Bulk WhatsApp
Number Checker
Verify if phone numbers are active on WhatsApp in seconds. Upload a CSV or paste your list, get results instantly, export clean data. 100 free validations to start, then pay only for what you use — no subscription, credits never expire.
- 100 free validations
- CSV upload & export
- Country detection
- Real-time results
How it works
Three steps. Zero friction.
- 1
Paste or Upload
Enter numbers one per line, or drag a CSV with up to 1,000 rows. E.164 format with country code.
- 2
We Validate
Each number is checked against WhatsApp in real-time via our live session. No messages sent.
- 3
Download Results
Get a clean CSV marking active WhatsApp accounts. Import straight into your CRM or campaign.
Built for marketers, sales teams, and agencies
Clean your lead lists before the next WhatsApp blast. Cut API costs, boost deliverability, and stop messaging disconnected numbers.
Bulk CSV Upload
Drop a CSV with thousands of numbers. Batched validation runs in parallel for speed.
Global Coverage
Works for numbers from every country WhatsApp supports. Auto-detects country from prefix.
CSV Export
Download results with original number, status, and country. Ready for your CRM or blast tool.
Smart Caching
Previously checked numbers return instantly. Same list in the future? Zero re-work.
Private & Silent
We do not message the numbers. The check is passive. Recipients are never notified.
Live Progress
Watch each number get validated in real-time. Cancel anytime. Partial results still download.
AI & API Ready
Developer REST API metered by API key against your credit balance. Call it from ChatGPT, Claude, custom GPTs, or any MCP client — your 100 free credits apply here too.
View API docs →Simple pricing, no games
Other tools lock you into a monthly plan or let credits expire. We don't.
| Feature | BulkNumberChecker | Typical paid tools |
|---|---|---|
| Price | $5 per 1,000 | $10-50 per 1,000 checks |
| Free to start | 100 validations | Usually none |
| Subscription | Not required | Often required |
| Credit expiry | Never expires | Often 30-90 days |
| CSV import/export | Yes | Sometimes |
Who uses BulkNumberChecker
Marketing teams
Clean leads before every WhatsApp campaign. Cut wasted API credits on dead numbers.
Sales & outreach
Verify prospect lists before cold outreach. Skip numbers that won't receive.
Agencies
Clean client databases at scale. Deliver clean lists as a billable service.
Frequently asked questions
Quick answers. See all →
Is BulkNumberChecker really free?
Every account gets 100 free validations after signing in with Google. Beyond that, top up credits for $5 per 1,000 validations — no subscription, pay only for what you use.
How many WhatsApp numbers can I check at once?
You can check up to 1,000 phone numbers per batch via CSV upload or paste. There is no daily limit on how many batches you can run.
How does the WhatsApp number checker work?
Each phone number is queried against WhatsApp in real-time using an authenticated session. We report whether the number is registered on WhatsApp without sending any message to the recipient.
Do I need to install anything?
No. BulkNumberChecker runs entirely in your browser. No Chrome extension, no desktop app, no WhatsApp Web session required on your end.
Will WhatsApp know I checked a number?
No. The recipient receives no message, no notification, and no visible activity. The check is silent and passive.
What CSV format do I need?
A single column of phone numbers in international E.164 format (e.g. +14155551234). Country code included. One number per row, no header required.