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, a Meta-authorised WhatsApp Business Solution Provider, sets up API-based bulk messaging for Indian businesses — pre-approved templates sent to opted-in customer lists with no practical limit on recipients.
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, with no practical upper limit on recipients, 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 customer list at once, with no practical cap on recipients — unlike the WhatsApp Business app's 256-contact broadcast list limit.
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 messages have an open rate of up to 98% — well above typical SMS and email open rates — because customers already check WhatsApp constantly throughout the day.
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.
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.
Bulk messages sent via the WhatsApp Business API are billed by Meta according to the message's template category, plus MetaReach's platform fee — MetaReach charges zero setup fee. 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.
From startups to enterprises — brands that grow with MetaReach
Guides, OTP, transactional, DLT registration & city coverage — everything about bulk SMS in India
Send your first bulk SMS campaign today — ₹0.12/SMS, 99.9% delivery, same-day setup.
