Every creator hits this wall. You have 800 buyers, a new course to launch, and one WhatsApp number. Sending 800 messages by hand would take all day, and the bulk sender app your friend recommended might get your number banned by evening.
This guide shows you how to send bulk WhatsApp messages to customers in 2026 without putting your number at risk. We compare the four ways people do it, explain why some of them get numbers banned, and walk through the safe method step by step.
The 4 ways to send bulk WhatsApp messages
| Method | How many people | Unsaved numbers? | Ban risk | Cost |
|---|---|---|---|---|
| Broadcast lists (app) | 256 per list; up to 35 free broadcasts a month where the new cap applies | No, they must save your number | Low if used gently | Free |
| WhatsApp groups | Up to 1,024 members per group | Yes, once added | Medium; everyone sees everyone's number | Free |
| Unofficial bulk sender apps and extensions | As many as you load | Yes | High | Usually a fee to the tool |
| Official WhatsApp Business API | 250 people a day to start, growing to unlimited | Yes, if they opted in | Lowest | Meta charges per delivered message |
1. Broadcast lists in the WhatsApp app
Broadcast lists are built into WhatsApp and the WhatsApp Business app. Each person gets your message as a private chat from you.
Where it's genuinely good: a small, loyal audience who all saved your number. It's free and it feels personal.
Where it breaks: WhatsApp's help center says each list holds up to 256 contacts, and only people who saved your number receive the message. In some countries WhatsApp has also introduced a cap of 35 free broadcasts a month. Our WhatsApp broadcast limit guide covers all three limits.
2. WhatsApp groups
Groups can hold up to 1,024 members. You post once and everyone sees it.
Where it's genuinely good: a cohort or class where people should talk to each other.
Where it breaks: every member can see every other member's phone number, people mute busy groups, and your announcement gets buried under 300 "Thank you ma" replies. It's also not private: a buyer asking about a refund does it in front of everyone.
3. Unofficial bulk sender apps and Chrome extensions
Search "WhatsApp bulk sender" and you'll find dozens of apps and browser extensions that load a spreadsheet of numbers and fire off messages through WhatsApp Web, often promising to send "without saving number".
They work, until they don't. Here's why numbers get banned:
- It breaks WhatsApp's rules. WhatsApp's Terms of Service say you must not use the service for "bulk messaging, auto-messaging, auto-dialing, and the like", or through unauthorized automated means.
- The pattern is easy to spot. Hundreds of near-identical messages, sent in minutes, to people who've never chatted with you, is exactly what spam detection looks for.
- People report you. Cold messages from an unknown number get blocked and reported, and those reports count against the number.
- A ban is usually final. If your main number is banned, you lose the chats, the customers who only knew you by that number, and often months of goodwill.
If WhatsApp is how you earn a living, this is the one method to avoid.
4. The official WhatsApp Business API
This is Meta's approved way for businesses to message customers at scale. You connect a dedicated business number through a tool, send pre-approved templates to people who opted in, and Meta charges per delivered message.
Why it's safer: it's built for this. There's no 256 cap, no monthly broadcast cap, and people don't need to save your number. Meta sets a daily limit on how many unique people you can start conversations with (250 to start, rising to 2,000, 10,000, 100,000 and unlimited as you prove good quality).
The trade-offs: you need a separate number, your messages to start a chat must use approved templates, and each delivered message costs money. For Nigerian numbers in November 2026, Meta's marketing rate is $0.0516 per message (about ₦70). Our WhatsApp Business API pricing guide for Nigeria breaks down every category.
How to send bulk WhatsApp messages without saving number
This is one of the most searched questions, and the honest answer is short.
- Broadcast lists can't do it. Unsaved contacts simply don't receive them.
- Bulk sender apps can, but that's what gets numbers banned.
- The official API can, safely, as long as the person gave you their number and agreed to hear from you. Saving your number doesn't matter.
- The WhatsApp Business app's paid "business broadcasts" can also reach unsaved customers, but WhatsApp says the feature is only available in some countries so far.
Step by step: send bulk WhatsApp messages with Serlzo broadcasts
Here's the safe way, using Serlzo's WhatsApp broadcasts on the official API.
Step 1: Connect the official WhatsApp Business API
Get a dedicated number that isn't on any WhatsApp account (a new SIM, or a VoIP number from Twilio or Termii). In Serlzo, go to Integrations and connect the WhatsApp Business API. Serlzo uses Meta's Embedded Signup, so there's no code, and verification takes about 2 to 5 minutes.
Step 2: Create and submit a template
Messages that start a conversation must use a template Meta has approved. Write your message, choose its category (Marketing for a launch or offer, Utility for things like access links and receipts, Authentication for login codes), and submit it.
Meta's review can take up to 24 hours, so create launch templates a few days before you need them.
Step 3: Choose your audience
Pick who gets the broadcast:
- A CRM list, like "Webinar signups" or "Ebook leads", built from your forms and checkouts.
- Your product customers, for example everyone who bought your first course.
- Your community members, to announce a live session or a new module.
Since every buyer and community member is saved to your CRM automatically, your audiences build themselves as you sell.
Step 4: Send a test to yourself
Always send a test first. Check the wording, the link, and how it looks on a phone before 1,000 people see it.
Step 5: Send now or schedule it
Send immediately, or schedule it for a specific date, time and timezone. A Saturday morning send usually beats a 2am send.
Step 6: Track delivery and read stats
After it goes out, Serlzo shows how many messages were sent, delivered, read and failed. A high failed count is a sign your list has old or wrong numbers, so clean it before the next send.
Replies come into your WhatsApp inbox, where Serlzo's AI chatbot can draft a response for you to send or dismiss. To follow up automatically with people who didn't reply, see our WhatsApp automation guide.
WhatsApp Marketing is included on Serlzo's paid plans, from $13 (about ₦17,500) a month. Meta's per-message fees are separate.
What about Serlzo's personal-number connection?
Serlzo can also connect the number you already use, by QR code or pair code. It lets you send free-form messages and post scheduled lessons into WhatsApp groups.
Be honest with yourself about the risk. It isn't Meta's official API, so the number can be banned if WhatsApp flags your activity, and nobody, including Serlzo, can recover a banned number. Use it for small volumes and real conversations, not for bulk sends to big lists. It also isn't available on the Free plan.
Safety checklist: how to send bulk WhatsApp messages without getting blocked
Whatever tool you use, these habits protect your number:
- Only message people who opted in. Meta's rules require opt-in before you message someone, and the opt-in must name your business. A form, a checkout, or a keyword someone texted you all work. Never upload a bought or scraped list.
- Use approved templates to start conversations. On the API, free-form messages are only allowed within 24 hours of the customer's last message.
- Pick the right category. Don't dress up a promotion as a utility message. Meta categorizes templates and can recategorize them.
- Don't overdo it. Meta lists "avoid sending too many messages per day" in its own quality guidelines. One strong launch message beats five reminders.
- Watch your quality rating. Meta rates your messages based on the last seven days of blocks, reports, mutes and archives, and gives each template a green, yellow or red rating. Low quality stops your limit from growing, and repeatedly reported templates can be paused.
- Make it easy to opt out, and honor it. Tell people how to stop your messages. Someone who leaves quietly is better than someone who reports you.
- Make every message worth opening. Personal, useful and short. Meta advises against open-ended "Hi, how are you?" introductions.
- Keep the personal number personal. Bulk sends belong on the official API.
Frequently asked questions
How do I send bulk WhatsApp messages for free?
Broadcast lists in the WhatsApp Business app are free, but each list holds 256 contacts, only people who saved your number receive them, and some countries now have a cap of 35 free broadcasts a month. For larger lists, the official API is paid per delivered message.
How do I send bulk WhatsApp messages without saving the number?
Use the official WhatsApp Business API, which delivers to anyone who opted in, whether or not they saved your number. Broadcast lists can't do this. Bulk sender apps can, but they break WhatsApp's terms and risk getting your number banned.
How do I send bulk WhatsApp messages without getting blocked?
Message only people who opted in, use approved templates on the official API, keep your sending frequency reasonable, and give people an easy way to opt out. Watch your quality rating and fix any template that starts getting negative feedback.
Are WhatsApp bulk sender apps safe?
Unofficial bulk sender apps and extensions automate WhatsApp in ways its Terms of Service prohibit, so they put your number at real risk of a ban. If WhatsApp is a serious sales channel, use the official WhatsApp Business API instead.
How do I send bulk WhatsApp messages to customers from Excel?
On the official API, bring your opted-in customers into a CRM list (Serlzo's CRM lets you bring over contacts you already have), then send an approved template broadcast to that list. In Serlzo, buyers and community members are added to your CRM automatically, so you often don't need a spreadsheet at all.
Send your next launch the safe way
Your WhatsApp number is one of your most valuable business assets. Don't trade it for one fast blast from a bulk sender app.
Connect the official API in Serlzo, build a template, and send your first broadcast to the customers who asked to hear from you.
Last updated November 2026. Serlzo publishes this blog. Prices and policies from other companies change; check their official pages before deciding.