How to send WhatsApp bulk messages without getting your number blocked

The safe way to send WhatsApp bulk messages is through the official WhatsApp Business Platform (the API), using message templates Meta has approved and sending only to people who agreed to hear from you. Unofficial "bulk sender" tools and browser extensions break WhatsApp's terms and are the most common reason business numbers get banned.

On the API there's no fixed list size. How many people you can message per day depends on your messaging limit, which starts at 250 unique people per 24 hours and grows as you send good-quality messages.

Why do WhatsApp numbers get blocked for bulk messaging?

Numbers get restricted when WhatsApp sees spam-like behaviour: messages to people who don't know you, lots of blocks and reports, or automation through unofficial tools. Meta monitors your quality rating, which is based on how people react to your messages. It can limit your sending when quality stays low (Meta opt-in guidance).

The fix isn't a trick. It's sending wanted messages, through the official channel, to people who opted in.

WhatsApp Business app broadcasts vs the API

The free WhatsApp Business app has broadcast lists, but they're small and limited:

	WhatsApp Business app broadcast	WhatsApp Business Platform (API)
Recipients per send	Up to 256 per list (WhatsApp Help)	Up to your messaging limit (250 → 2,000 → 10,000 → 100,000 → unlimited per day)
Who receives it	Only people who saved your number	Anyone who opted in, even if they haven't saved your number
Message format	Any text	Approved templates for business-initiated messages
Cost	Free	Meta charges per delivered template
Scheduling, segments, reports	No	Yes, with a campaign tool
Team access	One phone plus linked devices	Many agents

The app is fine for a small shop messaging a few hundred loyal customers. Once your list grows, or you need personalisation and results tracking, the API is the right tool. Our WhatsApp Business app vs API guide goes deeper.

How WhatsApp messaging limits work

A messaging limit is the number of unique people you can start conversations with, using templates, in a rolling 24 hours. According to Meta's documentation:

• New business portfolios start at 250 unique people per 24 hours.
• You can reach 2,000 by verifying your business, or by sending 2,000 delivered template messages to unique people outside customer service windows within 30 days with high-quality templates.
• After that, limits rise automatically to 10,000, 100,000 and then unlimited. You need good quality and to have used at least half your current limit in the last 7 days. Increases happen within about 6 hours.
• Limits are shared across your business portfolio. Adding another phone number doesn't add another allowance. All your numbers share one pool.

Replies to customers who messaged you first don't count toward this limit.

What do WhatsApp bulk messages cost?

Promotional broadcasts use marketing templates. Meta charges per delivered message, at a rate set by the recipient's country (Meta pricing). Marketing is usually the most expensive category, so it's worth sending to the right people rather than everyone.

Worked example (hypothetical). A clothing store sends a festive sale message to 5,000 opted-in customers in one country. That's 5,000 marketing templates. Multiply by that country's marketing rate on Meta's rate card to get the Meta cost, before any platform subscription.

Two ways to spend less:

• Segment. Send the sale on kidswear to parents who bought kidswear, not your whole list.
• Use Click-to-WhatsApp ads for new customers. Conversations started from these ads open a 72-hour window in which your messages are free (Meta pricing).

For all the billing details, including the 1 October 2026 change to service messages, see our WhatsApp API pricing guide.

How to send WhatsApp bulk messages, step by step

1. Get on the API. Connect your business number to the WhatsApp Business Platform through a provider.
2. Collect opt-in. Use a website checkbox, a checkout option, a form, or a "Reply YES to get offers" message. Meta requires the opt-in to say clearly that people will get messages from your business, and to name it (Meta opt-in guidance).
3. Import and tag contacts. Upload your list and mark who opted in. Tag people by interest, location or purchase history.
4. Create a template. Write it, choose the Marketing category and submit it for approval. Our guide to getting templates approved helps you avoid rejections.
5. Build the audience. Pick a segment or tag and preview who will receive it.
6. Send a test to your own number and check links, images and variables.
7. Schedule it for a time your customers are awake and not working, often early evening.
8. Watch the results: delivered, read, failed and replies. Answer the replies quickly, because that's where the sales happen.

Omni's campaigns follow these steps. You pick a segment, tag, selected contacts or CSV as the audience, preview it, send a test and send now or schedule. Contacts who haven't opted in are skipped automatically.

Messages are sent at a steady pace rather than all at once, and you can pause a campaign and relaunch it without re-sending to people who already got it.

Each recipient's status is tracked, and replies come into your team inbox. The same campaign tool can also send SMS through your own SMS provider, or email through your own SMTP server.

How to keep your quality rating high

• Only message people who opted in. This matters more than anything else.
• Make it relevant. Segment by interest and purchase history.
• Don't send too often. For most businesses, one or two marketing messages a week at most. Many do fewer.
• Offer an easy way out. Add a "Stop promotions" quick-reply button, and honour it.
• Make it personal. Use the customer's name and something relevant to them.
• Start slowly with a new number. Send to your most engaged customers first, then grow.
• Watch your blocks. If a campaign gets unusually many blocks, stop and rethink before the next one.

Common mistakes to avoid

• Using unofficial bulk-sender tools or WhatsApp Web extensions. They put your number at risk of a ban.
• Buying contact lists. Those people never agreed to hear from you, so expect blocks and reports.
• Sending the same blast to everyone. It costs more and annoys people it doesn't fit.
• Ignoring replies. A broadcast is the start of conversations, not the end of the job.

Sources

• Meta for Developers: Messaging limits
• Meta for Developers: Pricing on the WhatsApp Business Platform
• Meta for Developers: Get opt-in for WhatsApp
• WhatsApp Help Center: How to use broadcast lists on the WhatsApp Business app