Schedule WhatsApp broadcasts. The channel people actually read.
WhatsApp gets opened. That makes it the most valuable and the most dangerous channel you own — valuable because a message is nearly always read, dangerous because there is no algorithm to hide an over-send from your audience. Scheduling it deliberately, on a cadence, is the point.
On your calendar with everything else.
No algorithm to hide behind
On a feed platform, posting too often is mostly self-correcting. Reach drops, engagement dips, and the audience never really notices you overdid it.
WhatsApp has no such buffer. Every message is a notification on someone's phone. Send too many and the feedback is immediate and permanent — people leave, and they do not come back.
That asymmetry is the whole reason to schedule this channel rather than post to it impulsively. A calendar makes cadence visible. Sending by hand whenever there is news is exactly how the over-send happens.
Write for an interruption
The bar is different. A social post competes for attention among things someone chose to browse. A WhatsApp message interrupts.
So the useful question before scheduling one is whether it justifies a notification. If the answer is "not really, but it is nice", it belongs on a feed instead — or in a Telegram or Discord channel, where community audiences opt into detail.
One media item per message, per the table above. Keep the asset doing one job.
On the same calendar, deliberately
The reason to have WhatsApp in Postonus is not convenience for its own sake. It is that seeing your WhatsApp sends next to your social posts is what stops the channel from being either neglected or overused — the two failure modes it actually has.
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Limits
What WhatsApp allows in one post. The composer enforces these while you type.
- Characters per post
- 4,096
- Media per post
- 1
- Media types
- image, video
- First comment
- Not supported by the platform
Read from the same rules the composer and the publish workers use, so this table cannot drift from what actually publishes.
Questions
Frequently asked questions Everything the first evaluation usually needs.
- Can I schedule WhatsApp messages?
Yes, to a connected WhatsApp destination, from the same calendar as your other channels. The message publishes at the scheduled time.
- How long can a message be?
See the table above, generated from the rules the publisher enforces. The allowance is generous compared with the feed platforms.
- How often should I send?
Less often than you post on social. There is no feed ranking to soften an over-send here — every message arrives as a notification, and the cost of annoying people is unsubscribes rather than a quiet dip in reach.
- How many media items can a message carry?
One. The table above is the authoritative source, since it reflects what the publisher accepts.
- Should the copy match my social posts?
No. A message that arrives as a notification should read like it was worth interrupting someone for, which is a different bar from a post someone chose to scroll past.
Keep reading
- Telegram schedulerSchedule Telegram channel posts with a bot token, and see the caption limit change when you attach media — 4,096 for a message, 1,024 with an image.Read
- Discord schedulerSchedule announcements to a Discord channel from the same calendar as your public social posts, so a community update is not a manual task at a fixed hour.Read
- Multi-platform publishingWrite once and publish to 16 platforms, with per-channel overrides where the platforms differ. Limits are enforced as you type, from the rules workers use.Read