Bulk WhatsApp marketing means sending one message to hundreds or thousands of customers at once, such as an offer, a reminder or a new-arrival alert. The only safe way to do it is through the official WhatsApp Business Platform (API) with Meta-approved templates sent to people who agreed to hear from you. Unofficial "bulk sender" software may look cheaper, but it is the fastest way to get your number blocked.
Official API vs unofficial bulk WhatsApp tools
Many Indian businesses start with a Chrome extension or a desktop "bulk WhatsApp sender" that automates the normal WhatsApp app. These tools break WhatsApp's terms of service. WhatsApp detects unusual sending patterns and blocks the number, often with all your chats and customer history on it.
| Official WhatsApp Business API | Unofficial bulk sender tools | |
|---|---|---|
| Allowed by WhatsApp | Yes | No, breaks terms of service |
| Risk of number ban | Low if you follow the rules | High |
| Message format | Pre-approved templates | Anything, typed freely |
| Daily reach | Grows with good quality (250 to unlimited) | Unpredictable until blocked |
| Delivery reports | Sent, delivered, read | Usually guesswork |
| Team inbox and chatbot | Available | Rarely |
| Business name shown | Yes, with display name | Just a phone number |
The official route has rules, but those rules protect you.
The three rules of official bulk WhatsApp marketing
1. Use approved templates
Any message you send to a customer who has not messaged you in the last 24 hours must be a template that Meta has reviewed. Templates can carry variables like the customer's name, an image, and buttons. Approval usually comes within minutes to 24 hours. Our guide to WhatsApp template message approval covers what gets rejected.
2. Only message people who opted in
Meta requires that customers agree to receive WhatsApp messages from your business. A tick box at checkout, a "Send me offers on WhatsApp" form, or a customer messaging you first all count. Keep a note of how each contact opted in. See our WhatsApp opt-in best practices.
3. Respect your messaging limit and quality rating
As of November 2026, a new business portfolio can message 250 unique customers in a rolling 24 hours outside an open chat. Verifying your business (or sending enough high-quality messages) unlocks 2,000, and the limit then scales automatically to 10,000, 100,000 and unlimited when your quality stays good and you use at least half your current limit. Meta can change these tiers, so check WhatsApp Manager for your current limit.
How much does bulk WhatsApp marketing cost?
Since 1 July 2025, Meta charges per delivered template message. The price depends on the category (marketing, utility or authentication) and the customer's country code. Marketing messages cost the most; utility messages such as order updates cost less. Meta updates rates at the start of a quarter, so always check the live rate. Our post on WhatsApp Business API pricing in India explains it in detail.
On AiSender you pay from a prepaid wallet with no monthly fee, the total cost is shown before you hit send, and failed messages are refunded to your wallet.
Step-by-step: set up your first bulk WhatsApp campaign
- Connect your number. Use a number that is not active on the regular WhatsApp app. On AiSender you connect it with Continue with Facebook in about 10 minutes.
- Create a template. Write a short, clear message with variables such as {{1}} for the name. Add an image and a button if it helps.
- Wait for approval. Check the category Meta assigns. Offers and discounts will always be marketing.
- Prepare your list. Upload an Excel or CSV file, or pick saved contacts. Include columns for each variable, like name, city or last product bought.
- Map variables. Match {{1}} to the name column, {{2}} to the offer code, and so on. Preview a few rows to check nothing looks odd.
- Check cost and limit. Make sure the list size fits within your daily messaging limit and wallet balance.
- Send or schedule. Send now, or schedule up to 15 days ahead on AiSender.
- Handle replies. Have someone ready in the shared inbox. Replies are where sales happen.
A simple, approvable marketing template looks like this:
Hi {{1}}, Diwali sale is live at {{2}}! Get flat 20% off on all kurtas till Sunday. Use code {{3}} at billing. Reply STOP to stop offers.
Segmentation: send fewer, better messages
Sending the same offer to everyone is the quickest way to get blocked or reported. Split your list into small groups that care about different things:
- By purchase history: past buyers of a product category get related offers.
- By location: a store opening in Indore should only go to Indore customers.
- By activity: customers who bought in the last 90 days vs those who have gone quiet.
- By stage: new enquiries, active students, past patients, repeat customers.
Timing and frequency
There is no magic hour that works for every business, so test. Some practical starting points for Indian audiences:
- Avoid very early mornings and late nights. People report messages that wake them up.
- Retail and fashion offers tend to suit late morning or evening, when people browse.
- Coaching institutes often reach parents best in the evening after work.
- Send festive offers a few days before the festival, not on the day itself.
- Keep marketing messages to a sensible frequency, such as once or twice a week at most for most businesses.
Meta also limits how many marketing messages one person receives from businesses overall, so some messages to very active WhatsApp users may not be delivered. Fewer, more relevant messages help here too.
Measuring results
Every campaign should answer one question: did it bring business? Track these numbers:
| Metric | What it tells you | What to do if low |
|---|---|---|
| Delivered rate | Valid, reachable numbers | Clean your list, remove wrong numbers |
| Read rate | Message preview is interesting | Improve the first line and image |
| Reply rate | People want to talk | Add a clear question or button |
| STOP / block rate | Message was unwanted | Tighten your segment, send less often |
| Sales or bookings | Real business result | Track with a unique coupon code per campaign |
AiSender shows sent, delivered and read reports for each campaign.
Protect your quality rating
Your quality rating drops when customers block or report you. When it falls, your limit can stop growing or your templates can be paused. To stay safe:
- Always include an easy way to stop, such as "Reply STOP". AiSender skips customers who replied STOP automatically.
- Remove numbers that never read your messages.
- Never buy or scrape number lists.
If things have already gone wrong, read about WhatsApp quality rating and blocked numbers.
FAQ
Is bulk WhatsApp marketing legal in India?
Yes, when you use the official WhatsApp Business API, send approved templates and only message customers who have opted in. Using unofficial automation tools breaks WhatsApp's terms and can get your number banned.
How many bulk WhatsApp messages can I send per day?
It depends on your messaging limit. As of November 2026, new portfolios start at 250 unique customers per 24 hours, rising to 2,000 after business verification and then higher with good quality. Meta can change these tiers.
Can I send bulk WhatsApp messages from the WhatsApp Business app?
The app's broadcast lists only reach people who have saved your number and are limited in size. For larger campaigns with reports and scheduling, you need the API.
Why did my bulk messages fail to deliver?
Common reasons are invalid numbers, hitting your messaging limit, a paused template, or Meta's per-user marketing limits.
Ready to run your first campaign the safe way? Try AiSender to upload your list, personalise your template, see the cost upfront and track every delivery and read.
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