01
Upload your list
Import CSV or TXT files with phone number data, then confirm the task settings before processing.
Line Checker
Verify Line account presence in bulk.
Price (per 10,000 numbers) $5 USD
Identify uploaded numbers registered on Line, the popular Asian messaging platform. Perfect for businesses targeting Asian markets through Line.
Verify Line account presence in bulk.
Price (per 10,000 numbers) $5 USD
Identify uploaded numbers registered on Line, the popular Asian messaging platform. Perfect for businesses targeting Asian markets through Line.
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.
- Asian Market Targeting: Reach users in Japan, Thailand, and beyond.
- Account Detection: Verify registered Line accounts.
- Cultural Relevance: Connect with users on their preferred platform.
- Regional Campaigns: Build Asia-focused messaging strategies.
Detection signals
What Line Checker detects
LINE is the dominant messaging app across Japan, Taiwan, and Thailand — a different regional stronghold from Zalo's Vietnam market — handling both personal chats and local business communication in those countries. LINE Checker confirms registration status without messaging the number or logging in to any account.
Registration status
Confirms whether the phone number is registered on LINE (yes or no), so you can filter out unregistered numbers before outreach.
Japan/Taiwan/Thailand market signal
A registered result flags the number as active on the leading messaging app in Japan, Taiwan, and Thailand, useful for prioritizing or segmenting outreach aimed at those East and Southeast Asian markets.
Passive, no contact
Reads registration signals only. The account holder is never messaged, logged in to, or notified.
Workflow
How Line Checker works
Use Line Checker as part of a repeatable list-cleaning workflow before outreach, CRM imports, or audience segmentation.
02
Run the check
NumberChecker.AI processes the file in bulk and returns structured status signals for each row.
03
Export segments
Download results and route clean, matched, unmatched, or review-needed rows into your next workflow.
Outputs
What you can review after the check
number
activated
Use cases
Where teams use Line Checker
List cleaning
Remove unsupported or low-confidence records before campaigns or imports.
Audience segmentation
Create groups based on platform, email, phone, or account-related signals.
Review workflows
Send uncertain or high-value records into a separate internal review queue.
Related checks
Pair Line Checker with related products
Explore checks that teams often run before or after this product.
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Validate numbering format, line type, and reachability signals before platform-specific checks
Number Active Checker
Detect phone number activity level via big-data analytics to improve SMS delivery and reduce costs
High-value Users Checker
Identify high-value phone users via big-data signals for better targeting and prioritization
E-commerce Activity Checker
Filter out numbers recently active on e-commerce platforms and reach high-converting users with real purchasing habits.
FAQ
Line Checker questions
Can I check phone numbers against LINE 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.
Does the check message 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.
Does LINE cover the same region as Zalo? +
No. LINE dominates messaging in Japan, Taiwan, and Thailand, while Zalo dominates Vietnam. The two apps serve different regional markets, so use the checker that matches the market you are targeting.
Is there a free trial? +
Yes. New accounts receive free checks on signup, and every check is pay-as-you-go with no monthly fee.
Ready to run Line Checker at scale?
Compare pricing, review API options, or create an account to upload your first production list.
