How to Send Bulk SMS Through WhatsApp Using WhatsApp Business API (Step-by-Step Guide for 2025)

In today’s fast-paced digital landscape, businesses are constantly seeking more efficient ways to communicate with customers. Traditional SMS marketing, while still effective, has evolved into something far more dynamic — WhatsApp bulk messaging.

With over two billion users and open rates exceeding 95%, WhatsApp has become one of the most powerful platforms for business communication. Whether you are a small enterprise or a large organization, learning how to send bulk SMS through WhatsApp can help you reach your audience faster, increase engagement, and improve conversion rates.

This guide will walk you through everything you need to know about how to send bulk SMS through WhatsApp Business, including the use of the WhatsApp Marketing API, compliance tips, and how platforms like Mtalkz make the process simple and effective.

What is WhatsApp Bulk Messaging?

WhatsApp bulk messaging refers to the process of sending messages to multiple recipients simultaneously through WhatsApp. Unlike traditional SMS campaigns, WhatsApp messages allow businesses to send not just text but also multimedia content such as images, PDFs, videos, and catalogs.

Bulk messaging via WhatsApp is ideal for promotions, customer updates, transactional alerts, or support messages. Businesses can leverage this channel to deliver personalized and interactive experiences that SMS simply cannot match.

Can You Send Bulk SMS Through WhatsApp Directly?

While WhatsApp allows sending messages to multiple contacts, the regular WhatsApp app and even the WhatsApp Business app have limitations.

The standard app restricts you to 256 contacts per broadcast list and discourages unsolicited bulk messaging. If you attempt to send large volumes of messages using a regular account, your number can be flagged or even banned.

To scale communication safely and effectively, businesses must use the WhatsApp Business API — an official solution developed by Meta that allows approved service providers such as Mtalkz to facilitate large-scale, compliant WhatsApp campaigns.

How to Send Bulk SMS Through WhatsApp Business (Step-by-Step Guide)

Step 1: Get WhatsApp Business API Access

The first step in sending bulk SMS through WhatsApp is to obtain access to the WhatsApp Business API. Unlike the free WhatsApp Business app, the API is designed for enterprises and supports automation, integration, and scalability.

To get access, you need to:

• Partner with an official WhatsApp Business Solution Provider (BSP) such as Mtalkz.
   
• Verify your Meta Business account.
   
• Set up your WhatsApp Business profile, privacy policy, and approved templates.
  
   

Mtalkz provides a seamless onboarding process for WhatsApp API, ensuring that your setup meets Meta’s compliance standards.

Step 2: Create Pre-Approved Message Templates

WhatsApp requires all bulk messages to use pre-approved templates. These templates ensure that your communication is compliant and non-spammy. You can personalize them by adding dynamic fields such as the recipient’s name, order number, or custom offers.

Example:

“Hello {name}, your order #{order_id} has been shipped! Track it here: {link}.”

With Mtalkz, you can easily create, submit, and manage templates through their WhatsApp API dashboard.

Step 3: Segment Your Audience

Audience segmentation is critical for campaign success. Sending every message to everyone reduces relevance and increases opt-outs.

Segment your audience based on:

• Demographics (age, region, or language)
   
• Purchase history
   
• User engagement or preferences
  
   

This ensures your WhatsApp marketing API campaigns are highly targeted and effective.

Step 4: Launch Your Bulk Campaign

Once your templates and contact lists are ready, you can launch your campaign directly through the Mtalkz platform.

Schedule your campaigns based on user activity, time zones, or events. You can send thousands of messages instantly with guaranteed delivery rates and full visibility through analytics.

Step 5: Monitor and Optimize Results

After sending your bulk WhatsApp campaign, monitor performance through Mtalkz’s analytics dashboard. Track key metrics such as:

• Delivery and read rates
   
• Engagement (responses or clicks)
   
• Message performance trends
  
   

Use this data to refine your next campaigns for higher efficiency and better ROI.

Benefits of Using WhatsApp Marketing API

Using the WhatsApp Marketing API provides numerous advantages over traditional SMS campaigns.

1. High Engagement Rates: WhatsApp messages boast a 98% open rate compared to 30–40% for SMS.
    
2. Rich Media Support: Send images, PDFs, product catalogs, and videos to make messages more engaging.
    
3. Two-Way Communication: Allow customers to reply instantly, enhancing customer experience.
    
4. Automation at Scale: Automate broadcasts, responses, and workflows with CRM integrations.
    
5. Data Security and Compliance: The WhatsApp API ensures that all messages adhere to Meta’s privacy policies.
    
6. Comprehensive Analytics: Track every aspect of your communication to make data-driven decisions.
   
    

How WhatsApp API Outperforms Regular Bulk SMS

As the table shows, the WhatsApp Business API offers a more flexible and impactful solution than conventional bulk SMS.

Best Practices to Avoid Getting Banned

To ensure that your WhatsApp bulk messaging remains effective and compliant, follow these best practices:

• Get User Consent (Opt-In): Only message users who have agreed to receive WhatsApp communication.
  
   
• Use Approved Templates: Always send messages using WhatsApp-approved formats.
  
   
• Avoid Spamming: Maintain frequency balance to prevent being flagged.
  
   
• Personalize Content: Use customer-specific data to make messages relevant.
  
   
• Partner with an Official BSP: Work with authorized providers like Mtalkz to stay compliant.

Real-World Examples of WhatsApp Bulk Messaging

The versatility of WhatsApp bulk messaging makes it an indispensable tool across industries. From customer engagement and lead nurturing to transactional alerts and support automation, businesses are using the WhatsApp Business API to improve efficiency, satisfaction, and conversion rates.

Here are a few detailed examples of how different sectors are leveraging WhatsApp for large-scale communication:

1. E-commerce and Retail

E-commerce platforms use WhatsApp bulk messaging to provide personalized updates throughout the customer journey. Instead of relying on emails that may go unread, retailers send real-time WhatsApp messages such as:

• Order confirmations and payment receipts
   
• Shipping and delivery notifications
   
• Back-in-stock or price-drop alerts
   
• Personalized product recommendations based on previous purchases
  
   

For instance, an online fashion brand can automatically notify a customer when their preferred item is back in stock. By integrating the WhatsApp Marketing API with their CRM, they can send dynamic messages including the customer’s name, product image, and a direct purchase link. This approach consistently leads to higher engagement and repeat purchases.

2. Financial Services and Fintech

Banks and fintech companies have adopted WhatsApp Business API for secure, instant communication. Instead of sending SMS updates, they now deliver:

• Transaction alerts and balance updates
   
• Loan or EMI reminders
   
• OTPs for secure login or payment verification
   
• Fraud alerts and security notifications
  
   

For example, a digital lending platform can use WhatsApp to remind customers about upcoming payments or to share pre-approved loan offers. This not only enhances convenience but also builds trust, as customers receive critical information on a familiar and encrypted platform.

3. Healthcare and Wellness

Hospitals, clinics, and diagnostic centers are increasingly using WhatsApp to improve patient communication. By automating bulk notifications, healthcare providers can send:

• Appointment reminders and confirmations
   
• Prescription refill alerts
   
• Lab report updates and wellness tips
  
   

Imagine a clinic sending automated reminders to all patients scheduled for appointments the next day, along with a Google Maps link to the location. Such proactive communication reduces no-shows and improves patient satisfaction.

4. Education and Training Institutions

Educational institutions use WhatsApp bulk messaging to connect with students, parents, and staff effectively. Schools and universities can broadcast:

• Exam schedules and results
   
• Event or seminar updates
   
• Admission notifications
   
• Fee payment reminders
  
   

Training centers and edtech startups leverage WhatsApp campaigns for onboarding, course updates, and certification announcements. Compared to traditional email, WhatsApp messages receive instant attention, leading to better engagement and retention.

5. Travel and Hospitality

The travel industry relies heavily on instant communication. Travel agencies, airlines, and hotels use WhatsApp bulk messaging to enhance the guest experience through:

• Booking confirmations and itinerary updates
   
• Real-time flight or trip alerts
   
• Hotel check-in instructions and offers
   
• Post-trip feedback requests
  
   

For example, a travel agency can automate updates for thousands of customers simultaneously using WhatsApp Marketing API, ensuring travelers receive timely information without manual follow-up.

6. Customer Support and Service-Based Businesses

Service-oriented companies such as logistics, telecom, and utilities benefit immensely from WhatsApp automation. With bulk messaging, they can share:

• Service updates or outages
   
• Maintenance alerts
   
• Payment confirmations or renewal reminders
  
   

A logistics firm, for instance, can send real-time parcel tracking updates to thousands of customers at once, creating transparency and reducing support queries.

Why Choose Mtalkz for WhatsApp Bulk Messaging

Mtalkz is one of India’s leading cloud communication platforms and an official provider of the WhatsApp Business API. Here’s why businesses trust Mtalkz for their communication needs:

• Verified Meta BSP with industry-leading delivery rates.
   
• 99.9% uptime with enterprise-grade data security.
   
• Tailor-made API solutions for startups, enterprises, and developers.
   
• 24/7 expert customer support.
   
• Proven record of improving delivery rates by 30% and reducing costs by 20%.
  
   

With Mtalkz, you can manage your entire WhatsApp marketing API campaign from one dashboard — from template creation to analytics and optimization.

Conclusion

Learning how to send bulk SMS through WhatsApp is essential for businesses that want to build stronger connections, boost engagement, and streamline communication. With the WhatsApp Business API, you can send personalized, multimedia-rich messages to thousands of customers instantly and securely.

If you are ready to take your communication to the next level, Mtalkz offers everything you need — from API access and compliance support to real-time analytics and automation.

Start your WhatsApp bulk messaging journey today. Book a free demo with Mtalkz and discover how to connect, engage, and grow your business with ease.

Frequently Asked Questions

1. Can I send 1000 WhatsApp messages at once?
Yes, but only through the WhatsApp Business API. The regular app limits broadcast lists to 256 contacts.

2. How much does it cost to send bulk WhatsApp messages?
Pricing depends on message type, region, and volume. Mtalkz offers transparent, scalable pricing based on your campaign size.

3. Is using WhatsApp API legal?
Yes. Using the WhatsApp Business API through an approved provider like Mtalkz ensures full compliance with Meta’s policies.

4. Can I integrate WhatsApp API with my CRM or ERP?
Yes. Mtalkz’s API easily integrates with CRM, ERP, and eCommerce systems for seamless automation.

5. What is the difference between WhatsApp Business App and API?
The app is suitable for small businesses with limited communication needs, while the API supports automation, large-scale campaigns, and integration with enterprise systems.