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No-code CSV REST API Exportable results

Verify Zalo Account Registration

Check whether a phone number is registered on Zalo, Vietnam's leading messaging app.

Sign up View full pricing

3

checkers

CSV + API

bulk workflows

Zalo Checker
Zalo Days Checker
Zalo Age & Gender Checker

No account, number, or SIM required

Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.

CheckNumber's Zalo checker tells you whether a phone number is registered on Zalo, without messaging or storing the number. Upload a CSV of numbers or call the REST API, and every row comes back with a clear registered or not-registered verdict, ready to clean lists, match audiences, or route into your CRM.

What CheckNumber detects for Zalo

Zalo account by phone

Confirms whether a phone number has a registered Zalo account (yes or no).

Bulk yes/no verdict

Every number comes back with a clear registered or not-registered result, ready to filter and segment.

Passive, no contact

Reads registration signals only. The account holder is never messaged, logged in to, or notified.

What You Can Check

Pick the right Zalo signal

Choose the exact check you need for Zalo. Use upload-based batches or integrate with the same pricing through API.

Zalo Days Checker

Zalo Days Checker

NEW

Detect Zalo account activity days and last online time

Account match Live signal Export-ready
View in all products
Zalo Age & Gender Checker

Zalo Age & Gender Checker

NEW

Detect Zalo account age, gender and profile information

Account match Live signal Export-ready
View in all products

Common Use Case

Improve Zalo list quality before outreach

Qualify leads before running Zalo-based marketing in Vietnam.

No-code CSV REST API Exportable results

Signal 1

Registration check — confirm in bulk whether each phone number is a Zalo account.

Signal 2

List quality — keep only real Zalo users and drop the rest before outreach.

Signal 3

Privacy-safe — a passive check that never messages, logs in, or notifies the account holder.

Zalo FAQ

Can I check phone numbers against Zalo in bulk?

Yes. Upload a CSV of up to hundreds of thousands of numbers or call the REST API, then download a result file with a registered or not-registered verdict for every number. You are billed only for successful checks.

Do you check by phone number or email?

Zalo is checked by phone number. Upload a list of numbers and each is verified against Zalo registration.

Does the check contact or notify the person?

No. The check is passive and reads registration signals only. Nothing is sent to the number, and the account holder is never contacted or notified.

Is there a free trial?

Yes. New accounts receive 1,000 free checks on signup with no credit card, and every check is pay-as-you-go with no monthly fee, and the credits you top up never expire.

Refer & Earn 10%

Earn 10% Commission on Every Recharge — For Life

Share your unique referral link. When someone signs up through it and tops up their account, you instantly receive 10% of the amount paid as bonus credit — no expiry, no cap.

  • 10% commission on every recharge your referrals make
  • Bonus credit is applied automatically — no withdrawal steps
  • Lifetime referral link — earn forever, not just once
10%

commission per recharge

Learn how it works