WhatsApp broadcast messages: how to send them right
Published 8 September 2026 · Replio
A restock, a Friday special, a reminder that appointments open at 9am — you want every customer to know at once, and WhatsApp is the channel they actually read. But WhatsApp is not email: send it the wrong way and you risk a flagged number instead of a full inbox. Here is how a WhatsApp broadcast actually works, the rules that keep it legitimate, and how to send one without babysitting a spreadsheet.
What a WhatsApp broadcast actually is
People often mean two different things by "WhatsApp broadcast." The personal app has a Broadcast Lists feature capped at 256 contacts, and it only reaches people who already have your number saved — useful for a small group, useless for a customer base. What businesses actually want is a broadcast on the WhatsApp Business Platform: one message sent to every opted-in customer on your list, delivered as individual one-to-one chats rather than a visible group, with no 256-contact ceiling.
Because it runs through the official Business Platform, a broadcast goes out as an approved message template. You write the wording once, Meta reviews and approves it, and you can reuse that template for every future send. That approval step is exactly what keeps a legitimate broadcast from looking like the spam WhatsApp is built to block.
The rules that actually matter
Three WhatsApp mechanics decide whether a broadcast helps your business or gets your number restricted:
| Rule | What it means for you |
|---|---|
| 24-hour service window | You can send free-form replies to a customer for 24 hours after their last message. Outside that window, only pre-approved templates go through — which is every broadcast, by definition. |
| Opt-in requirement | WhatsApp requires that a customer has messaged your business, or otherwise clearly agreed, before you can send them anything. There is no legitimate way to buy a number list and broadcast to it. |
| Messaging tiers | Meta assigns every business number a daily tier that caps how many new customers you can message in a rolling 24 hours. Send a broadcast faster than your tier allows and Meta throttles or blocks the rest. |
Meta also grades every business number on a quality rating, and repeated complaints or block rates push a number down toward restriction. Templates matter here too: Meta classifies them as Utility (order updates, reminders, account alerts), Authentication (OTPs), or Marketing (promotions). Utility templates tend to protect a number's quality rating better than a steady stream of pure promotion, because customers expect them and rarely block a business for sending one.
How to send one without getting flagged
- Pick or write an approved template. A promotion, a restock alert, an appointment reminder, a company update — whatever the message is, it needs Meta's sign-off first.
- Only message people who have opted in. Anyone who has messaged your business number counts. Never import a cold list.
- Segment if it helps. A restock notice for a product sold only in one country should not go to every contact on the list.
- Send now or schedule it. A scheduled send lets you line a promotion up with a launch time without being at your desk when it fires.
- Pace it to your daily tier. Blasting your entire list in one burst is the fastest way to trip a rate cap; spreading the same send across the tier's window keeps every message delivering.
- Honour every opt-out immediately. A STOP reply should remove that contact from every future broadcast without anyone having to remember to update a list.
Doing all six by hand, on a spreadsheet, for a list that grows every week, is exactly the kind of routine job worth automating rather than repeating.
What Replio handles for you
Replio's WhatsApp broadcast tool builds the rules above into the send itself, rather than leaving them to you to remember:
- Approved templates, managed for you. Choose from your WhatsApp message templates — promotions, restock alerts, reminders — reused for every future send.
- Automatic tier pacing. Replio paces the send within your number's daily messaging tier, so you stay inside Meta's limits without watching a counter yourself.
- Opt-in only, always. A broadcast only reaches contacts who have already messaged your business. Replio never scrapes or imports cold numbers.
- Automatic opt-out. Every broadcast includes a List-Unsubscribe option and honours STOP replies, dropping anyone who opts out from future sends without manual list-scrubbing.
- Send now or schedule. Fire immediately or pick a date and time, with the recipient count and estimated cost shown before you commit.
- One brain, not a separate broadcast bot. The same AI that replies to inbound WhatsApp questions 24/7 also sends your broadcasts, shares the same contact list and knowledge base, and logs the replies a broadcast generates in your shared inbox.
The part broadcast tools rarely mention: a good campaign generates replies — "is this still in stock?", "can I book that slot?" — and every one of those needs an answer. Because Replio's AI agent already knows your business, it can answer the flood of replies a successful broadcast creates instead of leaving your team to work through them one by one.
Good uses for a WhatsApp broadcast
- Restock and new-arrival alerts — tell customers the moment something they wanted is back.
- Appointment and order reminders — Utility templates that cut no-shows and inbound "where is my order" tickets.
- Time-limited promotions — a Friday special or a flash sale that needs to land before it expires.
- Company updates — a holiday closure, a new location, a policy change customers should hear about directly.
- Re-engaging quiet customers — a broadcast to contacts who have not ordered in a while, paired with the AI ready to answer whoever replies.
Pricing
WhatsApp broadcast is included on Replio's full plans: Starter ($49/month), Scale ($149/month) and Pro ($349/month), with Starter covering one channel you pick and Scale and Pro covering every channel including WhatsApp, Instagram and Messenger together. On top of your plan you pay Meta's standard per-conversation template fees directly to Meta — Replio adds no markup, and shows the estimated cost before you send. There is a free 14-day trial of everything, no card required.
Send your first broadcast today
Connect your WhatsApp number, get a template approved, and message every opted-in customer at once — paced, compliant, and answered by the same AI that runs your inbox.
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