Check which numbers are on WhatsApp
Upload a list and find out which numbers actually use WhatsApp. Sending only to real WhatsApp users means fewer failures and a healthier number.
WOZTO
Example message
✅ 842 numbers are on WhatsApp ❌ 158 numbers are not Download the clean list or save it as a contact group.
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Cleaner lists, better results
Bulk check
Paste or upload a list of numbers and check them in one go.
Save the good ones
Keep only the numbers on WhatsApp as a contact group for your next campaign.
Fewer failed messages
Skipping numbers that aren't on WhatsApp keeps your delivery reports clean.
Protect your number
Lots of messages to non-WhatsApp numbers can look suspicious; checking first avoids it.
Group member export
Pull members of WhatsApp groups you're in straight into your contacts.
Also in the API
Developers can check numbers from their own software.
Get started in 3 steps
- 1
Add numbers
Paste numbers or upload a file.
- 2
Run the check
WOZTO checks each number using your connected WhatsApp.
- 3
Use the result
Save the valid numbers as a group or download them.
Frequently asked questions
Does checking send a message to the number?+
No. Checking only looks up whether the number is registered on WhatsApp; nothing is sent.
Which number formats work?+
Use numbers with the country code, for example 919876543210. 10-digit Indian numbers get +91 added automatically.
Is there a limit?+
Check in reasonable batches. Very large lists are best split into smaller parts to keep your number safe.
Try WOZTO with your own number
Create your account, connect WhatsApp with a QR scan and send your first message today.
Start free trial