart or infographic survives the upload without being flattened.
One pin is one thing
A pin holds one image or one video, never a set. Hand the agent a batch and it makes separate pins rather than building a carousel Pinterest will not take.
The description is read by search, not by scrollers
Eight hundred characters, and Pinterest indexes them. The agent writes the description to be found later rather than to be read in the moment, which is the opposite of how it writes everywhere else.
Pinterest limits, as the server enforces them
Posts are capped at 800 characters, and the cap is enforced when you schedule or publish, not silently truncated.
- Max size
- 32 MB
- Per post
- 1
- Ceiling
- up to 1000x1500 · 2:3
- Max size
- 2 GB
- Per post
- 1
- Ceiling
- up to 1080x1920 · 15 min max · 9:16
- — 1 media items per post, in total.
- — Images and video can never share a post. Ask for both and it has to be split into two.
These numbers are read at build time from the same rules file the publishers validate against, so this page cannot claim a limit the server does not enforce.
Questions
- Do I need an API key to connect ChatGPT?
- No. Antwork connects over OAuth — you approve a consent screen in the browser and you are done. There is no key to generate or paste into a URL, which is how most social MCP servers handle it.
- Do I need a paid account?
- No. The free tier covers one workspace, two connected accounts and 20 posts per cycle, and there is no plan gate on MCP access.
- Will ChatGPT post without showing me first?
- Not unless you ask it to. Drafting and publishing are two separate steps: the agent writes, renders the post card, and only publishes when you confirm.
- Does the writing sound like AI?
- Antwork learns a voice profile per connected account by reading what you have already published there, and the agent drafts from that profile. On Pinterest that includes writing to the length the format rewards, up to 800 characters.
Never leave ChatGPT to post again.
One command, one consent screen, and Pinterest is something you can just ask for.