How to Extract All Contacts from a WhatsApp Group (Only Phone Numbers) with KorpDeck

In the era of digital marketing and data intelligence, having access to relevant information is a crucial competitive advantage. In this sense, WhatsApp has become one of the most valuable channels for businesses, entrepreneurs, and market analysts, thanks to its global reach and high level of direct interaction between users.

However, finding a secure, automated, and privacy-respecting way to obtain public WhatsApp data isn’t always easy. This is where KorpDeck comes in — a platform specifically designed to facilitate the extraction of publicly available information from social networks, including WhatsApp, in a structured, legal, and scalable way.

In this article, we’ll explain how you can extract all the phone numbers of participants in a public WhatsApp group, identify which country they belong to, and download them in CSV format using the browser extension provided by KorpDeck.

What Can You Do with KorpDeck on WhatsApp?

KorpDeck offers powerful and accurate functionality for those who want to work with transparently obtained data from public WhatsApp groups:

• 📱 Extraction of phone numbers from all group participants.
• 🌍 Automatic country identification based on the number’s prefix.
• 📥 Download data in CSV format for immediate use in marketing campaigns, CRM, or research.
• 🔐 All under principles of privacy and transparency, accessing only publicly available information.

It’s important to note that KorpDeck does not violate any WhatsApp policy, as it only accesses information visible in public groups and requires you to be an active member. It does not store or process personal names or conversations. This makes it an ideal tool for professionals looking to scale market research, business prospecting, or clean database building.

Step-by-Step: How to Use KorpDeck to Extract Phone Numbers from WhatsApp Groups

✅ Prerequisites

Before you begin, make sure you meet these requirements:

• Have a registered account at KorpDeck
• Have access to a public WhatsApp Web group
• Have the official Chrome extension of KorpDeck installed

Note: This process only works with public groups where you are an active member.

1. Installing the KorpDeck Extension in Google Chrome

The KorpDeck extension is available on the Chrome Web Store and is designed to seamlessly integrate with WhatsApp Web. Its operation is fully secure and doesn’t require additional permissions beyond the minimum needed to interact with WhatsApp Web.

Steps:

1. Go to the KorpDeck WhatsApp extension page.
2. Click “Install extension”.
3. Confirm installation in Chrome.
4. Once installed, open web.whatsapp.com.

The extension will automatically appear on screen when you open a chat or group. If you don’t see the interface, click the extension icon in the top toolbar of your browser.

2. Accessing a Public WhatsApp Group

Once inside WhatsApp Web, select the group from which you want to extract numbers. Remember that you can only do this in groups where you’re a member and that are set to public.

Inside the group, you’ll see:

• The group name
• The description (if available)
• The list of participants

When you open the group window, the KorpDeck extension will activate automatically, displaying an action button that says:
“Extract numbers from this group”

Click it to start the data collection process.

3. Automated Extraction of Phone Numbers

Once started, KorpDeck begins to go through the group participant list in a controlled and natural way, avoiding suspicious patterns that could trigger blocks.

During this process, the extension does the following:

• Retrieves each visible phone number in the participant list.
• Removes duplicates and invalid numbers.
• Identifies the international prefix of each number to determine its origin country.
• Temporarily stores encrypted data locally before sending it to your KorpDeck account.

This process may take between 30 seconds and 2 minutes, depending on the group size (approximately 50 to 1000 participants). You don’t need to keep the connection open the entire time, although it’s recommended to avoid interruptions.

4. Viewing Data in the KorpDeck Platform

Once the extraction is complete, the data is automatically synchronized with your KorpDeck account. Here you can:

• View the total number of extracted numbers
• Consult the detailed list of phone numbers
• See the country associated with each number
• Filter by country, region, or number validity status
• Download the data in CSV format ready for use in Excel, Mailchimp, Google Sheets, or other management systems.

Additionally, KorpDeck allows you to organize this data into custom folders or categories, ideal for those conducting multiple extractions across different sectors or industries.

5. How Does Country Identification Work?

One of the most useful features of KorpDeck is its ability to automatically detect the country of each extracted phone number. This is done by analyzing the international prefix of each number.

For example:

• A number starting with +52 corresponds to Mexico
• One starting with +34 corresponds to Spain
• And one starting with +1 likely belongs to the United States or Canada

This functionality makes it easy to segment contacts by geographic location, which is essential for:

• Regionalized advertising campaigns
• Audience analysis by country
• Exporting segmented leads

All of this is done automatically, without manual intervention, saving hours of post-processing work.

6. Downloading the CSV File with Structured Information

Once the extraction and classification process is complete, KorpDeck lets you download all the information in CSV format. This file contains the following columns:

This file is compatible with:

• Microsoft Excel
• Google Sheets
• Email marketing tools (Mailchimp, Brevo, HubSpot)
• Databases (Google BigQuery, Airtable, Notion)
• CRM systems (Zoho, Salesforce)

7. Common Use Cases for This Feature

🧑‍💼 Digital Marketing

Local service companies can identify which regions have more participation in topic-based groups and create targeted marketing strategies for specific countries or languages.

📊 Market Research

Analysts and researchers can compare the geographical distribution of users in different WhatsApp groups, helping them understand interest trends, competition, or demand.

🚀 Commercial Prospecting

Salespeople and sales teams use this feature to build qualified contact lists based on demonstrable interests (e.g., entrepreneurship, digital marketing, technology).

📈 Clean Database Building

Companies working with partners, influencers, or international providers can generate real contact lists organized by country and ready to import into their automation tools.

8. Why Use KorpDeck Instead of Other Alternatives?

Many people try manual solutions or homemade scripts to extract WhatsApp contacts, but these come with several risks:

• Risk of being blocked by WhatsApp
• Lack of accuracy in country identification
• Difficulty exporting data to usable formats
• No cloud backup or extraction history

With KorpDeck, you get:

• Visual and intuitive interface
• Automated and secure process
• CSV export ready to use
• Automatic country identification
• Integration with your current workflows

Plus, the entire process runs from your own browser, without storing sensitive or personalized data like user names.

9. Practical Example: Extracting Numbers from a Mexican Entrepreneurship WhatsApp Group

Imagine you’re a digital marketing consultant in LATAM and want to identify collaboration opportunities with Mexican entrepreneurs. You find a public group called “Digital Entrepreneurs MX” and decide to extract the visible phone numbers from that group.

Step-by-step process:

1. Log in to WhatsApp Web.
2. Open the “Digital Entrepreneurs MX” group.
3. Click the KorpDeck button that appears in the group window.
4. The extraction process starts.
5. After a few moments, the system displays a message: “127 valid phone numbers found.”
6. Go to your KorpDeck account and review the data.
7. Apply filters by country and download the CSV file containing all the Mexican numbers.

Now you have a clean list of Mexican digital entrepreneurs, ready to use in WhatsApp Business campaigns, email outreach, or mass SMS platforms.

10. Best Practices and Ethics When Using KorpDeck

As with any data extraction tool, it’s fundamental to follow best practices:

✅ What You Should Do:

• Only extract data from public groups where you’re an active member
• Respect privacy regulations and explicit consent policies
• Use the data exclusively for legitimate commercial purposes

❌ What You Should NOT Do:

• Don’t use KorpDeck to extract data from private groups
• Don’t share or sell collected data without proper consent
• Don’t perform repetitive extractions that could overload the service

KorpDeck is designed to facilitate responsible access to public information, not for intrusive or illegal activities.

11. Main Advantages of Using KorpDeck for WhatsApp

12. How Accurate Is the Country Detection?

Country identification is based on the international prefix of the phone number, which is highly reliable if numbers are correctly formatted.

Examples of prefix mapping:

• +52 → Mexico
• +34 → Spain
• +57 → Colombia
• +54 → Argentina
• +1 → United States / Canada

If the number lacks a prefix or is incomplete, KorpDeck marks it as not identifiable to avoid incorrect assumptions.

13. Conclusion: Scan, Save, and Use Your WhatsApp Contacts Professionally

With KorpDeck, it’s now possible to extract phone numbers from any public WhatsApp group, automatically identify their country of origin, and export them in a ready-to-use format for your marketing, research, or business projects.

You don’t need to program anything, no advanced technical skills, and no manual contact saving. Just install the extension, select the group, and let KorpDeck do the rest.

Ready to start?
Sign up at KorpDeck and try the extension for free today.

Frequently Asked Questions

❓ Can I also extract participant names?

No. For privacy and data protection reasons, KorpDeck only collects phone numbers and does not store or process user names.

❓ Does it work with private WhatsApp groups?

No. KorpDeck only allows data extraction from public groups visible to you as a group member.

❓ Are the data stored permanently in the cloud?

Yes, your data is stored on secure and encrypted servers. You can delete it anytime from your dashboard.

❓ Can I run the extraction again to update the group data?

Yes, you can repeat the extraction as many times as you want. KorpDeck will show historical versions of each extraction, allowing you to track changes over time.

❓ Do I need to keep WhatsApp Web open during the entire process?

Yes, just like any web scraping tool, it requires access to the target site. However, the process is fast and doesn’t require continuous connection throughout the day.