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Guides•5 min read•Published: May 8, 2026

How to Send Bulk WhatsApp Messages for Free (Step-by-Step)

Stop copy-pasting announcements one by one. Here is how to automate your outreach using an Excel or CSV contact sheet and a free Chrome extension.

Whether you are coordinating a college event, updating members of a startup cohort, following up with customers, or running community announcements, copy-pasting the same message hundreds of times is tedious and prone to errors.

While WhatsApp provides official broadcast lists, they require recipients to have your number saved. For business outreach and transactional updates, a bulk messaging tool is a much more reliable solution.

In this guide, we will walk you through how to send bulk WhatsApp messages for free using **WA Sender**—a completely free and open-source Chrome extension that runs locally in your browser.

Step 1: Install the WA Sender Chrome Extension

First, you need to add the sender extension to your Google Chrome browser. WA Sender is free and does not require you to sign up, input a credit card, or set up complex Meta APIs.

  1. Go to the WA Sender Chrome Web Store Page.
  2. Click Add to Chrome and confirm the installation.
  3. Once installed, pin the extension to your Chrome toolbar for easy access.

Step 2: Prepare Your Contact Spreadsheet

The easiest way to send bulk messages is by importing your contacts from a spreadsheet. WA Sender supports both CSV and XLSX (Excel) formats.

Create a simple spreadsheet with the following columns:

  • phone: The recipient's phone number with their country code (e.g., 919876543210 or 15551234567). Do not include the + sign, spaces, or dashes.
  • name: (Optional) The recipient's name (e.g., Aarav, Sarah). This column allows you to personalize each message dynamically.
Tip: Always include the country prefix (e.g., 91 for India, 1 for the USA) in front of the numbers. If your Excel sheet drops the leading zero or prefix, WA Sender can automatically append a default country prefix from the settings.

Step 3: Draft Your Personalized Message Template

Personalized messages feel much more natural and have higher response rates. With WA Sender, you can insert dynamic variables based on your spreadsheet columns.

Write your template using the double-curly brace syntax:

Hi {{Name}}, 

Here is a quick update regarding your registration for tomorrow's event. Please make sure to bring your confirmation QR code. 

See you there!

When the queue runs, the extension automatically replaces {{Name}} with the name from the corresponding row of your spreadsheet. If a contact has no name, it will leave the greeting blank or fallback gracefully.

Step 4: Import Contacts and Start the Queue

Now you are ready to start sending:

  1. Open a tab with WhatsApp Web (web.whatsapp.com) and make sure you are logged in.
  2. Click the **WA Sender icon** in your extensions bar to open the popup.
  3. Under the text area, click Upload CSV/XLSX and select your contact spreadsheet. Alternatively, you can copy and paste numbers directly.
  4. Write your message template in the main text box.
  5. Click Send.

The extension will open the chats one by one, resolve the template variables, and send the messages on your behalf. You can monitor progress live inside the popup.

Anti-Ban Pacing: Sending messages too fast can flag your account on WhatsApp. Before sending to large lists, go to settings and make sure to configure a random delay (e.g., 6 to 15 seconds between messages) and batch pauses (e.g., pause for 30 seconds after every 15 messages) to mimic human behavior.

Conclusion

Sending bulk WhatsApp messages does not require expensive software or complex integrations. By combining WhatsApp Web with a local, open-source tool like WA Sender, you can execute your outreach efficiently and safely.

Remember to use bulk sending responsibly, respect opt-outs, and keep your communication relevant to your audience.