chrome extension social media auto poster
Chrome extension social media auto poster: it fills, you publish
Postwire is a browser-based social media auto poster that fills platform editors in your own Chrome profile, waits for your publish click and writes the post URL back, without your logins leaving your Mac.
How the extension works
The Postwire extension runs in a dedicated Chrome profile (we call it 'ops') on your own Mac. It polls the hub for variants, opens the platform's editor, fills the title and body, injects the images and stops at the publish button. After you click publish it captures the post URL and sends it back.
If something goes wrong it reports a structured reason (platform, step, page title, URL) instead of a screenshot, and a heads-up display lets you stop it at any time and take over.
What stays on your machine
Your platform login cookies stay in that local Chrome profile and are never uploaded to the hub. The extension uses its own narrow key that can only reach the assist endpoints.
The trade-offs: no developer app and no API fees, but the extension only works while your Mac is awake and the ops profile is open, every post needs your click, and it never works around a platform's sign-in.
Frequently asked
- Which platforms use the extension?
- All nine: X, Threads, Instagram, Facebook, Dev.to, Medium, Reddit, LinkedIn and Xiaohongshu. None of them is posted through a platform API.
- Does it need my Mac to stay on?
- Yes. Posts are filled only while your Mac is awake and the dedicated Chrome profile is open, and you click publish there.
- Are my passwords sent to Postwire?
- No. Logins and cookies stay in your local Chrome profile; the hub only receives post URLs and status.
Related
Try Postwire
Free tier, no credit card.