To send bulk WhatsApp messages to hundreds or thousands of customers, businesses use the WhatsApp Business API: one approved template, sent to your whole opted-in list at once, with delivery and read tracking. Bulk messaging on WhatsApp means sending the same message — an offer, order update, or announcement — to a large customer list at once through the WhatsApp Business API, rather than one conversation at a time. This is different from bulk SMS, which delivers plain text over the mobile network instead of through WhatsApp. MetaReach provides WhatsApp Business Platform/API onboarding, integration and campaign workflow support for businesses in India, subject to Meta eligibility, review and applicable policies. Campaigns use approved templates and opted-in recipients, subject to current messaging limits and policies.
Many people search for a "WhatsApp bulk SMS sender" when they want to send one message to a large customer list on WhatsApp. Strictly speaking, WhatsApp messages are not SMS. They travel over the internet inside the WhatsApp app, while SMS travels over the mobile network to any phone. The two are sent through different systems, with different rules and costs.
| Bulk SMS | Bulk WhatsApp messages | |
|---|---|---|
| How it is delivered | Mobile network, to any phone | Internet, inside the WhatsApp app |
| Who can receive it | Any mobile number, subject to DND rules for promotions | Opted-in customers who use WhatsApp |
| Approval needed | DLT-registered sender ID and template | Meta-approved message template |
| Content | Plain text and links | Text, images, PDFs and buttons |
| Sender shown | Registered sender ID (header) | Your business name and profile |
| Replies | Usually one-way | Customers can reply in the same chat |
| MetaReach pricing | ₹0.40 down to ₹0.12 per SMS by volume, plus GST | ₹7,999 for 3 months plus GST, with Meta's per-message charges on top |
Desktop tools and browser extensions that send bulk messages from a normal WhatsApp or WhatsApp Business app account break WhatsApp's terms. Numbers used this way are often restricted or banned, and the messages have no delivery reports or template approval. The safe way to send bulk WhatsApp messages is the official WhatsApp Business API, which is what MetaReach sets up.
Many businesses use both channels: WhatsApp for rich, two-way campaigns to opted-in customers, and bulk SMS to reach every number, including customers who aren't on WhatsApp. For a deeper comparison, see WhatsApp vs bulk SMS.
WhatsApp gives businesses three different ways to reach many customers at once, and they work very differently:
Broadcast Lists (built into the free WhatsApp Business app) let you send one message to up to 256 contacts at a time — but only contacts who already have your number saved receive it, and there's no delivery tracking or template approval involved. It's manual, and it doesn't scale past a few hundred people.
WhatsApp Channels are a one-to-many broadcast tool where customers follow your business to receive updates, similar to a subscription feed, separate from your regular one-to-one chats.
API-based bulk sending is what businesses use for real scale: pre-approved message templates sent programmatically to an opted-in customer list, within WhatsApp's daily messaging limits, which rise as your number builds a good quality record, plus delivery and read tracking. This is what MetaReach sets up and manages for you — see the full WhatsApp Business API overview for how the underlying platform works.
Every bulk send uses a Meta-approved template — marketing, utility, or authentication category — so messages are compliant and don't get flagged as spam.
Send to your full opted-in customer list in one campaign, well beyond the WhatsApp Business app's 256-contact broadcast list limit, within WhatsApp's daily messaging limits.
Track delivery status and read receipts per campaign, so you know exactly how a broadcast performed rather than sending blind.
Include images, PDFs, and buttons in a broadcast template — not just plain text, which is all traditional bulk SMS supports.
Trigger bulk sends from your CRM or e-commerce platform — for example, a list segment built from purchase history or signup date.
Every broadcast is sent from your verified business number, with green tick eligibility — customers see your brand name, not an anonymous number.
WhatsApp is often a strong channel for customer engagement because customers already check it regularly for conversations, service updates, and product information.
A bulk WhatsApp broadcast can include images, product catalogs, PDFs, and reply buttons. Bulk SMS is limited to plain text.
Recipients see your verified business name and, where eligible, a green tick — not an anonymous sender ID.
Unlike a one-way SMS blast, a customer can reply directly to a WhatsApp broadcast, opening a real conversation without a separate channel.
Want help with your first campaign? Book a free demo and we'll walk through the setup with your own list and template.
Meta requires explicit customer opt-in before you send marketing template messages via the WhatsApp Business API — you cannot bulk-message a purchased or scraped number list the way some businesses treat SMS. Every business-initiated bulk message must use a pre-approved template from one of Meta's categories (marketing, utility, or authentication); free-form text is only permitted when a customer has messaged you first, within that open service window. Sending to non-opted-in numbers risks your number being flagged or banned by Meta.
Sending bulk WhatsApp messages has two costs. MetaReach's WhatsApp Business API plan is ₹7,999 for 3 months, plus GST. On top of that, Meta charges per message by template category: marketing messages cost the most, while utility and authentication messages cost much less. See the WhatsApp Business API pricing page for the current rate breakdown, or book a free demo for a quote based on your list size and message mix.
These three things get confused often, so here's the distinction: bulk messaging (this page) is a one-to-many broadcast — the same template sent to many recipients at once. A WhatsApp chatbot is the opposite direction — a two-way, automated conversation that responds to what an individual customer types. For scheduled, triggered, or workflow-based sends (a message that fires automatically when a customer takes an action), see our WhatsApp API automation examples. Bulk messaging, chatbots, and automation are often used together, but they solve different problems.
A WhatsApp bulk message sender that is safe for a business uses the official WhatsApp API for bulk messages, not an unofficial tool running on a phone. With WhatsApp Business bulk messages sent through the API, you send one approved template to your opted-in customers, with delivery and read reports for each one.
Typical WhatsApp Business bulk message campaigns include sale announcements, order and delivery updates, payment reminders and event invitations. Each one uses an approved template, and promotional messages go only to customers who have opted in.
Use the official WhatsApp Business API through a provider. Unofficial bulk sender software that sends from a normal WhatsApp account breaks WhatsApp's terms and can get the number banned.
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Send your first bulk SMS campaign with the right setup and routing for your use case. Contact MetaReach for current commercial terms and onboarding guidance.
