How to send bulk WhatsApp messages (official guide)
Sending bulk WhatsApp messages used to mean risky Chrome extensions and burner numbers. Today, the official WhatsApp Business API lets you send to unlimited opted-in contacts with full delivery receipts, segmentation, and zero risk of bans — if you follow the right steps.
This guide walks you through sending your first compliant bulk WhatsApp message in under 30 minutes.
Step 1 — Get WhatsApp Business API access
Sign up with a Business Solution Provider (BSP) like LandinChat. Connect a phone number not currently on the regular WhatsApp app. Complete Meta business verification (1–3 business days). Set your display name. Now your number can send via the API.
Step 2 — Upload your opted-in contact list
Export your contacts as CSV with columns: phone (E.164 format e.g. +919876543210), name, and any segmentation fields (city, last_purchase, tag). Upload via the BSP dashboard. The system de-duplicates and validates numbers. Only include contacts who opted in to WhatsApp updates.
Step 3 — Create and approve a marketing template
In your BSP dashboard, create a marketing-category template. Body: 'Hi {{1}}, ...'. Add a button (URL or quick reply). Submit. Most templates approve within 1 hour. Once approved you can reuse the template for any number of broadcasts.
Step 4 — Segment, schedule, send
Filter your audience (e.g. all contacts tagged 'D2C' in city Mumbai). Map template variables to contact fields. Schedule for later or send now. The BSP submits to Meta and reports delivery in real time. Most 5k-message broadcasts complete in under 5 minutes.
Step 5 — Monitor delivery and replies
Watch delivered, read, CTR and replies in real time. Replies land in your shared inbox (or trigger a chatbot). Anyone who taps 'Stop receiving messages' auto-opts-out. Export analytics or sync to your CRM for revenue attribution.
Frequently asked questions
How many contacts can I send a WhatsApp bulk message to?
Unlimited via the official Business API (subject to your daily tier limit, which scales from 250/day on new numbers up to unlimited).
What format does the contact list need to be in?
CSV with phone numbers in E.164 format (e.g. +919876543210), plus any name and segmentation columns you want to use in templates.
How long does it take to send a 10,000-contact broadcast?
Typically 2–10 minutes depending on Meta's rate limits and your account tier.
Will recipients see all the other contacts in the bulk send?
No. Each message is sent as an individual 1:1 conversation. Recipients see only their own chat.
Ready to put this into practice?
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