Connect Custom webhook
Send any post as JSON to your own endpoint. Plan it in the same calendar as every other channel, with AI captions sized to fit.
7-day free trial on every plan. Cancel anytime.
What you can publish to Custom webhook
Every format is previewed before it goes out, so what you see is what your audience gets.
JSON payload
Posts that always fit Webhook
Each network has its own rules. PostRocket knows them, sizes AI captions to match and warns you before a post would be rejected.
Webhook limits
- Caption length
- 100,000 characters
- Media per post
- Up to 35 files
- Media required
- No, text-only works
The composer checks these as you type and flags anything that won't fit before you schedule.
Up and running with Custom webhook
Create your free account
Start a 7-day trial and set up your first brand.
Choose Custom webhook under Channels
Follow the prompts to authorise PostRocket, then pick the Custom webhook accounts you want to post to.
Write, schedule, done
Draft with AI or by hand, preview it, and pick a time. PostRocket publishes for you.
Also connects with
Run every channel from the same calendar, inbox and brand settings.
Put Custom webhook on autopilot
7-day free trial on every plan. Cancel anytime.